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Diaz, Rosemary Teresa. "Multifunction lidar". Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1679292501&sid=3&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Pełny tekst źródłaVandermeer, Aaron D. "Lidar measurements of tropospheric aerosol from the Lidar In-space Technology Experiment". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq43408.pdf.
Pełny tekst źródłaFava, Marica. "LIDAR Aviotrasportati Mediante RPAS". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Znajdź pełny tekst źródłaHelt, Michael F. "Vegetation identification with Lidar". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FHelt.pdf.
Pełny tekst źródłaAlmqvist, Erik. "Airborne mapping using LIDAR". Thesis, Linköping University, Automatic Control, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58866.
Pełny tekst źródłaMapping is a central and common task in robotics research. Building an accurate map without human assistance provides several applications such as space missions, search and rescue, surveillance and can be used in dangerous areas. One application for robotic mapping is to measure changes in terrain volume. In Sweden there are over a hundred landfills that are regulated by laws that says that the growth of the landfill has to be measured at least once a year.
In this thesis, a preliminary study of methods for measuring terrain volume by the use of an Unmanned Aerial Vehicle (UAV) and a Light Detection And Ranging (LIDAR) sensor is done. Different techniques are tested, including data merging strategies and regression techniques by the use of Gaussian Processes. In the absence of real flight scenario data, an industrial robot has been used fordata acquisition. The result of the experiment was successful in measuring thevolume difference between scenarios in relation to the resolution of the LIDAR. However, for more accurate volume measurements and better evaluation of the algorithms, a better LIDAR is needed.
Kartering är ett centralt och vanligt förekommande problem inom robotik. Att bygga en korrekt karta av en robots omgivning utan mänsklig hjälp har en mängd tänkbara användningsområden. Exempel på sådana är rymduppdrag, räddningsoperationer,övervakning och användning i områden som är farliga för människor. En tillämpning för robotkartering är att mäta volymökning hos terräng över tiden. I Sverige finns det över hundra soptippar, och dessa soptippar är reglerade av lagar som säger att man måste mäta soptippens volymökning minst en gång om året.
I detta exjobb görs en undersökning av möjligheterna att göra dessa volymberäkningarmed hjälp av obemannade helikoptrar utrustade med en Light Detectionand Ranging (LIDAR) sensor. Olika tekniker har testats, både tekniker som slår ihop LIDAR data till en karta och regressionstekniker baserade på Gauss Processer. I avsaknad av data inspelad med riktig helikopter har ett experiment med en industri robot genomförts för att samla in data. Resultaten av volymmätningarnavar goda i förhållande till LIDAR-sensorns upplösning. För att få bättre volymmätningaroch bättre utvärderingar av de olika algoritmerna är en bättre LIDAR-sensor nödvändig.
Opitz, Rachel Shira. "Lidar analysis for archaeology". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611795.
Pełny tekst źródłaKim, Angela M. "Simulating full-waveform LIDAR". Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FKim.pdf.
Pełny tekst źródłaThesis Advisor(s): Borges, Carlos F. ; Olsen, Richard C. "September 2009." Description based on title screen as viewed on 6 November 2009. Author(s) subject terms: LIDAR, Monte Carlo simulation, full-waveform, model. Includes bibliographical references (p. 105-108). Also available in print.
Hedlund, Marcus. "Weather Influence on LiDAR Signals using the Transient Radiative Transfer and LiDAR Equations". Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79945.
Pełny tekst źródłaEdvinsson, Lisette. "Analys av vinddata från lidar". Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172353.
Pełny tekst źródłaStaffas, Theodor. "Live 3D imaging quantum LiDAR". Thesis, KTH, Tillämpad fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297865.
Pełny tekst źródłaI detta projekt demonstrerar jag ett enstaka foton Light Detection And Ranging,(LiDAR) system som använder ljus med 1550 nm våglängd som är ofarliga för ögon.Systemet kan återskapa 3D miljöer i realtid med 400 punkter per sekund med mmprecision. Systemet är byggt med kommersiellt tillgängliga komponenter och all dataanalys utfördes med opensource mjukvaran ETA. Jag använder en superconductingnanowire single photon detector, (SNSPD) med 19 ps timing jitter och 85 % effektivitetför att uppnå en precision på 4 ps i mätningarna. Jag visar också att genom utföramer tidskrävande postanalys av datan så är det möjligt att öka upplösningen ochjämnheten i bilderna. Utöver detta visar jag att samma LiDAR system och algoritmer kan användas för attutföra Optical Time Domain reflectrometry, (OTDR) mätningar. Jag visar att systemetkan urskilja olika reflektioner från fiber till fiber och fiber till luft kopplingar. Med hjälpav dessa reflektioner visar jag också att det är möjligt att identifiera brister i optiskafiber samt mäta olika egenskaper av fibern som absorbtions koeffcient eller termiskkontraktion. Slutligen visar jag att samma principer av OTDR som används i fiber kantillämpas till free-space optiska system och att det är möjligt att identifera olika optiskaelement samt bedömma linjeringen av det optiska systemet.
Agarwal, Megha, Alisha Bandekar, Ashley Kang, Tyler Martis, Hossein Namazyfard, Alan Yeh, Megha Agarwal i in. "Automotive LiDAR Collision-Avoidance System". Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624893.
Pełny tekst źródłaNIANG, DJIBRIL. "Performance evaluation of LIDAR demonstrator". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/404777.
Pełny tekst źródłaIn our three years of work, we have achieved the realization of a Firing unit board with the GaN and driver in a system in package. Three different boards were realized: A first board with only the resistor, the second one with the resistor and a shunt resistor and a third board with the laser diode and a shunt resistor. A DC-DC was realized for the supply while a control unit was realized for the control of the input signals of the driver.Unfortunately, no measurements of the firing unit have been done yet as we are still waiting for the chip to be completed. The DC-DC and the control unit board have been measured and tested. LIDAR application is the most attractive and efficient solution for this market. The challenges of LIDAR application consist in the development of the electronics generating a current pulse of 50A that lasts for less than 5ns. The technical area of this activity is fully autonomous self-driving car, and in particular what helps an autonomous vehicle to understand the world around it.
Royer, Philippe. "Lidars à rétrodiffusion Rayleigh-Mie et Raman mobiles pour l’étude des cycles couplés des aérosols et de la vapeur d’eau". Paris 6, 2011. http://www.theses.fr/2011PA066576.
Pełny tekst źródłaKlein, Céline. "Conception et prototypage d’un lidar pour la mesure du contenu en eau liquide dans le brouillard". Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2013INPT0094/document.
Pełny tekst źródłaThe objective of the present study is the design of a lidar for the measurement of vertical profiles of liquid water content in fogs. Presently, there is no system able to measure such profile. The liquid water content is measured at ground or at limited number of altitudes. Yet, the information would improve our understanding of fog processes and provide valuable data for controlling fog forecast models. Its feasibility is theoretically possible because it was shown in the late 70s that the liquid water content and the optical extinction at 11μm are empirically linked by a linear relationship. My first objective was to test this relationship with rencent observations more precise than in the late 70s. The relationship is confirmed within limits that I tried to determine. The vertical extension of fogs is several hundreds of meters. We thus need a lidar with a maximum range of several meters. I compared the range of a direct versus a heterodyne lidar and I found the heterodyne lidar is more appropriate. I have developed analytic approximations of the heterodyne efficiency for several transmitter configurations - monostatic, bistatic with parallel or non-parallel axes - and found the monostatic configuration gives the best results at short range. I coded a simulator for the lidar and showed the retrieval of the extinction coefficient from lidar signals with the usual signal processing technique produces biases at short range. I proposed and validated a correction scheme. I derived two analytic approximations for the bias and the standard deviation of the estimations of the extinction coefficient. They were used to estimate the practical range and accuracy a lidar can achieve for the measurement of the liquid water content in fogs
Landgård, Jonas. "Segmentering och klassificering av LiDAR-data". Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5555.
Pełny tekst źródłaWith numerous applications in both military and civilian life, the demand for accurate 3D models of real world environments increases rapidly. Using an airborne laser scanner for the raw data acquisition and robust methods for data processing, the researchers at the Swedish Defence Research Agency (FOI) in Linköping hope to fully automate the modeling process.
The work of this thesis has mainly been focused on three areas: ground estimation, image segmentation and classification. Procedures have in each of these areas been developed, leading to a new algorithm for ground estimation, a number of segmentation methods as well as a full comparison of various decision values for an object based classification. The ground estimation algorithm developed has yielded good results compared to the method based on active contours previously elaborated at FOI. The computational effort needed by the new method has been greatly reduced compared to the former, as performance, particularly in urban areas, has been improved. The segmentation methods introduced have shown promising results in separating different types of objects. A new set of decision values and descriptors for the object based classifier has been suggested, which, according to tests, prove to be more efficient than the set p reviously used.
Med många tillämpningar både inom det civila och militära, ökar efterfrågan på noggranna och korrekta omvärldesmodeller snabbt. Forskare på FOI, Totalförsvarets Forskningsinstitut, arbetar med att fullt ut kunna automatisera den process som genererar dessa tredimensionella modeller av verkliga miljöer. En luftburen laserradar används för datainsamlingen och robusta metoder är under ständig utveckling för den efterföljande databehandlingen.
Arbetet som presenteras i denna rapport kan delas in i tre huvudområden: skattning av markyta, segmentering av data samt klassificering. Metoder inom varje område har utvecklats vilket lett fram till en ny algoritm för markestimering, en rad metoder för segmentering samt en noggrann jämförelse av olika beslutsvärden för en objektbaserad klassificering. Markskattningsalgoritmen har visat sig vara effektiv i jämförelse med en metod baserad på aktiva konturer som sedan tidigare utvecklats på FOI. Beräkningsbördan för den nya metoden är endast en bråkdel av den förra, samtidigt som prestandan, särskilt i urbana miljöer, har kunnat förbättras.
De segmenteringsmetoder som introducerats har visat på lovande resultat vad gäller möjligheten att särskilja olika typer av objekt. Slutligen har en ny uppsättning deskriptorer och beslutsvärden till den objektbaserade klassificeraren föreslagits. Den har enligt de tester som presenteras i rapporten visats sig vara mer effektiv än den uppsättning som använts fram till idag.
Nathanson, Marcus. "Using LiDAR to model rating curves". Licentiate thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-84292.
Pełny tekst źródłaDeMello, John E. "Low-cost direct detect spaceborne LIDAR". Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42606.
Pełny tekst źródłaLIDAR has widely been used to create very accurate 3-D models for use in a wide range of commercial, governmental and nonprofit applications. This thesis identifies how recent advancements in Nd:YAG fiber lasers and InGaAs GmAPDs could be applied to space-borne missions, enabling low-cost solutions that fulfill NASA’s ICESat-2 and United States Geological Survey (USGS) objectives. An analysis of launch vehicles, standard spacecraft buses and payload technologies identified three potential low-cost solutions: one hosted aboard Iridium and two onboard a BCP2000 commercial bus. These systems were evaluated using NASA’s mass-based and aperture-based cost models to provide a rough estimate of cost versus NASA’s CALIPSO, ICESat-1 and ICESat-2 missions. Preliminary analysis shows a potential for these new technologies to outperform any previous space-based LIDAR mission. At $55M, the Iridium-hosted solution is 1/16th the cost of ICESat-2 at roughly one-third its capability. Two other solutions were estimated at $216.6M and $370.586M and provided over 3X and 10X the estimated capability of ICESat-2, respectively. Both systems are anticipated to fulfill NASA’s ice sheet and vegetation objectives while delivering a return on investment of roughly $1B per year based on USGS’s analysis of advanced 3-D data for the United States.
Mueller, Amanda R. "LiDAR and image point cloud comparison". Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/43960.
Pełny tekst źródłaThis paper analyzes new techniques used to extract 3D point clouds from airborne and satellite electro-optical data. The objective of this research was to compare the three types of point clouds to determine whether image point clouds could compete with the accuracy of LiDAR point clouds. The two main types of image point clouds are those created photogrammetrically, with two side-by-side images, or through feature matching between multiple images using multiview stereo techniques. Two software packages known for handling aerial imagery, IMAGINE Photogrammetry and Agisoft Photoscan Pro, were used to create such models. They were also tested with sub-meter resolution satellite imagery to determine whether much larger, but still truthful, models could be produced. It was found that neither software package is equipped to vertically analyze satellite imagery but both were successful when applied to aerial imagery. The photogrammetry model contained fewer points than the multiview model but maintained building shape better. While the photogrammetry model was determined to be the more accurate of the two it still did not compare to the accuracy of the LiDAR data.
Morley, Richard James. "RF excited CO2 amplifiers for lidar". Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1484.
Pełny tekst źródłaO'Connor, Ewan James. "Lidar and radar studies of stratocumulus". Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412197.
Pełny tekst źródłaGibbons, Jasper, i David Moss. "LIDAR OUTGOING LASER ENERGY MEASUREMENT SYSTEM". International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605772.
Pełny tekst źródłaA flexible system has been designed to accurately measure and average the outgoing laser energy of a micro-pulse LIDAR unit (MPL). This system incorporates specifically designed analog measurement circuitry interfaced with a microcontroller, allowing researchers to manage experiments from a personal computer. The final system produces a linearly proportional response between an incident laser energy input and the analog and digital circuitry’s output, accurate to within 0.1%. Custom designed algorithms allow the system to average the energy measured in a series of pulses. Each series can range on the order of tens of thousands of pulses.
Amaglo, Worlanyo Yao. "Volume Calculation Based on LiDAR Data". Thesis, KTH, Fastigheter och byggande, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299594.
Pełny tekst źródłaI detta avhandlingsprojekt var huvudmålet att jämföra och utvärdera tre kartläggningsmetoder för volymbestämning: Fotogrammetri, Terrestrial Laser Scanning (TLS) och Aerial Laser Scan-ning (ALS) baserat på tidsförbrukning, effektivitet och säkerhet i gruvindustrin. Dessutom formulerades en volymetrisk beräkningsmetod baserad på koordinater för att uppskatta volymen av lager med hjälp av lidardata som fångats med en laserskanner. Användningen av GNSS-mottagare, UAV (obemannad flygbil) utrustad med en LiDAR-sensor samt en kamera och markbunden laserscanner antogs för att göra mätningar på lager. Trimble Business Center och Trimble RealWorks användes vid bearbetning av LiDAR-data från TLS och ALS. Två volymberäkningsmetoder undersöktes också med både TLS- och ALS LiDAR-data. Agisoft Photoscan användes vid bearbetning av de bilder som tagits och antagit strukturen från rörelseprincipen. Denna programvara användes för att uppskatta volymen på lagret. Matlab användes för att uppskatta volymen av lager med LiDAR-data. En volymberäkningsmetod baserad på koordinater för punktmoln implementerades i Matlab. Analys baserad på den tid det tar att fånga och bearbeta alla datatyper tills den slutliga produkten var klar. Resultaten från varje datafångstmetod utvärderades. Simulerad datateknik antas också i detta projekt eftersom den kan modelleras på olika sätt för att studera effekten av ytjämnhet (punkttäthet) på den uppskattade volymen. En del av detta projekt utforskar användningen av MATLAB för att filtrera bort oönskade punktmoln som kommer från ogräset som växer på ytan av ett övergivet lager och även ytarealer som skulle uteslutas från volymberäkningen, som i detta fall. Från de erhållna resultaten skiljer sig TLS och ALS inte mycket i de slutliga volymuppskattningarna. Fotogrammetri å andra sidan uppskattade en högre volym jämfört med de andra undersöknings-metoderna. MATLAB vid uppskattning av lagervolymen uppnår ungefär lika stor uppskattning som TLS och ALS inom en kort tidsperiod. Punkttätheten och filtreringsalgoritmen spelar en viktig roll i volymberäkning som hjälper till att ge en bra uppskattning av lagret. Resultat från detta projekt visar att det är tidskrävande att uppskatta lagervolymen med TLS och fotogram-metrisk metod. När det gäller säkerhet på en aktiv gruvplats har dessa två undersökningsmetoder hög risk sannolikhet jämfört med ALS-metoden. Noggrannheten för de insamlade och bearbetade uppgifterna kan sägas vara tillfredsställande för varje undersökningsmetod.
Gast, David W. "LIDAR design for space situational awareness". Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FGast.pdf.
Pełny tekst źródłaThesis Advisor(s): Agrawal, Brij N. ; Boger, Dan C. "September 2008." Description based on title screen as viewed on November 3, 2008. Includes bibliographical references (p. 79-80). Also available in print.
Arvidsson, Simon, i Marcus Gullstrand. "Classifying natural forests using LiDAR data". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Datateknik och informatik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45267.
Pełny tekst źródłaChester, David B. "A Parameterized Simulation of Doppler Lidar". DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6794.
Pełny tekst źródłaNava, Chocron Yoshua. "Visual-LiDAR SLAM with loop closure". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265532.
Pełny tekst źródłaSpjutspetsen inom Lidar-baserade teknik för fordonsodometri har den senaste tiden uppnått exceptionella nivåer av noggrannhet. Med det sagt har de metoder som presenterats fokuserat på att lösa lokaliseringsproblemet och därför gjort förenklande antaganden såsom att de sköter kartläggning av miljön löpande utan platsåterkoppling, och att de inte kan återlokalisera i tidigare kända miljöer. Således utvecklar vi i detta arbete ett system som kombinerar dessa noggranna lidarodometriska tekniker med algoritmer för platsigenkänning för att möjliggöra loopdetektion. Vi använder vitt tillgängliga dataset av körning i stadstrafik samt i utomhusområden för utveckling och utvärdering av systemet. Resultaten visar att platsåterkoppling förbättrar noggrannheten hos Lidar-baserade lokaliseringsmetoder och gör dem mer robusta, samt att man med hjälp av detektorer baserade på punktmolnssegmentering och visuella särdrag erhåller ett system som uppvisar mycket goda resultat under utvärderingsfasen.
Argall, Philip Stephen. "Lidar studies of the middle atmosphere /". Title page, table of contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09pha686.pdf.
Pełny tekst źródłaCosta, Renata Facundes da. "Estudo das propriedades ópticas dos aerossóis no Estado de São Paulo com a técnica de LIDAR Raman". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-05112010-183928/.
Pełny tekst źródłaThe investigation reported in this dissertation has been divided in two parts. The first part was made to carry out an independent calibration of a Raman lidar system for water vapor in the CLA installed using a methodology that was developed at Howard University, based on a careful analysis of the efficiency of the optical system components aimed at determining the efficiency and displaying the spectral response of the system. After this study, which led to a better understanding of the field of instrumental system, the second part, presents a preliminary study of the optical properties of aerosols in the troposphere by evaluating parameters such as, for example, the vertical proles of aerosol extinction, SR and LR, using a mobile Raman LIDAR system developed by Raymetrics Lidar Systems, during campaigns conducted in some research institutes in the State of São Paulo.
Alem, Nour. "Développement de l'émetteur hyperfréquence d'un système Lidar-Radar pour des applications optiques marines". Thesis, Brest, 2019. http://www.theses.fr/2019BRES0013/document.
Pełny tekst źródłaThe Lidar Radar technique is commonly used for submerged target detection in shallow waters less than a few tens of meters. This technique is based on sending a modulated signal, associated with a bandpass filter around the modulation frequency after detection. This technique requires an intense blue-green optical signal modulated at radar frequencies. We present in this thesis new modulator architectures perfectly adapted to this technique. The first architecture consists of an external cavity with an intracavity SHG stage. This architecture is coupled to an infrared picosecond laser source (1064 nm). The results showed that this modulator makes it possible to generate a green signal (532 nm), intense (5 mJ) and stable in frequency. Thanks to the source used, the signal modulated at the output of the transmitter (laser source and modulator) lasts only a few nanoseconds. This makes it possible to use the "range-gating" method to precisely locate the target.Nevertheless, this device has the disadvantage of a fixed bandwidth. We have therefore developed a second architecture of the modulator, allowing to easily tune the bandwidth of the transmitted signal. This configuration is based on the polarimetric behavior of the optical components in order to change the bandwidth of the signal. We have shown that this modulator can deliver , an intense signal (up to 2.9 mJ), short (a few nanoseconds), at 532 nm, modulated at mirowave frequencies, stable in frequency and tunable in bandwidth
Braña, Isaac. "Turbine-Mounted Lidar:The pulsed lidar as a reliable alternative". Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-217020.
Pełny tekst źródłaSeldomridge, Nathan Lewis. "Dual-polarization cloud lidar design and characterization". Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/seldomridge/SeldomridgeN0805.pdf.
Pełny tekst źródłaKiemle, Christoph. "Airborne water vapor lidar measurements : 14 Tabellen /". Köln : DLR, Bibliotheks- und Informationswesen, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016794181&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Pełny tekst źródłaGregorio, López Eduard. "Lidar remote sensing of pesticide spray drift". Doctoral thesis, Universitat de Lleida, 2012. http://hdl.handle.net/10803/96788.
Pełny tekst źródłaEn esta tesis doctoral se propone utilizar la técnica LIDAR (LIght Detection And Ranging) para monitorizar la deriva de pesticidas. A diferencia de los colectores in situ, esta técnica permite medir los aerosoles de forma remota, con elevada resolución temporal y en distancia. Los objetivos de esta tesis son (1) diseñar un sistema lidar específico para la medida de la deriva y (2) evaluar la capacidad de esta técnica para cuantificar la concentración en las plumas de pesticidas. Para la consecución del objetivo (1) se ha elaborado una metodología de diseño, validada mediante la construcción de un prototipo de ceilómetro lidar biaxial. Partiendo de esta metodología se han establecido los parámetros de diseño del sistema lidar específico para medir la deriva: longitud de onda de 1550 nm, energía por pulso igual a 25 μJ, etc. Respecto al objetivo (2), se propone un modelo teórico que relaciona las medidas lidar de la deriva con las obtenidas utilizando colectores pasivos. La relación entre ambos tipos de sensores también ha sido estudiada experimentalmente. Las medidas mostraron que para cada ensayo existe una elevada correlación lineal (R2≈0.9) entre la señal lidar y los colectores.
This doctoral thesis proposes the use of the LIDAR (LIght Detection And Ranging) technique for spray drift monitoring. Unlike in situ collectors, this technique enables remote measurement of aerosols with high temporal and range resolution. The objectives of this thesis are as follows: (1) the design of a lidar system specifically for the remote sensing of pesticide spray drift and (2) assessment of the capacity of lidar technology to quantify droplet concentration in drift clouds. For the purposes of objective (1), a design methodology was elaborated. This methodology was validated with the construction of a biaxial lidar ceilometer prototype. Taking this methodology as a starting point the design parameters of a lidar system specifically for spray drift measurement were established: 1550 nm wavelength, 25 μJ de pulse energy, etc. As for objective (2), it is proposed a quantitative analytical model which relates the lidar spray drift measurements with those obtained using passive collectors. The relationship between the two sensor types was also studied experimentally. The measurements showed that for each test there is a high linear correlation (R2≈0.9) between the lidar signal and the collectors
Lampert, Astrid. "Airborne lidar observations of tropospheric arctic clouds". Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4121/.
Pełny tekst źródłaDie Arktis mit ihren speziellen Umweltbedingungen ist besonders empfindlich gegenüber Klimaveränderungen. Dabei spielen Wolken eine große Rolle im Strahlungsgleichgewicht, die aber nur schwer genau bestimmt und in Klimamodellen dargestellt werden kann. Die Daten für die Promotionsarbeit wurden im Frühjahr 2007 bei Flugzeug-Messungen von Wolken über dem Arktischen Ozean von Spitzbergen aus erhoben. Das dafür verwendete Lidar (Licht-Radar) des Alfred-Wegener-Instituts lieferte ein höhenaufgelöstes Bild der Wolkenstrukturen und ihrer Streu-Eigenschaften, andere Messgeräte ergänzten optische sowie mikrophysikalische Eigenschaften der Wolkenteilchen (Extinktion, Größenverteilung, Form, Konzentration, Flüssigwasser- und Eisgehalt, Messgeräte vom Laboratoire de Météorologie Physique, France) und Strahlungsmessungen (Uni Mainz). Während der Messkampagne herrschte Nordwind vor. Die untersuchten Luftmassen mit Ursprung fern von menschlichen Verschmutzungsquellen war daher sehr sauber. Beim Überströmen der kalten Luft über den offenen warmen Arktischen Ozean bildeten sich in der Grenzschicht (ca. 0-1500 m Höhe) Mischphasenwolken, die aus unterkühlten Wassertröpfchen im oberen Bereich und Eis im unteren Bereich der Wolken bestehen. Mit den Flugzeug-Messungen und numerischen Simulationen des Strahlungstransports wurde der Effekt einer dünnen Eiswolke auf den Strahlungshaushalt bestimmt. Die Wolke hatte lokal eine geringe Abkühlung der Erdoberfläche zur Folge. Ähnliche Wolken würden jedoch im Winter, wenn keine Sonnenstrahlung die Arktis erreicht, durch den Treibhauseffekt eine nicht vernachlässigbare Erwärmung der Oberfläche verursachen. Die Messungen der Mischphasenwolken wurden mit einem Wettervorhersagemodell (ECMWF) verglichen. Für die ständig neue Bildung von flüssigen Wassertropfen im oberen Teil der Wolke ist das Aufsteigen von feuchten Luftpaketen nötig. Während einer Messung wurden entlang der Flugstrecke verschiedene Luftmassen durchflogen. An der Luftmassengrenze wurde eine reine Eiswolke inmitten eines Mischphasen-Systems beobachtet. Die Messungen zeigen, dass das Mischen von Luftmassen den Nachschub an feuchter Luft blockiert, was unmittelbare Auswirkungen auf die thermodynamische Phase des Wolkenwassers hat. Weiterhin wurde bestimmt, wie groß die Abweichungen der Modellrechnungen von den Messungen bezüglich Wassergehalt und der Verteilung von Flüssigwasser und Eis waren. Durch die vereinfachte Wolken-Parameterisierung wurde die typische vertikale Struktur von Mischphasenwolken im Modell nicht wiedergegeben. Die flugzeuggetragenen Lidar-Messungen vom 9. April 2007 wurden mit Lidar-Messungen an Bord des Satelliten CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) verglichen. Die Messungen zeigten beide eine ansteigende Wolkenobergrenze entlang desselben Flugwegs. Da die Messungen jedoch nicht genau gleichzeitig durchgeführt wurden, war wegen Advektion und Prozessen in den Wolken kein genauer Vergleich der kleinskaligen Wolkenstrukturen möglich. Außerdem wurde eine doppelte Wolkenschicht in der freien Troposphäre (4 km Höhe) analysiert. Die Wolke bestand aus zwei separaten dünnen Schichten aus flüssigem Wasser (je 150 m dick) mit jeweils Eis darunter. Die untere Schicht entstand wahrscheinlich aus verdunstetem Eis-Niederschlag. Diese feuchte Schicht wurde durch die Abstrahlung der oberen Wolkenschicht gekühlt, so dass sie wieder kondensierte. Solche Wolkenformationen sind in der Arktis bisher vor allem in der Grenzschicht bekannt. Ein einzigartiger Datensatz von arktischen Wolken wurde mit einer Kombination verschiedener Flugzeug-Messgeräte erhoben. Zusammen mit meteorologischen Analysen konnten für verschiedene Fallstudien Wolkeneigenschaften, Entwicklungsprozesse und Auswirkungen auf den Strahlungshaushalt bestimmt werden.
Wasell, Richard. "Automatisk detektering av diken i LiDAR-data". Thesis, Linköpings universitet, Datorseende, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72066.
Pełny tekst źródłaThis Master’s thesis is investigating the possibility of automatically identifyingditches in airborne collected LiDAR data. The chosen approach to identificationcommences by creating an elevation picture from the LiDAR data. Then it usesthe result of a line detection to exhibit candidates for ditches. The properties forthe various candidates are calculated through an analysis of the elevation profile forthe candidates, where the elevation profiles are created from the original data. Byfiltering the candidates according to their calculated properties, maps with ditchesconforming to user-specified limits are created and presented in vector format.This thesis describes how the algorithm is implemented and gives examples ofresults. After an analysis of the algorithm and a proposal for improvements, itis suggested that automatic detection of ditches in LiDAR collected data is anachievable objective.
Forsberg, Olof. "Semantic Stixels fusing LIDAR for Scene Perception". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224151.
Pełny tekst źródłaFullt självkörande fordon behöver inte förare. Ett sådant fordon behöver en precis, detaljerad och kompakt modell av omgivningen baserad på sensordata. Med detaljerad avses att modellen innefattar all information nödvändig för ett trafiksäkert beteende. Med kompakt avses att en snabb bearbetning kan göras av modellen så att fordonet i realtid kan fatta beslut och manövrera i trafiken. I denna uppsats tillämpas en metod där man med rektangulära objekt skapar en modell av omgivningen. Dessa beräknas från LIDAR och semantisk segmentering. Arbetet indikerar att med hjälp av semantisk segmentering kan en tät, detaljerad och kompakt modell göras även från glesa LIDAR-data.
Rawle, Christopher B., i n/a. "Coherent multiwavelength sources for tropospheric aerosol lidar". University of Otago. Department of Physics, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070427.114533.
Pełny tekst źródłaHirschberger, Markus Christoph. "Beiträge zur Erfassung von Wirbelschleppen mit Lidar". Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160756.
Pełny tekst źródłaGwenzi, David. "Lidar remote sensing of savanna biophysical attributes". Thesis, Colorado State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3720536.
Pełny tekst źródłaAlthough savanna ecosystems cover approximately 20 % of the terrestrial land surface and can have productivity equal to some closed forests, their role in the global carbon cycle is poorly understood. This study explored the applicability of a past spaceborne Lidar mission and the potential of future missions to estimate canopy height and carbon storage in these biomes.
The research used data from two Oak savannas in California, USA: the Tejon Ranch Conservancy in Kern County and the Tonzi Ranch in Santa Clara County. In the first paper we used non-parametric regression techniques to estimate canopy height from waveform parameters derived from the Ice Cloud and land Elevation Satellite’s Geoscience Laser Altimeter System (ICESat-GLAS) data. Merely adopting the methods derived for forests did not produce adequate results but the modeling was significantly improved by incorporating canopy cover information and interaction terms to address the high structural heterogeneity inherent to savannas. Paper 2 explored the relationship between canopy height and aboveground biomass. To accomplish this we developed generalized models using the classical least squares regression modeling approach to relate canopy height to above ground woody biomass and then employed Hierarchical Bayesian Analysis (HBA) to explore the implications of using generalized instead of species composition-specific models. Models that incorporated canopy cover proxies performed better than those that did not. Although the model parameters indicated interspecific variability, the distribution of the posterior densities of the differences between composition level and global level parameter values showed a high support for the use of global parameters, suggesting that these canopy height-biomass models are universally (large scale) applicable.
As the spatial coverage of spaceborne lidar will remain limited for the immediate future, our objective in paper 3 was to explore the best means of extrapolating plot level biomass into wall-to-wall maps that provide more ecological information. We evaluated the utility of three spatial modeling approaches to address this problem: deterministic methods, geostatistical methods and an image segmentation approach. Overall, the mean pixel biomass estimated by the 3 approaches did not differ significantly but the output maps showed marked differences in the estimation precision and ability of each model to mimic the primary variable’s trend across the landscape. The results emphasized the need for future satellite lidar missions to consider increasing the sampling intensity across track so that biomass observations are made and characterized at the scale at which they vary.
We used data from the Multiple Altimeter Beam Experimental Lidar (MABEL), an airborne photon counting lidar sensor developed by NASA Goddard to simulate ICESat-2 data. We segmented each transect into different block sizes and calculated canopy top and mean ground elevation based on the structure of the histogram of the block’s aggregated photons. Our algorithm was able to compute canopy height and generate visually meaningful vegetation profiles at MABEL’s signal and noise levels but a simulation of the expected performance of ICESat-2 by adjusting MABEL data's detected number of signal and noise photons to that predicted using ATLAS instrument model design cases indicated that signal photons will be substantially lower. The lower data resolution reduces canopy height estimation precision especially in areas of low density vegetation cover.
Given the clear difficulties in processing simulated ATLAS data, it appears unlikely that it will provide the kind of data required for mapping of the biophysical properties of savanna vegetation. Rather, resources are better concentrated on preparing for the Global Ecosystem Dynamics Investigation (GEDI) mission, a waveform lidar mission scheduled to launch by the end of this decade. In addition to the full waveform technique, GEDI will collect data from 25 m diameter contiguous footprints with a high across track density, a requirement that we identified as critically necessary in paper 3. (Abstract shortened by UMI.)
Shorter, Nicholas. "HEURISTIC 3D RECONSTRUCTION OF IRREGULAR SPACED LIDAR". Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3201.
Pełny tekst źródłaM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Yaacobi, Ami. "Integrated optical phased arrays for lidar applications". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100888.
Pełny tekst źródłaCataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 111-120).
It is no wonder that research in Si photonics (optical components embedded on a silicon platform) has bloomed so rapidly the last few years. Combining low loss, strong refractive index contrast (and, thus, light confinement), with electro-optical and thermo-optical effects, allows for the fabrication of dense and complex electro-optical Si photonics systems. Moreover, because it is based on the well-established platforms of the CMOS industry, Si photonics is expected to rapidly shift from a research field to the production of high volume, low cost, complex, integrated electro-optical systems. One class of systems receiving increasing interest are Nanophotonic Phased Arrays (NPAs), which offer free space emission of a manipulated beam that can be steered, focused, have controlled angular momentum and even create holograms. Still, some substantial challenges remain in applying these NPAs to real systems. Large cell size and spacing between adjacent antennas produce multiple beams and reduce effective steering angle. In addition, small beam angle requirements and large aperture in NPAs receivers demand large phased array size. In order to allow for both steering angle and large aperture, a large array with small cell size is required resulting large number of unit cells in one array. In this work, we first propose two metallic nanoantennas to couple between a waveguide mode to free space radiation. Then, by combining existing Si photonic components like directional couplers and modulators with optical antennas and phase shifters that were designed for this goal we demonstrate, in this work, several NPAs for various applications. Using unique architecture, we then, specifically focus on a, NPA based, lidar. These lidar systems are essential components in any autonomous system maneuvering in an undefined environment. An on chip lidar like this one can serve, for example, in the automotive industry for safety enhancement and to allow autonomous driving functionality at an affordable price.
by Ami Yaacobi.
Ph. D.
Castorena, Juan. "Remote-Sensed LIDAR Using Random Impulsive Scans". International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581855.
Pełny tekst źródłaBarsaglini, Reni Aparecida. "Pensar, vivenciar e lidar com o diabetes". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/313829.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
Made available in DSpace on 2018-08-08T02:33:53Z (GMT). No. of bitstreams: 1 Barsaglini_ReniAparecida_D.pdf: 2563294 bytes, checksum: 459d247bf4af378f145f27acb0b7dc16 (MD5) Previous issue date: 2006
Resumo: Este estudo analisa as representações sociais e a experiência com o diabetes mellitus, articulando a dimensão simbólica, a partir dos significados e do sentido atribuído à enfermidade, e a dimensão concreta do seu gerenciamento. A investigação é pertinente devido à importância epidemiológica do diabetes no quadro sanitário brasileiro, à escassez de pesquisas sobre as enfermidades ou as condições crônicas na área de Antropologia e Saúde, além de se constituir em oportunidade para articular os planos micro e macroanalíticos no estudo do adoecimento. Foi empregada a metodologia qualitativa, na perspectiva socioantropológica, combinando as técnicas da pesquisa documental, da entrevista, do relato oral e da observação em campo (bairros, residências, serviços de saúde) para coletar as informações sobre as quais se procedeu, posteriormente, a análise temática. A análise dos dados sobre o saber biomédico e os modelos de intervenção baseou-se em textos básicos sobre o assunto e em documentos oficiais normativos sobre a atenção dirigida ao diabetes, complementando-se com os discursos dos adoecidos com a enfermidade, de não-adoecidos e de profissionais de saúde que atendem os diabéticos. Pela abordagem que se designou ¿construtivista integradora¿, para a qual a realidade social é constituída pelas práticas interacionais e interpretativas, mas também pela participação de elementos da estrutura social, as representações sociais e a experiência da enfermidade foram tomadas articuladamente numa relação de influência circular como componentes do processo de adoecimento, relativizando, dessa forma, tanto a determinação social ou cultural quanto a total autonomia/liberdade do indivíduo. O conceito de representações sociais valeu-se da sociologia francesa com a abordagem herzlichiana, e a experiência da doença respaldou-se no suporte fenomenológico. Concluiu-se, neste estudo, que as formas como o adoecido pensa e lida com o diabetes envolvem fatores de ordem estrutural, simbólica, do contexto da vida diária, da biografia do sujeito, da experiência (prévia e atual, pessoal e de outras pessoas) e do próprio curso da doença. Os profissionais de saúde, embora imbuídos pelo discurso médico-científico, reinterpretam o saber erudito sobre o diabetes no exercício de sua prática, a partir da experiência (profissional e pessoal), passando-a pelo crivo das representações. Em ambos os segmentos, o adoecimento mobiliza saberes e práticas que, reciprocamente, são reelaborados em função da experiência, das representações e pela intermediação dos elementos contextuais
Abstract: The study analyzed the social representations and experience with diabetes, articulating the symbolic dimension based on the signification and the sense attributed to the illness, and the real dimension of its management. The investigation is pertinent to the epidemiological importance of diabetes regarding the condition of the public health in Brazil, the scarcity of researches on illnesses or chronic conditions in the Anthropology and Health area, besides the fact that it represents an opportunity to elaborate the macro and micro analytical plans in the study of the illness. The study applied the qualitative methodology through a social-anthropological perspective combining the techniques of documental research, interview, oral account and field observation (districts, households, health services) to gather the information which gave grounds for the thematic analysis. The analysis of the data on the biomedical knowledge and on the intervention models was based on basic texts on the issue, and on official normative documents about the attention given to diabetes, including the accounts of diabetics, non-diabetics and of health professionals who treat the illness. Through this ¿integrating constructivist¿ approach, to which social reality consists of interactional and interpretative practices and, also, of the participation of social structure elements; the social representations and the illness experience were articulately taken in a relation of circular influence as components of the illness onset process, making, this way, both the social and cultural determination and the individual¿s total autonomy/freedom relative. The concept of social representations is grounded in the French Sociology with the Claudine Herzlich approach, whereas the illness experience found grounds in the phenomenological support. The study concluded that the way a person suffering from diabetes thinks and deals with it involves material and symbolic factors of social context, of the day-to-day life, of the biography of the patient, of experience (current and previous, personal and of other¿s) and of the history of the disease itself. Health professionals, though imbued with the medical-scientific speech reinterpret the erudite knowledge on diabetes in their practice based on their personal and professional experience mediated by the representations. In both segments, the illness mobilizes knowledge and practices which are reciprocally redesigned in relation to the experience, to the representations mediated by the contextual elements
Doutorado
Saude Coletiva
Doutor em Saude Coletiva
Braga, José Renato Garcia. "Navegação autônoma de VANT por imagens LiDAR". Instituto Nacional de Pesquisas Espaciais (INPE), 2016. http://urlib.net/sid.inpe.br/mtc-m21c/2018/05.18.16.04.
Pełny tekst źródłaIn the last years, there was a gradual increase in the employment of Unmanned Aerial Vehicles (UAV) in several areas, among them, land-use monitoring, search and rescue operations, monitoring of environmental impacts, border surveillance, and others. There is an expectation that the use of UAVs will increase in the future, due to the low costs of development and low operational costs when compared to manned aircraft. The main advantage of the UAV employment is the absence of onboard crew, which reduces the risks to human life. With the increase of UAV employment, the development of systems for its autonomous navigation has been subject of several investigations. One of the tasks of autonomous navigation systems for UAV is to estimate its position. The main strategy applied for estimating the UAV position is the use of information from Inertial Navigation System (INS) combined with information from Global Navigation Satellite System (GNSS).The signal of GNSS can suffer an outage due to malicious attacks and natural phenomena. Thus, the development of a computer vision system, which uses images captured and processed in flight time, can be used to determine the UAV location and replace the information from GNSS. However, the development of a computer vision system for estimating the UAV position in a situation of flight over water-covered areas (eg the ocean) and flight in low light conditions is a challenge. In this context, this doctoral thesis presents an approach for estimating the geographical position of a UAV, when it flies over regions covered by water and regions with low light conditions. The approach uses images from an active sensor called Light Detection And Ranging (LiDAR) to allow the flight in those conditions. The proposed approach estimates the aircraft position by employing data fusion of two techniques of position estimation by computer vision: visual odometry and the image matching. The data fusion algorithm is performed by an Non-Extensible Particle Filter (NEPF). The approach requires that the processing be done in embedded systems and in flight time, thus, the proposed method is developed in portable and low-power high-performance computer. For the validation of the proposed method, two different data sets are applied: the first one composed by real flight data from an UAV, with images captured by its video camera; and the second one, a simulation using images from a LiDAR sensor. The approach results are promising for the UAV position estimation in regions covered by water or in regions with low light conditions.
Ferrari, Marco Antonio. "Laser de Nd:YLF para aplicações em LIDAR". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-02092009-150039/.
Pełny tekst źródłaThe use of diode pumped, solid state lasers has caused increasing interest due its high efficiency, compactness and possibility of operation in high peak powers. The goal of this work was the study of configurations of laser resonators that allow to obtain Q-switched pulses and a future frequency doubling, for LIDAR (Light Detection and Ranging) applications. Using as active medium Nd:YLF crystals grown by the Czochralski method at the Centro de Lasers e Aplicações IPEN USP, side pumping by laser diodes, with one, two, four and nine total internal reflexions of the laser beam at the surface of the crystals was employed. From the six resonators built, three of them were designed to work with low gain, pumped by a laser diode emitting at 806 nm. Another three laser resonators were designed to work with high pump absorption and high gain, pumped by a laser diode emitting at 797 nm. From the six developed resonators, the ones which showed the best optical conversion efficiency, were the resonators designed to work with high gain and high absorption (resonator four to six), showing 29,5% and 20,7% optical conversion efficiency, and enabling obtaining Q-switched pulses of 20 ns, with 160 kW peak power.
Cordovil, Luís Cary de Velho Cabral. "Lidar com a variância em produção conserveira". Master's thesis, Instituto Superior de Economia e Gestão, 2010. http://hdl.handle.net/10400.5/3126.
Pełny tekst źródłaNos tempos actuais, não basta ser rentável, há que criar uma cultura de melhoria contínua de forma a garantir a sustentabilidade futura do negócio. O Projecto proposto pretende pois estudar métodos e técnicas de planeamento e controlo da produção em ambientes de incerteza numa indústria conserveira de atum, de modo a maximizar o cumprimento do plano de produção e optimizar os recursos disponíveis. Deste modo integraram-se algumas incertezas no MRP II existente, e adoptaram-se algumas das técnicas e metodologias 6-Sigma, visando introduzir conceitos de lean manufacturing. Constatou-se que as soluções optadas permitiram alcançar o desiderato pretendido. Por fim, refira-se que o sucesso deste projecto deveu-se antes de mais à equipa do Pico e do Faial, cujo desempenho superou as expectativas.
Moleski, Travis W. "Trilateration Positioning Using Hybrid Camera-LiDAR System". Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1628267212548992.
Pełny tekst źródłaÖhman, Nikanor. "Simulation of LiDAR data for forestry applications". Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149993.
Pełny tekst źródłaNielsen, Kristin. "Robust LIDAR-Based Localization in Underground Mines". Licentiate thesis, Linköpings universitet, Reglerteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-175001.
Pełny tekst źródłaAdditional funding agency: Epiroc Rock Drills AB
Horowitz, Luke. "Adaptation of VT-Dbr Lasers for LIDAR". DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1902.
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