Dissertations / Theses on the topic 'Doppler continuous wave antennae'
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Glynn, Patrick Joseph, and n/a. "Collision Avoidance Systems for Mine Haul Trucks and Unambiguous Dynamic Real Time Single Object Detection." Griffith University. Griffith Business School, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060809.163025.
Full textGlynn, Patrick Joseph. "Collision Avoidance Systems for Mine Haul Trucks and Unambiguous Dynamic Real Time Single Object Detection." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/365488.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith Business School
Full Text
Yang, Wu. "Traffic Surveillance Using Low Cost Continuous Wave (CW) Doppler Radars." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347404224.
Full textLoata, Gabriel C. "Investigation of low-temperature-grown GaAs photoconductive antennae for continuous-wave and pulsed terahertz generation /." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985715871.
Full textSoh, Wei Ting. "High doppler resolution imaging by multistatic continuous wave radars using constructive techniques." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FSoh.pdf.
Full textThesis Advisor(s): Borden, Brett. "December 2007." Description based on title screen as viewed on January 22, 2008. Includes bibliographical references (p. 77-78). Also available in print.
Voss, Martin. "Continuous wave & Dopplerultrasonographie zur Vorhersage der Präeklampsie und anderer Schwangerschaftskomplikationen : eine Screening-Untersuchung an einer urbanen Bevölkerungsgruppe eines Entwicklungslandes /." Hamburg : Akademos Wissenschaftsverlag, 2002. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010049609&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textSlamdien, Muammar. "Mitigating interference from switch-mode power supplies in sampling receivers." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2513.
Full textThis thesis reports on the research and development of techniques applied to mitigate interference from switch-mode power supplies in sampling receivers and also more specifically for FMCW radar receiver applications. During the system testing phase of an FMCW Radar at Reutech Radar Systems (RRS), it was found that a large false target was emerging on the Range-Doppler Map (RDM). It was concluded that the problem was originating from interference caused by the switch-mode power supplies (SMPS), which supply DC power to the radar receiver subsystem. This then created the need for a new DC power supply, which is able to minimize the interference, as well as, mitigate the effects of the interference caused by the switching of the power supply. The mitigation techniques and power supply development was divided four main sections, namely, research, simulation, design and evaluation. The research involved obtaining background information on sampling receivers, sampling theory, Range-Doppler Processing, switch-mode power supplies, their effects and mitigation thereof. In the simulation phase, the research was utilised to simulate the various interference mitigation techniques. A power supply PCB was then designed in the design phase to practically illustrate the techniques being utilised. Lastly, during evaluation, this PCB was evaluated against the criteria set out in the research phase. The results demonstrated that the technique of synchronising the PWM clock to the Sampling frequency and SRF yielded a significant reduction in the SMPS noise on the Range-Doppler Map.
Abbagoni, Baba Musa. "Experimental investigations of two-phase flow measurement using ultrasonic sensors." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/11832.
Full textWetherill, Lindsay D. "Reproducibility of a continuous-wave Doppler ultrasound system for assessment of ascending aortic blood flow responses during graded exercise testing with healthy individuals." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80102.
Full textMaster of Science
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.
Full textCassidy, Scott L. "Millimetre-wave FMCW radar for remote sensing and security applications." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7856.
Full textSamad, Sarah. "Contactless detection of cardiopulmonary activity for a person in different scenarios." Thesis, Rennes, INSA, 2017. http://www.theses.fr/2017ISAR0030/document.
Full textNowadays, contact-less monitoring patient's heartbeat using Doppler radar has attracted considerable interest of researchers, especially when the traditional electrocardiogram (ECG) measurements with fixed electrodes is not practical in some cases like infants at risk or sudden infant syndrome or burn victims. Due to the microwave sensitivity toward tiny movements, radar has been employed as a noninvasive monitoring system of human cardiopulmonary activity. According to Doppler effect, a constant frequency signal reflected off an object having a varying displacement will result in a reflected signal, but with a time varying phase. In our case, the object is the patient's chest; the reflected signal of the person's chest contains information about the heartbeat and respiration. The system is based on a vector network analyzer and 2 horn antennas. The S21 is computed using a vector network analyzer. The phase variation of S21 contains information about cardiopulmonary activity. Processing techniques are used to extract the heartbeat signal from the S21 phase. This thesis presents a comparative study in heartbeat detection, considering different radiated powers and frequencies. The radiated powers used are between 3 and -17 dBm and the operational frequencies used are 2.4, 5.8, 10 and 20 GHz. This helps to make a compromise between the minimum power emitted and the complexity of the measurement system. In addition, a comparative study of several signal processing methods is proposed to extract the best technique for heartbeat measurement and thus to extract its parameters. Processing techniques are based on wavelet transforms and conventional filtering in order to make a comparison between them. The parameter extracted in this thesis is the heartbeat rate HR. Measurements were performed simultaneously with a PC-based electrocardiograph to validate the heartbeat rate measurement. Since the person can move from a room to another inside his home, measurements from the four sides of the person and behind a wall are performed. In addition, a modeling approach based on cardio-respiratory measurement for a person who is walking forward is presented. Furthermore, a comparison between single and two-antenna microwave systems for a non-breathing person is carried out to test the accuracy of the single-antenna system relative to the two antenna microwave system. After that, measurements are performed using one antenna microwave system for a person who breathes normally
Vlkovič, Vladimír. "Měření rychlosti vozidel s použitím radaru." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-413299.
Full textLin, Yi-Fan, and 林以凡. "Antenna Distance Analysis and Design for Wider Angle Detection for Mono-pulse Continuous Wave Doppler Radar and Characterization of High Frequency Transmission Line On Flexible Substrate." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/28046973032985397508.
Full text國立臺灣大學
電信工程學研究所
102
Two antenna layouts are realized in two different kinds of fabrication process which are LTCC (low temperature co-fired ceramics) and PCB (printed circuit board) in a limited area for monopulse radar system that includes one transceiving and two receiving antennas. The radar system uses Doppler effect to determine the speed of the target and the monopulse ratio which is determined by radiation modes of sum and difference pattern to detect the angle of the target. Due to limited area, two receiving antennas are forced to place in the distance smaller than a wavelength, the isolation between two receiving antennas becomes a big issue that we can’t be ignored. I obstruct the radiated pattern away from the broadside direction. So we use the antenna theory to reconsider the signal we may receive in order to have a reliable measurement. The operating mechanism and details of the antenna design are discussed. Experimental and simulated results are both presented and discussed. The 3rd and 4th Chapter will discuss the characteristic of the transmission lines fabricated on flexible substrate, because of the difficulty and price issue, multilayer substrate is not comparable with single layer substrate. Take the advantage of the flexibility of the transmission line, we can connect substrate with it to accomplish a new 3D package. In this part, we will first introduce the fabrication process, how to produce these materials and their parameters. Then the second part is the introduction of the measurement. TRL calibration method is used to remove the error caused by equipment we used in measurement. At 4th chapter, it will show scattering parameters. By the measurement results we can get permittivity and loss tangent. Comparison between measurement and simulation will also be presented. The last chapter is the conclusion of this thesis and the future work.
Wang, Lu-Wen, and 王律文. "Power-Efficient Ultrasound Receiver in Continuous Wave Doppler Mode." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/p2x3h7.
Full text國立臺灣大學
電子工程學研究所
105
In the clinical applications, Doppler ultrasound is widely used to understand the circulation physiology and the evaluation of cardiovascular hemodynamics. By means of analyzing the amplitude and the frequency shift (Doppler shift) of the received ultrasound signals, it is possible to acquire the information about flow rate and flow direction of blood. Recently, the demand for portable ultrasound imaging system with high performance becomes larger as the medical technology is advanced. In general, commercial products of ultrasound receiver include two receiving mechanisms, time-gain-compensation (TGC) mode and continuous-wave (CW) Doppler mode. These two operation modes have a shared LNA at the circuit input, however, only the circuit system of TGC mode is fully integrated on single chip due to the strict limit of performance. Based on the advantages and the characteristics of a complementary metal-oxide-semiconductor (CMOS) process, a low cost, power-efficient and fully integrated ultrasound receiver in continuous-wave Doppler (CWD) mode is presented in this thesis. The proposed CWD receiver is composed of multi-channel LNAs, mixers, summing amplifier, anti-aliasing filter, audio-frequency analog-to-digital converter (ADC) and clocking circuit for local oscillator (LO) generation. Except the clocking circuit and LNAs, all the circuit blocks include in-phase and quadrature (I/Q) channels. In the circuit designs, the proposed LNA adopts a high-out-swing topology and a linearity-improving skill to lower the total harmonic distortion (THD) and the two-tone third-order intermodulation distortion (IMD3). Combining advantages of the passive mixer and the characteristic of virtual short in an operational amplifier (Op-amp) based inverting amplifier, the mixers used in this design reduce the degradation of dynamic range (DR) during the beamforming and the down-conversion of amplified signals. Besides, a skill of improving the phase margin of common-mode feedback (CMFB) loop in both the summing amplifier and filter which are based on fully differential op-amps is demonstrated. Based on an existing layout skill of using the sandwich capacitor as a unit capacitor in a capacitive digital-to-analog (CDAC) array of successive approximation (SAR) ADC, a hybrid sandwich capacitor is proposed to increase the capacitance of unit capacitor occupying an equal area. In addition, the corresponding layout floor plan and wiring skill inside CDAC is also depicted to effectively control the generation of parasitic capacitors and prevent the linearity of converter from deterioration because of them. Finally, offset-calibrating circuits adopting a digital method are used to remove offsets at outputs of differential circuits. It can not only keep from a decrease in dynamic range (DR) of entire system due to the wrong operation region of transistors but also avoid using lots of off-chip capacitors which is needed in an analog method and would increase the cost.
Loata, Gabriel C. [Verfasser]. "Investigation of low-temperature-grown GaAs photoconductive antennae for continuous-wave and pulsed terahertz generation / von Gabriel C. Loata." 2007. http://d-nb.info/985715871/34.
Full textHuang, Ying-Hua, and 黃應化. "Measurement of Blood Velocity by Using a Miniature Portable Continuous Wave Doppler Ultrasound Device." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/86242501297675364105.
Full text輔仁大學
電機工程學系碩士班
103
Since 2000, the highest incident rate of ESRD (End Stage Renal Disease) was reported by Taiwan (dialysis only), increasing 8 – 10 percent per year. There are two types of dialysis: hemodialysis and peritoneal dialysis. In hemodialysis, an artificial kidney is used to remove waste and extra chemicals and fluid from your blood. To get your blood into the artificial kidney, the doctor needs to make an access (entrance) into your blood vessels. This is done by minor surgery to your arm or leg. Sometimes, an access is made by joining an artery to a vein under your skin to make a bigger blood vessel called a arteriovenous fistula. In recent years, blood flow measurement by using Doppler ultrasound has become a useful tool for diagnosing cardiovascular diseases and as a physiological signal monitor. Recently, a couple of pocket-sized ultrasound scanners have been introduced for portable diagnosis. A 5-MHz ultrasonic surface transducer was designed for the dynamic monitoring of blood flow velocity. The directional audio Doppler shift signals were obtained using a portable analog circuit system. Then the Doppler signals were fed directly to a computer for Doppler spectrogram analysis and display in monitor. In order to verify our system, we simulate the state of blood flow by using Harvard’s flow pump for in vitro verification. Finally, the blood flow of volunteer carotid were measured in vivo to verify the performance of portable CW Doppler ultrasound device. All of results compare with commercial ultrasound system and demonstrated the feasibility of our ultrasound system.
Nieh, Chi-hsuan, and 聶啓軒. "Analysis of Micro-Doppler Effect of Human Gait by Through-Wall Continuous-Wave Radar." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34608152096274529552.
Full text國立中央大學
遙測科技碩士學位學程
102
Radar Doppler has various applications in both military and civil aspect. The target moving parameters such as moving direction, moving velocity and so on can be well estimated through the analysis of radar Doppler effects. A new research called micro-Doppler which is proposed by the famous scholar Victor C. Chen was developed on the basis of micro motion model of objects. Since the human beings and the other creatures usually walk or run with a constant velocity, stride and gait frequency, there are some micro-Doppler signatures on their spectrums. Human gait detection and characteristic extraction mainly utilize the human’s walking dynamic features to modulate the radar echo phase, use time-frequency analysis method to obtain the spectrum, and extract the micro-Doppler signature of human gait from spectrum. Through wall surveillance (TWS) is a kind of detection technology which can penetrate walls and other obstacles. With the ability of through-obstacle detection, TWS has been playing an important role in military reconnaissance, counter-terrorism, hostage rescue, earthquake casualty search and so on. In this study, the micro-Doppler effect of the vibration and rotation is firstly discussed which is depend on the specific micro motion, and followed by the tool of time-frequency analysis. A gait echo model is proposed, which represents the rotation angles, displacements and relative phase relationship of joints, scatterers and the instantaneous Radar Cross Section (RCS). Finally, micro Doppler is combined with TWS for the feasibility of human gait direction determination.
Anderson, Michael Glen 1979. "Design of multiple frequency continuous wave radar hardware and micro-Doppler based detection and classification algorithms." Thesis, 2008. http://hdl.handle.net/2152/4000.
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