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Artigos de revistas sobre o tema "Signal stations"

Autor: Grafiati

Publicado: 29 de julho de 2024

Última modificação: 31 de julho de 2025

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1

Mayowa, Gbalaja. "Assessment of Radio Waves Propagation Pattern from Radio Stations in Lokoja and Okene, Kogi State, Nigeria." Advanced Journal of Science, Technology and Engineering 2, no. 1 (2022): 78–92. http://dx.doi.org/10.52589/ajste-au9cs6sp.

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Okene, Lokoja and their environs have been experiencing radio signal distortions and have been of great concern to the citizens due to bad quality signals and signal attenuation increase. This study assesses the patterns of radio wave propagation from five radio stations in Lokoja and Okene, Kogi State, Nigeria. Equipment, a field strength metre was used to measure signal strengths and quality of radio signals. Six locations in both Lokoja, Okene and the environs were selected for each radio station. The approximate distances between the transmitting and receiving antennas were determined. Thi

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Wang, Xiaoye, Yalan Wang, Leyun Fu, and Qing Hu. "An AIS Base Station Credibility Monitoring Method Based on Service Radius Detection Patterns in Complex Sea Surface Environments." Journal of Marine Science and Engineering 12, no. 8 (2024): 1352. http://dx.doi.org/10.3390/jmse12081352.

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The Automatic Identification System (AIS) utilizes base stations to manage vessel traffic and disseminate waterway information. These stations broadcast maritime safety data to vessels within their service radius using VHF signals. However, the emergence of “spoofing base stations” poses a significant threat to maritime safety. These impostors mimic legitimate AIS base stations by appropriating their Maritime Mobile Service Identity (MMSI) information, interacting with vessels, potentially leading to erroneous decisions, or guiding vessels into hazardous areas. Therefore, ensuring the credibil

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Jin, Jionghua. "Individual Station Monitoring Using Press Tonnage Sensors for Multiple Operation Stamping Processes." Journal of Manufacturing Science and Engineering 126, no. 1 (2004): 83–90. http://dx.doi.org/10.1115/1.1643749.

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In multiple operation stamping processes, a press tonnage signal measured by press tonnage sensors installed on press linkages/uprights, is the summation of die forces at all stations. Different from the current practice of using a whole cycle of press tonnage signals to monitor the compound condition of all stations, this paper proposes a new method to use the partitioned monitoring segments of press tonnage signals to monitor individual station conditions. For this purpose, a generic signal segmentation principle is proposed, and the Hotelling T2 control charts are developed with considerati

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Yusuf, Samson Dauda, Mayowa Gbalaja, Obiri Game Okara, and Sule Idris Isah. "Comparative Analysis of the Signal Strength of Two Radio Stations in Okene, Kogi State, Nigeria." Archives of Current Research International 24, no. 11 (2024): 111–20. http://dx.doi.org/10.9734/acri/2024/v24i11953.

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There are significant concerns for the citizens of Okene and its surroundings; regarding the distortions experienced in radio signals due to increased attenuation, which have resulted in poor signal quality. This study carried out a comparative analysis of the signal strength of two radio broadcast stations in Okene, Kogi State, Nigeria, using a field strength meter. The study involved measuring the signal strength for each radio stations at six selected locations in Okene and surrounding area. The wavelength and free space path-loss was calculated at sixteen different locations. The results i

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5

Parshutkin, Andrey, Dmitry Levin, and Aleksey Galandzovskiy. "Simulation model of radar data processing in a station network under signal-like interference." Information and Control Systems, no. 6 (January 16, 2020): 22–31. http://dx.doi.org/10.31799/1684-8853-2019-6-22-31.

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Introduction: Radar stations, when tracking targets in a complex interference environment, form not only target marks but also false marks. A well-developed theory and technique of noise stability is not useful under signal-like interference caused by re-reflections, multi-path propagation or retransmission of the probing signals. The reliability of radar information processing under signal-like interference can be improved by joint processing of data from several spaced posts in a radar station network. Purpose: development of а simulation model which would allow you to estimate the effective

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Chang, Sang-Yoon, Kyungmin Park, Jonghyun Kim, and Jinoh Kim. "Flying Base Station Channel Capacity Limits: Dependent on Stationary Base Station and Independent of Positioning." Electronics 13, no. 12 (2024): 2234. http://dx.doi.org/10.3390/electronics13122234.

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Flying base stations, also known as aerial base stations, provide wireless connectivity to the user and utilize their aerial mobility to improve communication performance. Flying base stations depend on traditional stationary terrestrial base stations for connectivity, as stationary base stations act as the gateway to the backhaul/cloud via a wired connection. We introduce the flying base station channel capacity to build on the Shannon channel capacity, which quantifies the upper-bound limit of the rate at which information can be reliably transmitted using the communication channel regardles

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FABO, Peter, Pavol NEJEDLÍK, Michal KUBA, Milan ONDERKA, and Dušan PODHORSKÝ. "Applicability of the ultra-high radio frequency band (UHF) for hydrometeor detection by phase difference method." Contributions to Geophysics and Geodesy 51, no. 2 (2021): 109–27. http://dx.doi.org/10.31577/congeo.2021.51.2.1.

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Hydrometeors (rain, fog and ice crystals) affect the transmission of electromagnetic signals. Previous research showed that alterations in the signal (amplitude and phase) are affected by the composition of the atmosphere, e.g. the presence of hydrometeors. The majority of hydrometeorological detecting methods are based on the attenuation of electromagnetic signals as they penetrate the atmosphere. Novel methods based on monitoring of parameters of the signal appeared in recent time. This article presents the first results from our investigation of how hydrometeors affect the phase differences

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Turner, Ross J., Anya M. Reading, and Matt A. King. "Separation of tectonic and local components of horizontal GPS station velocities: a case study for glacial isostatic adjustment in East Antarctica." Geophysical Journal International 222, no. 3 (2020): 1555–69. http://dx.doi.org/10.1093/gji/ggaa265.

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SUMMARY Accurate measurement of the local component of geodetic motion at GPS stations presents a challenge due to the need to separate this signal from the tectonic plate rotation. A pressing example is the observation of glacial isostatic adjustment (GIA) which constrains the Earth’s response to ice unloading, and hence, contributions of ice-covered regions such as Antarctica to global sea level rise following ice mass loss. While both vertical and horizontal motions are of interest in general, we focus on horizontal GPS velocities which typically contain a large component of plate rotation

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Shi, Xinlei, Xiaofei Zhang, and Haowei Zeng. "Direct Position Determination of Non-Circular Sources for Multiple Arrays via Weighted Euler ESPRIT Data Fusion Method." Applied Sciences 12, no. 5 (2022): 2503. http://dx.doi.org/10.3390/app12052503.

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In recent years, direct position determination (DPD) with multiple arrays for non-circular (NC) signals is a hot topic to research. Conventional DPD techniques with spectral peak search methods have high computational complexity and are sensitive to the locations of the observation stations. Besides, there will be loss when the signal propagates in the air, which leads to different received signal-to-noise ratios (SNRs) for each observation station. To attack the problems mentioned above, this paper derives direct position determination of non-circular sources for multiple arrays via weighted

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10

Wei, S. S., Xiao Qing Zeng, T. Shen, Y. J. Chen, and W. Y. Wang. "A Method for Correction Ranging of Train Based on RSSI." Applied Mechanics and Materials 743 (March 2015): 484–90. http://dx.doi.org/10.4028/www.scientific.net/amm.743.484.

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In the railway operation, it's significant to obtain the distances between trains. A method based on RSSI for ranging and correction is proposed in this paper. The devices include a number of base stations installed along railways. The front train would send an active signal to the nearby base station N, when it transmits power signal to the following one. The following train also gives an active signal to its nearest base station 1 which would be enabled to gain signal from station N. The error of per meter of every section would be calculated by the known distance between base stations. The

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Xi, Yanpeng, Jian Liu, and Wenhao Zhao. "SATCOM Earth Station Arrays Anti-Jamming Based on MVDR Algorithm." Applied Sciences 13, no. 14 (2023): 8337. http://dx.doi.org/10.3390/app13148337.

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In modern life, a large amount of information is transmitted through satellites. The anti-jamming ability of satellite communication earth stations is the basis for ensuring the smooth flow of information. In the case that multiple small earth stations cannot communicate due to jamming, the minimum variance distortionless response (MVDR) algorithm based on reflector antenna array is proposed. Firstly, the gain expression of satellite communication earth station antenna is derived, and the mathematical model of the received signal of the reflector antenna array is established. Then, the MVDR be

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12

Annisa, Risa, Miftahul Jannah, Adhi Harmoko Saputro, and Titik Lestari. "Enhancing Seismic Data Accuracy: An Advanced Health Diagnosis Method for Seismometers Performance Evaluation." Journal of Physics: Conference Series 2866, no. 1 (2024): 012049. http://dx.doi.org/10.1088/1742-6596/2866/1/012049.

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Abstract Seismometers play a crucial role in monitoring seismic activities, yet their performance can degrade over time due to environmental conditions, aging components, and external disturbances. This study introduces an innovative seismometer health diagnosis method based on seismic signal analysis tailored for the Indonesian earthquake station network. The proposed method involves trim signal, signal resampling, filtering, and deconvolution of instrument response to process seismic data from the earthquake station network in Indonesia, specifically from Honshu, Japan 2024 of seismic events

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Enice Sanyaolu, Modupe, and Sanyaolu Olufemi. "Seasonal and latitudinal variations of surface radio refractivity over Nigeria." Indonesian Journal of Electrical Engineering and Computer Science 28, no. 3 (2022): 1548. http://dx.doi.org/10.11591/ijeecs.v28.i3.pp1548-1553.

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Refractivity is a significant challenge of radio signal propagation. As it often distorts or leads to loss of signals. The seasonal and latitudinal variations of surface refractivity at three Nigerian tropospheric Observatory stations in Nigeria, namely Port-Harcourt, Lagos, and Makurdi, are presented in this paper. Values of monthly averages of pressure, temperature, relative humidity, and water vapour from the stations were used to compute surface refractivity at each station. The results show that the values of surface refractivity increase from the arid region in the north to the coastal a

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Eunice, Sanyaolu Modupe, and Sanyaolu Olufemi. "Seasonal and latitudinal variations of surface radio refractivity over Nigeria." Indonesian Journal of Electrical Engineering and Computer Science 28, no. 3 (2022): 1548–53. https://doi.org/10.11591/ijeecs.v28.i3.pp1548-1553.

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Refractivity is a significant challenge of radio signal propagation. As it often distorts or leads to loss of signals. The seasonal and latitudinal variations of surface refractivity at three Nigerian tropospheric Observatory stations in Nigeria, namely Port-Harcourt, Lagos, and Makurdi, are presented in this paper. Values of monthly averages of pressure, temperature, relative humidity, and water vapour from the stations were used to compute surface refractivity at each station. The results show that the values of surface refractivity increase from the arid region in the north to the coastal a

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15

Mao, Jiaqi, Feng Luo, and Xiaoquan Hu. "Distributed Passive Positioning and Sorting Method for Multi-Network Frequency-Hopping Time Division Multiple Access Signals." Sensors 24, no. 22 (2024): 7168. http://dx.doi.org/10.3390/s24227168.

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When there are time division multiple access (TDMA) signals with large bandwidth, waveform aliasing, and fast frequency-hopping in space, current methods have difficulty achieving the accurate localization of radiation sources and signal-sorting from multiple network stations. To solve the above problems, a distributed passive positioning and network stations sorting method for broadband frequency-hopping signals based on two-level parameter estimation and joint clustering is proposed in this paper. Firstly, a two-stage filtering structure is designed to achieve control filtering for each freq

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16

Li, Yingping, William Prothero, Clifford Thurber, and Rhett Butler. "Observations of ambient noise and signal coherency on the Island of Hawaii for teleseismic studies." Bulletin of the Seismological Society of America 84, no. 4 (1994): 1229–42. http://dx.doi.org/10.1785/bssa0840041229.

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Abstract Ambient seismic noise conditions at several sites on the Island of Hawaii have been studied by analyzing noise power spectral density (PSD) and signal-to-noise ratio (SNR) of teleseisms. Broadband digital waveform data used in this study were collected during Project ALOHA. Direct comparison of noise PSD and SNR of teleseisms simultaneously recorded at stations on Hawaii and at station KIP on Oahu indicates that the stations on Hawaii are quieter than station KIP on Oahu in the frequency band of 0.1 to 1 Hz, suggesting that the Island of Hawaii can provide better noise conditions than

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17

Jannah, Miftahul, Risa Annisa, Adhi Harmoko Saputro, and Titik Lestari. "Seismometer Health Diagnosis Based on Cross Spectral Density Coherence Method in Indonesia Seismic Networks." Spektra: Jurnal Fisika dan Aplikasinya 9, no. 3 (2024): 179–88. https://doi.org/10.21009/spektra.093.05.

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Evaluation of seismometer health is crucial in accurately detecting earthquake and tsunami events. Currently, seismometer health evaluation is based solely on data quality unrelated to seismometer sensor performance. While seismometers are essential for tracking seismic activity, environmental factors, aging components, and external interference can cause seismometers to function worse over time. This study presents a seismometer health diagnosis technique based on seismic signal analysis, including signal truncation, signal resampling, filtering, and deconvolution of instrument response. Then

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18

Colalillo, Roberta. "The observation of lightning-related events with the Surface Detector of the Pierre Auger Observatory." EPJ Web of Conferences 197 (2019): 03003. http://dx.doi.org/10.1051/epjconf/201919703003.

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The Pierre Auger Observatory, designed to detect ultra-high energy cosmic rays, can be a valid instrument at the ground to study phenomena related to the atmospheric electricity. The fluorescence detector is a powerful instrument to observe ELVES thanks to its excellent time resolution, while peculiar events with a large number of triggered stations have been recorded by the surface detector. The characteristic signal of these events lasts more than 10 μs, about two orders of magnitude more than the duration of a signal produced by a cosmic muon. Moreover, each of these events has at least one

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19

Schwertman, Neil C. "Discovering an Optimal Property of the Mean." Mathematics Teacher 93, no. 4 (2000): 304–11. http://dx.doi.org/10.5951/mt.93.4.0304.

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This activity introduces a mathematical idea that has several applications, which include determining the optimal location for a radio station's transmitter and determining the best locations for a fire station. Radio stations must determine the location of their transmitters so that they can broadcast the strongest possible signal and offer the broadest coverage to their listeners. The circular area covered by a transmitter at the center increases in proportion to the square of the radius. As it covers a larger area, the strength of a transmitted signal decreases proportionally to the area, o

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LUZHANSKY, V., L. V. KARPOVA, and A. POVKH. "INVESTIGATION OF SIGNAL DISTURBANCE OF THE SIGNAL AT THE INPUT OF THE MOBILE STATION RECEIVER WITH DIFFERENT CHARACTERISTICS OF BASE STATIONS IN THE CONDITIONS OF CITY BUILDING." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 295, no. 2 (2021): 206–13. http://dx.doi.org/10.31891/2307-5732-2021-295-2-206-213.

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The purpose of the scientific paper is to study the effects of internal system interference caused by the movement of a mobile station in the cell of the service area, which involves the use of the same frequencies, which worsens the communication conditions. The article provides calculation formulas for determining the signal-to-noise ratio at the input of the receiver of the mobile station. Calculations, including tables and figures, for different characteristics of base stations (BS) of the mobile network are also given. The analysis of literature sources shows insufficient depth of the con

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Pochernyaev, V. N., N. M. Syvkova, and V. S. Povkhlib. "SPATIAL DIVERSITY SIGNAL TRANSMISSION IN DIGITAL TROPOSCATTER STATIONS." Proceedings of the O.S. Popov ОNAT 1, no. 2 (2020): 92–99. http://dx.doi.org/10.33243/2518-7139-2020-1-2-92-99.

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The article examines the possibility of increasing the normalized throughput of digital troposcatter stations on the way of using space-separated signal transmission. Shown is a block diagram of the transmitting path of a digital troposcatter station with space-separated signal transmission. Methods of separation at the reception of signals acting at the input of the space-time coding device of the transmission path of the microwave digital troposcatter station are analyzed. Three methods of signal addition are considered in detail: linear addition; auto selection; optimal (quasi-optimal) addi

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Chen, Jian, Yongkun Shi, Jiaquan Sun, Jiangkuan Li, and Jing Xu. "Base Station Planning Based on Region Division and Mean Shift Clustering." Mathematics 11, no. 8 (2023): 1971. http://dx.doi.org/10.3390/math11081971.

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The problem of insufficient signal coverage of 5G base stations can be solved by building new base stations in areas with weak signal coverage. However, due to construction costs and other factors, it is not possible to cover all areas. In general, areas with high traffic and weak coverage should be given priority. Although many scientists have carried out research, it is not possible to make the large-scale calculation accurately due to the lack of data support. It is necessary to search for the central point through continuous hypothesis testing, so there is a large systematic error. In addi

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Hoole, Paul Ratnamahilan Polycarp, Lwin Maw Abdul Raheem, Ramiah Harikrishnan, Kanesan Jeevan, and Samuel Ratnajeevan Herbert Hoole. "A Three-Element Handheld Mobile Communication Antenna for Desired Signal Reception and Reflected Signal Cancellation." Materials Science Forum 721 (June 2012): 153–58. http://dx.doi.org/10.4028/www.scientific.net/msf.721.153.

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Abstract. Space diversity, where antennas are separated in space at the receiver, is considered one of the most effective ways of eliminating unwanted signals in order to maximize the signal to noise ratio of the desired signal. Moreover it may be used to receive a signal that has gone through less fading when the direct path signal may have undergone deep fade. In this paper we use analytical electromagnetic solutions for the radiated signals to implement antenna space diversity on small handheld receiver units of mobile stations. While using the standard time difference of arrival method to

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Chen, Chih Yung, and Rey Chue Hwang. "Station Deployment and Signal Filter Design for Performance Evaluation of Indoor Positioning System." Advanced Materials Research 722 (July 2013): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amr.722.306.

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This paper investigates enhancement of fuzzy logic indoor positioning system (FLIPS) and its effect upon the wireless station deployment. The proposed scheme adopts an average filter to improve stability in transforming received signal strength (RSS) between a sensor and stations into distance. Based on the reliable distance data set, a fuzzy logic inference engine determines precise coordinates of the sensor. In order to evaluate the optimal deployment of wireless stations, this study experiments on three different size test areas within three to eight stations. Those results provide consider

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Wagner, Dörte, Birger Tinz, and Hans von Storch. "Signal Stations: Newly Digitized Historical Climate Data of the German Bight and the Southern Baltic Sea Coast." Journal of Atmospheric and Oceanic Technology 33, no. 12 (2016): 2735–41. http://dx.doi.org/10.1175/jtech-d-15-0199.1.

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AbstractAt the German Meteorological Service in Hamburg, handwritten journals of meteorological observation data of 164 signal stations exist that were digitized. These data contain long-term time series of up to 125 years for the period 1877–1999 and allow for studies of regional meteorological conditions with greatly improved spatial resolution. Wind and air pressure data of selected signal stations along the German Bight and the southern Baltic Sea coast show a spatial data homogeneity that allows for an improved description of two historical storms, in 1906 and 1913. This is the first pres

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Kumar, Ravind, Mark Stephens, and Tony Weir. "Temperature trends in Fiji: a clear signal of climate change." South Pacific Journal of Natural and Applied Sciences 31, no. 1 (2013): 27. http://dx.doi.org/10.1071/sp13002.

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This paper analyses trends in temperature in Fiji, using data from more stations (10) and longer periods (52-78 years) than previous studies. All the stations analysed show a statistically significant trend in both maximum and minimum temperature, with increases ranging from 0.08 to 0.23°C per decade. More recent temperatures show a higher rate of increase, particularly in maximum temperature (0.18 to 0.69°C per decade from 1989 to 2008). This clear signal of climate change is consistent with that found in previous studies of temperatures in Fiji and other Pacific Islands. Trends in extreme va

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LUZHANSKIY, Viktor, Lesia KARPOVA, and Maksym KANYUKA. "INFLUENCE OF THE TRANSMISSION RATE OF DIGITAL INFORMATION STREAMS IN VSAT-BASED SATELLITE COMMUNICATION NETWORKS WITH APPROPRIATE SIGNAL-TO-NOISE RATIOS ON THE PROBABILITY OF BIT ERROR." Herald of Khmelnytskyi National University 303, no. 6 (2021): 207–15. http://dx.doi.org/10.31891/2307-5732-2021-303-6-207-215.

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Among the satellite technologies, special attention is paid to the development of satellite communication technologies based on VSAT (Very Small Aperture Terminal). Small ground station VSAT, a terminal with a very small antenna diameter (0.9 … 3.5 m), allows the use of VSAT stations antennas. This makes it possible to significantly reduce the size and cost of ground stations, the power of their transmitters and make their use widespread. VSAT equipment makes it possible to build multiservice networks that provide all modern communication services: Internet access; telephone connection; transm

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Xiang, Cai Bing, Shao Feng Bian, and Ze Min Wu. "Study on Triple-Antenna KINRTK Problem Using BDS Signal." Advanced Materials Research 945-949 (June 2014): 2323–26. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.2323.

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Traditional kinematic baseline resolution usually needs one or more fixed reference station. In some special application, the reference stations could be in motion. In order to determine kinematic baselines in scenarios of moving reference stations and rovers, a KINRTK model is studied by using a baseline length constraint with three antenna configuration. The baseline and integer resolution method are given. A KINRTK experiment is done, using the data collected on ship enroute, the resolved baselines lengths are compared with the predetermined baselines, which show that the KINREK models base

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Deng, Zhongliang, Buyun Jia, Shihao Tang, Xiao Fu, and Jun Mo. "Fine Frequency Acquisition Scheme in Weak Signal Environment for a Communication and Navigation Fusion System." Electronics 8, no. 8 (2019): 829. http://dx.doi.org/10.3390/electronics8080829.

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A novel communication and navigation fusion system (CNFS) was developed to realized high accuracy positioning in constrained conditions. Communication and navigation fusion signal transmitted by base stations are in the same time and frequency band but are allocated different power levels. The positioning receiver of CNFS requires signal coverage of at least four base stations to realize positioning. The improvement of receiver sensitivity is an important way to expand signal coverage of base station. As an essential stage of signal processing in CNFS positioning receiver, signal acquisition r

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Семенова, Олена, Андрій Семенов, Андрій Луцишин, and Вадим Дира. "Artificial Intelligence Techniques for Mobile Station Location Estimation." Security of Infocommunication Systems and Internet of Things, no. 1 (June 30, 2023): 01006. http://dx.doi.org/10.31861/sisiot2023.1.01006.

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Modern wireless communication systems require positioning functions, which provide are automatic location estimation of stations within a network. However, when new networks are implemented, much higher accuracy is required when determining geographical coordinates of a mobile station to develop of services related to the station location. To solve the problem of mobile station positioning, its geographical coordinates are calculated, coordinates of the closest base stations being known. The paper proposes to use a genetic neuro-fuzzy controller for improving the effectiveness of positioning a

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Zhang, Shane, Lili Feng, and Michael H. Ritzwoller. "Three-station interferometry and tomography: coda versus direct waves." Geophysical Journal International 221, no. 1 (2020): 521–41. http://dx.doi.org/10.1093/gji/ggaa046.

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SUMMARY Traditional two-station ambient noise interferometry estimates the Green’s function between a pair of synchronously deployed seismic stations. Three-station interferometry considers records observed three stations at a time, where two of the stations are considered receiver–stations and the third is a source–station. Cross-correlations between records at the source–station with each of the receiver–stations are correlated or convolved again to estimate the Green’s function between the receiver–stations, which may be deployed asynchronously. We use data from the EarthScope USArray in th

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Abancó, C., M. Hürlimann, and J. Moya. "Analysis of the ground vibration generated by debris flows and other torrential processes at the Rebaixader monitoring site (Central Pyrenees, Spain)." Natural Hazards and Earth System Sciences 14, no. 4 (2014): 929–43. http://dx.doi.org/10.5194/nhess-14-929-2014.

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Abstract. Monitoring of debris flows using ground vibration sensors has increased in the last two decades. However, the correct interpretation of the signals still presents ambiguity. In the Rebaixader monitoring site (Central Pyrenees, Spain) two different ground vibration stations are installed. At the first station the ground velocity signal is transformed into an impulses-per-second signal (low frequency, 1 Hz). The analysis of the data recorded at this station show that the shape of the impulses signal is one of the key parameters to describe the evolution of the event. At the second stat

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Oktar, Osman, and Hediye Erdoğan. "Research of behaviors of continuous GNSS station by signal analysis methods." Earth Sciences Research Journal 22, no. 1 (2018): 19–27. http://dx.doi.org/10.15446/esrj.v22n1.62552.

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Continuously Operating Reference Station (CORS) networks consisting of multiple GNSS systems have been set up and operating in many developed countries. In Turkey, CORS-TR has been operating. The aim of CORS-TR is a fast, correct, and reliable collection of all kinds of geographic data, thus, speeding up the activities of cadastre, assuring organized urbanization, constituting the spatial infrastructure for relevant works of e-government, and monitoring plate tectonics. Therefore, in this paper, we investigated 788 days of linear and periodic of AKHR, BEYS, CIHA, KAMN, YUNA, AKSI and KNYA CORS

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Bao, Zhenyu, Shanshan Yong, Xin’an Wang, Chao Yang, Jinhan Xie, and Chunjiu He. "Seismic Reflection Analysis of AETA Electromagnetic Signals." Applied Sciences 11, no. 13 (2021): 5869. http://dx.doi.org/10.3390/app11135869.

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Acoustic and electromagnetics to artificial intelligence (AETA) is a system used to predict seismic events through monitoring of electromagnetic and geoacoustic signals. It is widely deployed in the Sichuan–Yunnan region (22° N–34° N, 98° E–107° E) of China. Generally, the electromagnetic signals of AETA stations near the epicenter have abnormal disturbances before an earthquake. When a significant decrease or increase in the signal is observed, it is difficult to quantify this change using only visual observation and confirm that it is related to an upcoming large earthquake. Considering that

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Kitchen, Frank. "THE NAPOLEONIC WAR COAST SIGNAL STATIONS." Mariner's Mirror 76, no. 4 (1990): 337–44. http://dx.doi.org/10.1080/00253359.1990.10656321.

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Cho, Seong-Yun. "Simultaneous LTE Signal Propagation Modelling and Base Station Positioning Based on Multiple Virtual Locations." Sensors 22, no. 15 (2022): 5917. http://dx.doi.org/10.3390/s22155917.

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In the Long Term Evolution (LTE) system, the Signal Propagation Model (SPM) and the location information of the base stations are required for positioning a smartphone. To this end, this paper proposes a technique for estimating the SPM and the location of the base station at the same time using location-based Reference Signal Received Power (RSRP) information acquired in a limited area. In the proposed technique, multiple Virtual Locations (VLs) for a base station are set within the service area. Signal propagation modelling is performed based on the assumptions that a base station is in each

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Pedersen, Helle A., Nicolas Leroy, Dimitri Zigone, Martin Vallée, Adam T. Ringler, and David C. Wilson. "Using Component Ratios to Detect Metadata and Instrument Problems of Seismic Stations: Examples from 18 Yr of GEOSCOPE Data." Seismological Research Letters 91, no. 1 (2019): 272–86. http://dx.doi.org/10.1785/0220190180.

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Abstract Replacement or deterioration of seismic instruments and the evolution of the installation conditions and sites can alter the seismic signal in very subtle ways; therefore, it is notoriously difficult to monitor the signal quality of permanent seismic stations. We present a simple way to characterize and monitor signal quality, using energy ratios between each pair of the three components, as a complement to existing methods. To calculate stable daily energy ratios over a large frequency range (0.01–5 Hz), we use the daily median energy ratio over all 5 min windows within the day. The

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Oluwole, Ayodele Sunday, Olumayowa Ojo, and Olaitan Akinsanmi. "Received signal evaluation for Ultra High Frequency (UHF)terrestrial television; Case of Ekiti State, Nigeria." Dutse Journal of Pure and Applied Sciences 10, no. 1a (2024): 177–90. http://dx.doi.org/10.4314/dujopas.v10i1a.20.

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This paper presents the evaluation of the received signal for UHF channel 41, (transmitting frequency of 631.25 MHz) and Star-times (transmitting frequency of 618 MHz). Using a Digital Field Strength Meter, the signal strength from the two UHF Transmitting Stations was measured throughout the state along two routes. The elevation, geographic coordinates, and line of sight of the various data points from the base stations were determined using a global positioning system (GPS) receiver. Regression analysis and correlation were used in the signal assessment process. Analysis of the data collecte

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Chen, Ta-Cheng, Sheng-Chuan Wang, and Wen-Cheng Tseng. "Using a Hybrid Evolutionary Algorithm for Solving Signal Transmission Station Location and Allocation Problem with Different Regional Communication Quality Restriction." International Journal of Engineering and Technology Innovation 10, no. 3 (2020): 165–78. http://dx.doi.org/10.46604/ijeti.2020.5054.

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This study aims to investigate the signal transmission station location-allocation problems with the various restricted regional constraints. In each constraint, the types of signal transmission stations and the corresponding numbers and locations are to be decided at the same time. Inappropriate set up of stations is not only causing the unnecessary cost but also making the poor service quality. In this study, we proposed a hybrid evolutionary approach integrating the immune algorithm with particle swarm optimization (IAPSO) to solve this problem where each of the regions is with different ma

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Wu, Zhi Qiang, and Jun Fang Zhao. "The Design of Plate Mills Hydraulic Lubricating and Monitoring System." Advanced Materials Research 1006-1007 (August 2014): 643–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.643.

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Plate mills hydraulic system is made up of several hydraulic stations, lubrication stations and grease stations, these hydraulic stations and lubrication stations are distributed around the mills. Each hydraulic station possesses qualities of successive long working time, high reliability and signal complexity, and it can satisfy diverse demands of high grade pressure or temperature control, etc. This paper is based on these demands, assembling control missions of hydraulic and lubricating stations. Several PLC S7-300 were chosen to match the need of controlling mills hydraulic and lubricating

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Chen, Wen-Tzu, and Chen-Hsun Ho. "Spectrum monitoring with unmanned aerial vehicle carrying a receiver based on the core technology of cognitive radio – A software-defined radio design." Journal of Unmanned Vehicle Systems 5, no. 1 (2017): 1–12. http://dx.doi.org/10.1139/juvs-2016-0011.

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In this paper, we design and make a prototype of an aerial spectrum monitoring system that consists of a ground control station and a four-rotor unmanned aerial vehicle (UAV). This UAV carries a software-defined radio (SDR) receiver to perform spectrum monitoring tasks, including signal strength, frequency occupancy, and signal analysis. A light and low-cost SDR-based dongle consisting of RTL2832U chip and R820T tuner is employed as the monitoring receiver. A global positioning system and an electronic compass system are built on board to report the UAV’s position and direction. The open-sourc

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Jiang, Jinzhong, Runhai Yang, Bin Wang, et al. "Assessing Short‐Term Clock Errors and Drifts of Temporary Seismic Networks Using the Active Airgun Source in Binchuan, Yunnan." Seismological Research Letters 90, no. 6 (2019): 2165–74. http://dx.doi.org/10.1785/0220190098.

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ABSTRACT We conducted a short‐term airgun experiment at the Binchuan Fixed Airgun Signal Transmission Station from 14 to 20 February 2017, and two different types of seismometers (Güralp CMG‐40T and QS05A) recorded 62 airgun shots triggered under the same conditions. However, we observed significant clock errors and drifts in seismic data recorded by four QS05A seismometers. To assess the short‐term clock errors and drifts for seismometers, we propose a new method that measures the P‐wave arrival‐time differences between airgun signals recorded at a station pair, using the matched filter metho

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Zhou, Hui, Yunlong Shen, Ming Chen, Jun Cheng, and Yuting Zeng. "A ROF Access Network for Simultaneous Generation and Transmission Multiband Signals Based on Frequency Octupling and FWM Techniques." Advances in Condensed Matter Physics 2018 (September 2, 2018): 1–9. http://dx.doi.org/10.1155/2018/9409583.

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We report a radio-over-fiber (ROF) access network with multiple high-repetive frequency mm-wave signals generation utilizing a dual-parallel Mach-Zehnder modulator (DP-MZM) and an semiconductor optical amplifier (SOA) for multiple base stations (BSs). In the scheme, at the central station (CS), signal and pump with frequency interval of 8fRF are generated by properly adjusting the parameters of the DP-MZM. After FWM in a SOA, new converted optical signals are obtained. Two tones of the optical signals are selected by using tunable optical filter (TOF), which are then sent into a photodiode (PD

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Wolff, A. M., D. M. Akos, and S. Lo. "Potential radio frequency interference with the GPS L5 band for radio occultation measurements." Atmospheric Measurement Techniques Discussions 7, no. 5 (2014): 4529–50. http://dx.doi.org/10.5194/amtd-7-4529-2014.

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Abstract. New Radio Occultation (RO) receivers are planned to utilize the newly implemented Global Positioning System (GPS) L5 signal centered at 1176.45 MHz. Since there are currently no operational GPS L5 receivers used for space-based RO applications, the interference environment is unclear. Distance Measuring Equipment (DME) and Tactical Air Navigation (TACAN) stations share the same frequency band as the GPS L5 signal. DME/TACAN signals have been identified to be a means of interference for any GPS L5 receiver. This study focuses on implementing a Systems Tools Kit (STK) simulation to gai

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Hansen, Roger A., Frode Ringdal, and Paul G. Richards. "The stability of rms Lg measurements and their potential for accurate estimation of the yields of Soviet underground nuclear explosions." Bulletin of the Seismological Society of America 80, no. 6B (1990): 2106–26. http://dx.doi.org/10.1785/bssa08006b2106.

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Abstract Data on underground nuclear explosions have recently become available from modern digital seismic stations installed within the Soviet Union and China. Observations of root mean square (rms) Lg-wave signals for Soviet underground nuclear explosions at the Shagan River Test Site in East Kazakhstan show that the relative amplitudes of the rms signals at stations in Norway, the USSR, and China are very similar for different explosions, the standard deviation of the differences being only about 0.03 in logarithmic units (i.e., magnitude units). This is consistent with earlier observations

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Amath, NDAO, GAYE Idrissa, Fleury Rolland, SARR Cheikh, and Amory Mazaudier Christine. "Effects of Ionospheric Plasma Irregularities at the Equatorial Zone on GPS Signal." Journal of Scientific and Engineering Research 9, no. 4 (2022): 109–17. https://doi.org/10.5281/zenodo.10519162.

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<strong>Abstract</strong> This paper studies scintillations of the GPS signal in the equatorial zone created by the ionospheric plasma irregularities. RINEX Data resulting from GPS stations located at ±20° from the magnetic equator were used. This study was carried out by considering three GPS stations including the station from Dakar, that of Yamoussoukro and that of Cotonou. They belong to the IGS (International GNSS Services) network. The equatorial zone is one of most impacted areas by ionospheric irregularities causing scintillations of GPS signal which affect the phase measure

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Zhang, Zhaohui, Jing Li, and Qian Liu. "Modified Least Squares Algorithm for Three-Dimensional Target Location Based on Wireless Communication Base Stations." Complexity 2020 (September 2, 2020): 1–10. http://dx.doi.org/10.1155/2020/5879415.

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The observed values of time of arrival (TOA) for the radio signals between the target and the wireless communication base stations are mainly affected by signal non-line-of-sight (NLOS) propagation in target location. TOA with NLOS makes a lot of signal noises and propagation delays, that is, location errors. For the first time, this paper focuses on the problem of modifying the Z-axis location coordinates in three-dimensional (3D) target location. A novel algorithm is proposed by establishing the modified least squares 3D location model for the accurate target location. Meanwhile, an optimal

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Enoch, Sharmini, Ifiok Otung, Naeem Azeemi, and M. A. Habli. "Performance Evaluation of Angular Separation on Cell Site Diversity Gain." GIS Business 14, no. 6 (2019): 717–27. http://dx.doi.org/10.26643/gis.v14i6.15127.

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There have been remarkable advancements in the field of broadband wireless access (BFWA) technologies. These technologies operate in microwave frequencies where rain attenuation is the most important factor leading to signal impairments. The use of cell site diversity (CSD) can help in overcoming the signal fading. During the event of rain, when the signal level falls below a particular threshold, the subscriber station switches to another base station in the coverage area. The CSD gain bears strong correlation with the angular separation between the various base stations. This paper analyses

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Fen, Cao, Yang Xuhai, Li Zhigang, Chen Liang, and Feng Chugang. "Signal Biases Calibration for Precise Orbit Determination of the Chinese Area Positioning System using SLR and C-Band Transfer Ranging Observations." Journal of Navigation 69, no. 6 (2016): 1234–46. http://dx.doi.org/10.1017/s0373463316000205.

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In C-Band transfer measuring systems, the Precise Orbit Determination (POD) precision of Geostationary Earth Orbit (GEO) satellites is limited by signal biases such as the station delay biases, transponder delay biases, the ionospheric delay model bias, etc. In order to improve the POD precision, the signal biases of the Chinese Area Positioning System (CAPS) are calibrated using Satellite Laser Ranging (SLR) and C-Band Transfer Ranging (CBTR) observations. Since the Changchun SLR site and C-Band station are close to each other, the signal biases of the Changchun C-Band station are calibrated

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Mukhin, I. E., A. N. Popov, and A. V. Khmelevskaya. "Scientific and technical ways of reducing quantitative indicators of false alarms during the operation of an airboard radar station on the background of the underlying surface (earth)." Proceedings of the Southwest State University. Series: IT Management, Computer Science, Computer Engineering. Medical Equipment Engineering 14, no. 3 (2024): 157–69. http://dx.doi.org/10.21869/2223-1536-2024-14-3-157-169.

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The purpose of the research is development of scientific and technical ways to reduce the quantitative indicators of false alarms when operating an on-board radar station against the background of the underlying surface (earth) against the background of passive interference.Methods. When conducting scientific research, methods of probability theory, mathematical statistics, statistical radio engineering and computational mathematics were used. The study identified a number of methods and technical solutions based on them that make it possible to increase the efficiency of the functioning of ai

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