Source Localization With Differential Doppler Measurements
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Source Localization With Differential Doppler Measurements
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Author : Peter M. Schultheiss
language : en
Publisher:
Release Date : 1978
Source Localization With Differential Doppler Measurements written by Peter M. Schultheiss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Doppler effect categories.
Multisource Localization From Delay And Doppler Measurements
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Author : B. Friedlander
language : en
Publisher:
Release Date : 1986
Multisource Localization From Delay And Doppler Measurements written by B. Friedlander and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
The estimation of the locations of multiple radiating sources by analysis of passive array measurements is discussed. Computationally efficient, accurate source location estimators are derived based on differential delay and doppler measurements. The measurement of differential delay and doppler is also discussed; and, finally, the optimal tracking of moving sources via dynamic programming methods operating on correlogram and dopplergram data is presented. Keywords include: Localization, Tracking, Source location estimation, TDOA (Time-difference-of-Arrival), Time Delay, RD (Range Difference), Doppler, Spectral Estimation, and Closed-form Estimators.
Radio Emitter Localization Via Doppler Frequency Shifts Using A Single Receiver
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Author : Andrew Rankin
language : en
Publisher:
Release Date : 2021
Radio Emitter Localization Via Doppler Frequency Shifts Using A Single Receiver written by Andrew Rankin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Electronic dissertations categories.
The Doppler effect has been exploited for localization of an electromagnetic interference (EMI) radio source. The differential Doppler (DD) method has been used for many decades. Another method called the direct position determination (DPD) approach showed better performance than the DD method under low signal-to-noise ratio (SNR) environments. The DPD approach uses a single step without Doppler frequency measurement whereas the DD method involves two steps: Step 1 – measurement of Doppler frequency at each receiver (RX); and Step 2 – measurement of the Doppler frequency differences among the RXs. Both DD and DPD employ multiple mobile RXs, e.g., multiple satellites. Launching and managing multiple RXs require significantly higher cost than a single-RX operation. Of course, both DD and DPD methods exploit the Doppler frequency directly or indirectly. This thesis documents research, which attempts to challenge the traditional approach where RXs are physically separated at a significantly large distance to yield better Doppler frequency effects. It covers three novel methods requiring only a single RX. The key idea is to exploit the fact that the Doppler frequency is a function of not only velocity and position vectors but also RX frequency. In other words, the main idea is to have multiple different Doppler frequency effects at a single RX by creating multiple RX frequencies with multiple RX antennas in proximity even if the EMI transmitter (TX) uses a single carrier frequency. For implementation, this new methodology uses multiple frequency mixer intelligent reflection surface (FMx IRS) antennas and a main RX antenna in proximity. To verify the effectiveness of the proposed methods, the EMI TX’s signal is assumed to be either known or unknown. In addition, the research includes simulations using a random search, instead of a computationally inefficient grid search used in DPD, for a faster convergence. Furthermore, this thesis recommends FMx IRS antennas to create a different RX frequency at a different sampling time, e.g., chirp. Finally, this thesis will verify the claims via simulation and Cramér-Rao lower bound analysis.
Fundamentals Of Multisite Radar Systems
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Author : V S Chernyak
language : en
Publisher: Routledge
Release Date : 2018-05-02
Fundamentals Of Multisite Radar Systems written by V S Chernyak and has been published by Routledge this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-02 with Technology & Engineering categories.
This is an original and comprehensive monograph on the increasingly important field of Multistatic Radar Systems. The material covered includes target detection, coordinate and trajectory parameter estimation, optimum and suboptimum detectors and external interferences. The practical problems faced by those working with radar systems are considered - most algorithms are presented in a form allowing direct use in engineering practice, and many of the results can be immediately applied to information systems containing different types of sensors, not only radars. This book is the revised international edition of Chernyak's renowned Russian textbook.
Optimal Source Localization And Tracking From Passive Array Measurements
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Author : Ehud Weinstein
language : en
Publisher:
Release Date : 1982
Optimal Source Localization And Tracking From Passive Array Measurements written by Ehud Weinstein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
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Author :
language : en
Publisher: CRC Press
Release Date :
written by and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Measurement Of The Differential Doppler Shift
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Author : Ehud Weinstein
language : en
Publisher:
Release Date : 1982
Measurement Of The Differential Doppler Shift written by Ehud Weinstein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Classical And Modern Direction Of Arrival Estimation
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Author : T. Engin Tuncer
language : en
Publisher: Academic Press
Release Date : 2009-07-10
Classical And Modern Direction Of Arrival Estimation written by T. Engin Tuncer and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-07-10 with Technology & Engineering categories.
Classical and Modern Direction of Arrival Estimation contains both theory and practice of direction finding by the leading researchers in the field. This unique blend of techniques used in commercial DF systems and state-of-the art super-resolution methods is a valuable source of information for both practicing engineers and researchers. Key topics covered are: Classical methods of direction finding Practical DF methods used in commercial systems Calibration in antenna arrays Array mapping, fast algorithms and wideband processing Spatial time-frequency distributions for DOA estimation DOA estimation in threshold region Higher order statistics for DOA estimation Localization in sensor networks and direct position estimation Brings together in one book classical and modern DOA techniques, showing the connections between them Contains contributions from the leading people in the field Gives a concise and easy- to- read introduction to the classical techniques Evaluates the strengths and weaknesses of key super-resolution techniques Includes applications to sensor networks
Source Localization Using Tdoa With Erroneous Receiver Positions
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Author : La-or Kovavisaruch
language : en
Publisher:
Release Date : 2005
Source Localization Using Tdoa With Erroneous Receiver Positions written by La-or Kovavisaruch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Electronic dissertations categories.
Source localization has been an active research for several years. It has applications in many areas such as geolocation and mobile user location. Various methodologies have been proposed to passively localize an emitting signal source. One of the most popular techniques is to use the Time Difference of Arrival (TDOA) measurements. TDOA localization technique determines the source position by examining the time differences at which the source signal arrives at multiple spatially separated sensors. There are several methods to solve the TDOA source location problem, and two of the widely known methods are the Maximum Likelihood method and the Taylor-series method. Those methods assume that the sensor positions are exactly known, and this assumption may not be the case in practice. The performance of these methods degrades significantly when the receiver positions have error. The estimation of the of the source location with sensor position uncertainty has been investigated for over a decade. While most of the previous research has been conducted on finding the bearing angle or the angle of arrival of multiple sources in the presence of sensor position noise, noise, in this research, the objective is to locate the exact position of a source in three dimensional space using TDOA measurements when there are random errors in the receiver positions. In this research, three methods are proposed to estimate the source position from TDOA measurements when the receiver positions have random errors. The first method is an extended work from Chan and Ho's work. Chan and Ho's method uses two-stage Least Square (LS) minimization. They introduce an auxiliary variable and solve the source position together with the auxiliary variable using linear LS minimization. The information in the auxiliary variable is then included to the location estimate through another LS minimization to improve accuracy. The first method includes the sensor position error power into a weighting matrix and uses it to improve the accuracy of the source location estimate. The second method consists of three steps. The first step is to estimate the source location with the noisy receiver positions. In the second step, the estimated source position is used to reduce the noise in the receiver positions in order to obtain more accurate positions of the receivers. And in the last step, the source is estimated again using the improved receiver positions from the second step. The source location estimate will be more precise due to better knowledge of receiver positions. The second and the third steps can be repeated several times to obtain even more accurate source location. The third method is based on the Taylor-series method and jointly estimates both source and receiver positions simultaneously. Both the first and the second proposed method utilize the weighted LS minimization to obtain the source and receiver positions and do not involve any linear approximation. Hence, they are computationally attractive and do not have the divergence and initialization problems. For the third method, one deficiency is that it requires a good initial solution guess close to the true solution to begin with in order to ensure convergence. In any case, the divergence behavior can often be detected so that reinitialization can be made. This researach also investigates the effect of receiver position errors to the accuracy of source location estimate in terms of the CRLB and the MSE. The observation confirms that the uncertainty in the receiver position did degrade an estimator's performance. In addition, this research also includes the study of the effect of the choice of reference receiver in the presence of unequal receiver noise power. The study indicates that CRLB is independent of the choice of the reference receiver. Nevertheless, the performance of the proposed closed form solutions is affected by choice of the reference receiver in near-field case, but not the far-field case.
Estimation Of Doppler Shift And Differential Doppler Shift
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Author : Peter M. Schultheiss
language : en
Publisher:
Release Date : 1977
Estimation Of Doppler Shift And Differential Doppler Shift written by Peter M. Schultheiss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
This report is concerned with the measurement of frequency (Doppler shift) by a collection of sensors which may be grouped into two or more clusters (subarrays). The signal may be a sinusoid, or it may be a narrowband gaussian process whose center frequency is then the quantity of interest. For much, though not all, of the analysis, it is assumed that the noise is incoherent from sensor to sensor. The signal wavefront is assumed to be perfectly coherent over all sensors, but the angle subtended at the source by the various sensors may be sufficiently large so that differential Doppler shifts cannot be ignored.