Approximate Maximum Likelihood Algorithm for Moving Source Localization Using TDOA and FDOA Measurements |
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Authors: | YU Huagang HUANG Gaoming GAO Jun WU Xinhui |
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Institution: | YU Huagang a,b,*,HUANG Gaoming a,GAO Jun a,WU Xinhui a a College of Electronic Engineering,Naval University of Engineering,Wuhan 430033,China b Marine Communication Technology Institute,Beijing 100841,China |
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Abstract: | A closed-form approximate maximum likelihood(AML) algorithm for estimating the position and velocity of a moving source is proposed by utilizing the time difference of arrival(TDOA) and frequency difference of arrival(FDOA) measurements of a signal received at a number of receivers.The maximum likelihood(ML) technique is a powerful tool to solve this problem.But a direct approach that uses the ML estimator to solve the localization problem is exhaustive search in the solution space,and it is very computationally expensive,and prohibits real-time processing.On the basis of ML function,a closed-form approximate solution to the ML equations can be obtained,which can allow real-time implementation as well as global convergence.Simulation results show that the proposed estimator achieves better performance than the two-step weighted least squares(WLS) approach,which makes it possible to attain the Cramér-Rao lower bound(CRLB) at a sufficiently high noise level before the threshold effect occurs. |
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Keywords: | approximate maximum likelihood(AML) maximum likelihood(ML) source localization time differences of arrival(TDOA) frequency differences of arrival(FDOA) |
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