Direct Position Determination Using Asynchronous Observations of Multiple Moving Sensors
FENG Qi① QU Changwen① ZHOU Qiang②
①(Department of Electronic and Information Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China) ②(Scientific Research Department, Naval Aeronautical and Astronautical University, Yantai 264001, China)
A Direct Position Determination (DPD) algorithm based on spatial spectrum analysis for the issue of asynchronous observation in the multiple moving sensors passive fusion location system is proposed. At first, a direct determination mathematical model of the asynchronous scene is constructed and a multiple sensors cooperative spatial spectrum function is composed. Furthermore, the position of the emitter can be got by a two or three dimensional search, and then the derivations of the estimators’ variance and the Cramer-Rao Lower Bound (CRLB) are given. Finally, the Monte Carlo simulations over the asynchronous scene indicate that the accuracy of the proposed method is close to the Cramer-Rao lower bound and superior to the two-step location method based on the location parameters, especially in the low SNR.
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