非合作无源探测中的假设检验弱目标检测方法

doi:10.7527/S1000-6893.2015.0100

Abstract

Abstract:

Due to the interference from strong direct signal, multipath signals and echoes from strong sources, it is difficult to detect weak targets in non-cooperative passive detection system. In order to solve this problem, a method for weak target detection based on multiple composite hypothesis test theory is proposed. To begin with, projections of the received signal in a subspace orthogonal to both the strong, direct and multipath disturbance achieve the cancellation of strong, direct signal and multipath signal. Target detection is treated as multiple composite test problem and the corresponding theory frame is built up. Unknown parameters such as delay, Doppler frequency and signal amplitude are estimated using maximum a posteriori criterion for the achievement of test detection statistics. The required threshold is derived and interference from strong targets is degraded and subtractedstep by step according to the results of hypothesis test decision. Finally, simulation results demonstrate that the proposed approach can conduct the cancellation of strong direct signal, multipath and echoes from strong sources and detect very weak target at low false alarm rate.

Key words: non-cooperative passive detection, hypothesis test, maximum a posteriori estimation, weak target detection, false alarm

CLC Number:

TN958.97

YING Tao, HUANG Gaoming, ZUO Wei, SHAN Hongchang, GAO Jun. Weak target detection method based on hypothesis test theory in non-cooperative passive detection[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(2): 626-636.

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Weak target detection method based on hypothesis test theory in non-cooperative passive detection

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