外辐射源雷达距离徙动校正并行实现与实验研究

Parallel implementation and experimental research of range migration correction for passive radar

摘要:

增加相参积累时间是一种提高雷达探测能力的有效方法，但当目标速度较高时，长时间相参积累会导致目标出现距离徙动效应，从而降低了信噪比，影响雷达的探测威力。针对距离徙动问题，本文给出了Keystone变换(KT)校正算法，仿真评估了三种实现KT方法的性能，进而提出并实现了基于图形处理器(GPU)的线性调频Z变换(CZT)并行算法，结合外辐射源雷达实验证实了该方法的实时性和有效性。

Abstract:

Increasing the coherent accumulation time is an effective method to improve radar detection capability. However, when target velocity is high, long-time coherent accumulation will lead to the range migration effect of the target, reduce the Signal-to-Noise Ratio, and affect the radar's detection power. Aiming at the range migration problem, Keystone Transform(KT) correction algorithm is given. The performance of three KT implementation methods are simulated and evaluated. Then, a parallel implementation algorithm based on Chirp Z Transform(CZT) on the Graphics Processing Unit(GPU) is proposed and implemented. Experimental results verify the real-time performance and effectiveness of the proposed method in combination with the passive radar system.