关键词: 高脉冲重复频率, 距离延拓, 距离模糊, 状态估计, 动态规划, 检测前跟踪

Abstract:

Aiming at the issue of range ambiguity, a novel tracking-before-detection (TBD) method based on range extension is proposed for dim target detection with high pulse repetition frequency (HPRF) radars. The proposed method functioning in a staggering multiple pulse repetition frequencies (PRFs) mode preprocesses the MTD-processed data and performs range-extension according to different range ambiguous numbers. The maximum energy of targets is then acquired through the accumulation of energy inside the group of multiple PRFs and of tracking energy between groups. Finally, the track diffusion effect incurred by the dynamic programming algorithm is eliminated using the tracking cohesion strategy, and the tracking of fake targets caused by a low signal to noise ratio is reduced according to the correlation between fake and real targets. The new method improves the detection performance of the dim target without a priori knowledge of the state of the target. Simulation illustrates the effectiveness of the proposed method.

Key words: high pulse repetition frequency, range extension, range ambiguity, state estimation, dynamic programming, tracking-before-detecttion