OTHR短CIT条件下自适应舰船目标检测方案

针对在短相干积累时间（CIT）条件下，天波超视距雷达（OTHR）的多普勒频率分辨力和相干积累处理增益降低，导致对低可探测大中型舰船目标检测性能下降的问题，提出一种综合自适应海杂波抑制、重构并检测舰船目标信号的PHM方案。该方案首先利用峰值信噪比（PSNR）-高阶奇异值分解（HOSVD）算法进行自适应海杂波抑制，使信号稀疏化并减少后续检测环节中的虚警；然后利用改进的正交匹配追踪（MOMP）算法进行重构和检测舰船目标信号，改善对目标的检测性能，并提升检测结果中舰船目标的多普勒频率准确度。仿真分析和实测数据处理结果验证了PHM方案的有效性。 

Adaptive Detection Scheme of Ship Targets for OTHR with Short CIT

To solve the dilemma that the poor Doppler resolution and coherent processing gain reduces the performance of ship detection in skywave over-the-horizon radar (OTHR) systems with short coherent integration time (CIT), a detection scheme called PHM that synthesize adaptive sea clutter suppression and ship target signal reconstruction and detection is proposed. The PHM scheme suppresses sea clutter by using the algorithm of peak signal-to-noise ratio (PSNR)-high-order singular value decomposition (HOSVD) firstly. Thus, the signal becomes sparse, and the false alarms in the following detection step are to be greatly reduced. Than the PHM reconstructs and detects the signal component of ship targets simultaneously. Thus, both the detection performance of low detectable large and medium ship targets and the accuracy of target Doppler frequency in the results of detection are improved. The simulation analysis and processing results of measurement data verified the validity of the PHM scheme.