超高速平台载雷达杂波特性与抑制方法

针对高超声速平台杂波距离走动与多普勒走动导致的传统空时自适应处理方法杂波抑制性能严重下降的问题,首先建立了高超声速平台杂波空时二维模型,并通过分析杂波空时特性,得出与慢速平台相比,杂波走动造成杂波非均匀性增加和多普勒展宽更严重,非均匀性增加和多普勒展宽程度与脉冲积累时间、杂波块位置均有关。最后,提出利用keystone变换校正杂波距离走动,并通过补偿矩阵补偿杂波多普勒增量的杂波抑制方法。仿真结果表明,所提方法能够使杂波抑制凹口变窄,明显提高主瓣区的动目标检测性能。

Clutter properties and suppression method of hypersonic platform radar

Focusing on the poor clutter suppression performance of the conventional space-time adaptive processing (STAP) method caused by range migration and Doppler migration of clutter with hypersonic platform, this paper firstly constructs a bidimensional space-time model of clutter of hypersonic platform and analyzes the clutter properties, which show that the heterogeneous clutter distribution is severer and the Doppler spectrum of clutter is broadened further compared with that of the slow velocity platforms. Furthermore, the heterogeneous distribution and Doppler spread are related to the positions of scatters and the number of pulses. Finally, a clutter suppression method, which corrects the range migration of clutter by keystone transform and compensates the increment of clutter Doppler by compensation matrix, is proposed. Simulation results show that the proposed method can narrow the notch for clutter suppression and obviously improve the detection performance of moving targets in the main-lobe area.