岸基多通道雷达仿机载海杂波测量与分析方法

The sea clutter measurement and analysis method of aircraft motion emulation based on shore-based multichannel radar

为充分研究和认知海杂波空时二维特性,提出了基于岸基多通道雷达模拟实现机载平台运动功能的海杂波测量方法,并提出了相应场景下测量数据特性分析方法.通过逆相位中心偏置技术,实现岸基多通道雷达收发相位中心随脉冲重复周期移动,使得海杂波数据具备空时二维耦合特性,且利用测量数据中相参脉冲随雷达多通道数目周期变化特点,实现单距离单元对应海杂波空时特性表征量的精确估计.实测数据结果表明,基于提出的特性分析方法得到的海杂波抑制效果优于传统方法,在非主瓣杂波区域信杂噪比损失优于传统2 dB,抑制后剩余杂波的平均距离-多普勒改善1 dB.基于岸基多通道雷达开展模拟机载平台运动场景下的海杂波测量试验,具有测量简单、成本低、获取样本数据量大等优点,且利用多通道雷达海杂波特性分析方法开展海杂波空时特性研究,大大提高了特性分析精度.

In order to deeply study and understand the space-time two-dimensional characteristics of sea clutter,a sea clutter measurement method based on shore-based multi-channel radar used for airborne platform motion emulation,as well as a characteristic analysis method of the measurement data in the corresponding scenario.With the technique of the inverse displaced phase center antenna,the shore-based multichannel radar shift the transceiver phase center with the pulse repetition period,which leads to the sea clutter data with space-time two-dimensional coupling characteristic.Meanwhile,the coherent pulses in the measurement data vary periodically with the number of radar channels,this feature can be used for the accurate estimation of the space-time characteristics of sea clutter of a single range cell.The results of the measured data show that,the sea clutter suppression obtained by the treatment proposed in this paper is better than the conventional method.The loss of signal-clutter-noise-ratio(SCNR)in the side-lobe region is better than 2 dB,and the average range-Doppler spectrum of the remaining clutter after space-time suppression is improved by 1 dB.The shore-based multichannel radar to carry out sea clutter measurement experiments under simulated airborne platform motion scenarios,which has the advantages of simple measurement,low cost and large amount of sample data acquisition.At the same time,the research of sea clutter space-time characteristics has greatly improved the accuracy of the characteristic analysis,which using a multichannel radar sea clutter characteristic analysis method.