机载宽带雷达的数据重组空时自适应处理方法  

Data reorganization space-time adaptive processing method for airborne broadband radar

作　　者：冯建婷 王彤[1] 丁军[2] 路彤 FENG Jianting;WANG Tong;DING Jun;LU Tong(National key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;Institute of Information Sensing,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071 [2]西安电子科技大学信息感知集成攻关研究院,陕西西安710071

出　　处：《系统工程与电子技术》2023年第6期1675-1683,共9页Systems Engineering and Electronics

基　　金：国家重点研发计划(2021YFA1000400)资助课题。

摘　　要：机载宽带雷达具有更高的距离分辨率,有利于目标成像或识别。但是,提高分辨率也使目标信号和杂波信号在脉冲间和(或)阵元间距离走动量增加。若采用窄带空时自适应处理方法,则会导致输出信杂噪比严重下降。针对上述问题,提出了一种数据重组空时自适应处理方法。首先,针对待检测速度-角度重组回波数据,使不同脉冲及阵元的目标信号包络对齐;然后,进行距离维数据重组空时处理,并将输出信号作为检验统计量;最后,给出目标角度和速度搜索方法。所提方法降低了相干积累后的目标能量损失,提高了目标检测和杂波抑制性能。仿真实验验证了所提方法的有效性。Airborne broadband radar has higher range resolution,which is conducive to target imaging or recognition.However,higher resolution also makes the range migration between the array elements and/or pulses of the target signal and clutter signal more obvious.If the narrowband space-time adaptive processing is performed,the output signal-to-noise ratio is seriously reduced.To solve this problem,an data reorganization space-time adaptive processing method for airborne broadband radar is proposed.Firstly,the echo data is reorganized according to the velocity-angle to be detected,so that the target signal envelopes of different pulses and different array elements are aligned.Then,the range-dimension reorganization space-time processing is performed,and the output signal is used as the test statistics data.Finally,the target angle and velocity search method are given.This method reduces the target energy loss of coherent accumulation.The performance of target detection and clutter suppression is improved.Simulation results verify the effectiveness of the proposed method.

关 键 词：机载宽带雷达 空时自适应处理 距离走动 数据重组 

分 类 号：TN958[电子电信—信号与信息处理]