针对距离采样失配的多波形自适应脉冲压缩  

Multi-waveform adaptive pulse compression for range sampling mismatch

作　　者：裴家正 黄勇 陈宝欣 关键 陈小龙 PEI Jiazheng;HUANG Yong;CHEN Baoxin;GUAN Jian;CHEN Xiaolong(Naval Aviation University,Yantai 264001,China;Academy of Military Science,Beijing 100091,China;Uint 92337 of the PLA,Dalian 116000,China)

机构地区：[1]海军航空大学,山东烟台264001 [2]军事科学院,北京100091 [3]中国人民解放军92337部队,辽宁大连116000

出　　处：《系统工程与电子技术》2023年第7期2031-2042,共12页Systems Engineering and Electronics

基　　金：国家自然科学基金(61871391,U1933135,61871392,62101583,61971432);国防科技基金(2019-JCJQ-JJ-058);山东省高等学校青创科技支持计划(2019KJN026);山东省自然科学基金(ZR202102190211)资助课题。

摘　　要：针对距离单元内调频信号的回波采样点与目标点失配(即距离采样失配)时,引发回波采样波形与参考信号波形之间相位失配以及自适应脉冲压缩性能下降等问题,提出了一种针对距离采样失配的多波形自适应脉冲压缩(multi-waveform adaptive pulse compression,MWAPC)方法。所提方法将多基地自适应脉冲压缩(multistatic adaptive pulse compression,MAPC)方法应用到单基地雷达,首先将单基地雷达的原始发射信号过采样得到多个采样版本的发射信号,并将各种采样版本视为不同的波形;然后借助于自适应脉冲压缩对相位失配的敏感性,依次用不同采样版本的发射信号对回波信号做多波形自适应脉冲压缩构建距离维与采样维的二维输出,得到在距离单元内目标点与采样点的相对位置关系。实验证明,所提方法可根据多个采样版本的采样时序将自适应脉冲压缩的二维输出延展成一维。相比于常规脉压方法,所提方法不仅能抑制因采样失配而产生的距离旁瓣,还可获得超出传统脉压方法的分辨能力,在同一距离单元内区分出不同位置的目标。Aiming at the phase mismatch between echo waveform and reference signal waveform and the degradation of adaptive pulse compression method’s performance when the mismatch between echo sampling point of frequency modulation(FM)signal echo in a range cell is mismatched with the target point(i.e.,range sampling mismatch),a multi-waveform adaptive pulse compression(MWAPC)method for range sampling mismatch is proposed.The algorithm applies the multistatic adaptive pulse compression(MAPC)method to the monostatic radar.Firstly,the original transmitted signal of the monostatic radar is oversampled to obtain multiple sampled versions of the transmitted signal,and various sampled versions are regarded as different waveforms.Then with the help of the sensitivity of adaptive pulse compression to phase mismatch,the different sampled versions of the transmitted signal are utilized to perform multi-waveform adaptive pulse compression on the echo signal,and the two-dimensional output of range dimension and sampling dimension is constructed to obtain the relative position relationship between target point and echo sampling point in a range cell can be obtained.Experiments show that the proposed algorithm can extend the two-dimensional output of adaptive pulse compression into one-dimensional according to the sampling order of the multiple sampling versions.Compared with the conventional pulse compression method,the proposed method not only suppress the range sidelobes caused by range sampling mismatch,but also obtain the resolution which beyond the traditional pulse compression methods to distinguish different targets in the same range cell.

关 键 词：调频信号 采样失配 过采样 自适应脉冲压缩 雷达成像 距离旁瓣抑制 

分 类 号：TN958.2[电子电信—信号与信息处理]