天基TDM-MIMO雷达空间碎片阵列走动补偿方法研究

Research on compensation method of space debris array walk for space-based TDM-MIMO radar

天基时分复用多发多收天线(TDM-MIMO)雷达能同时完成较大空域搜索和多目标跟踪任务,有利于实现对多个碎片同时跟踪,且系统架构简单,能够以较小代价获得更多的系统自由度。但由于空间碎片与雷达间的相对高速运动,目标回波信号由窄带阵列信号变成宽带阵列信号,均匀线阵畸变成相对阶梯形阵列,无法实现能量聚焦。为了解决以上问题,提升TDM-MIMO雷达的综合探测能力,提出一种空间非均匀阵列校正补偿算法,该方法首先利用keystone变换校正阵列在时间域上的走动,进而将不同通道的数据进行重组,最后通过动目标检测(MTD)实现能量聚焦。此时能够在较低信噪比下分辨目标,从而实现动目标检测。理论分析和仿真结果表明所提方法的有效性,且具有较强的工程应用价值。

The space-based TDM-MIMO radar can simultaneously complete larger airspace search and multi-target tracking tasks,which is conducive to simultaneous tracking of multiple debris,and the system architecture is simple,which can obtain more system freedom at a small cost.However,due to the relatively high-speed movement between the space debris and the radar,the target echo signal changes from a narrowband array signal to a broadband array signal,and the uniform linear array is distorted into a relatively stepped array,which cannot achieve energy focusing.In order to solve the above problems and improve the comprehensive detection capability of TDM-MIMO radar,the article proposes a spatial non-uniform array correction and compensation algorithm.The method first uses the keystone transform to correct the movement of the array in the time domain,and then reorganizes the data of different channels.And finally achieve energy focusing through MTD algorithm.At this time,the target can be distinguished at a lower signal-to-noise ratio,thereby realizing moving target detection.Theoretical analysis and simulation results show that the proposed method is effective and has strong engineering application value.