Keystone变换对空时自适应处理性能的影响分析  

Analysis of the Effects of Keystone Formatting on Space-Time Adpative Processing

作　　者：贾琼琼[1] 吴仁彪[1] 李海[1] 

机构地区：[1]中国民航大学智能信号与图像处理天津市重点实验室天津300300

出　　处：《信号处理》2013年第12期1624-1631,共8页Journal of Signal Processing

基　　金：国家自然科学基金(No.61231017,No.61071194,No.U1233109);国家科技支撑计划课题(No.2011BAH24B12)

摘　　要：高速平台检测高速空中动目标面临严重的杂波和目标距离走动,如何有效校正距离走动是目标检测的根本。本文首先研究雷达处于高速平台时keystone变换校正空中动目标距离走动的同时对杂波特性的影响,进而分析其对空时自适应处理(Space-time adaptive processing,STAP)的影响。通过研究表明:当目标不存在多普勒模糊时,keystone变换可同时校正目标和杂波的距离走动,从而为取得良好的STAP性能提供了前提;当目标存在多普勒模糊时,keystone变换校正目标距离走动的同时会使杂波部分产生新的走动分量,最终降低STAP性能。分析结果为如何更好地实现高速平台高速空中动目标检测问题提供了理论参考。Range walk of clutter and target are the most serious problems when detect high speed target form high speed platform. So, range walk compensation are needed for better detection result. Keystone formatting is widely used for range walk compensation because of its capable of compensating multiple targets＇ range walk simultaneously without a prior knowledge on the motion parameters. The effects of keystone formatting on the clutter distributions and on the performance of STAP are studied in this paper. We concluded that keystone formatting can compensate the range walk of both the target and clutter when the target is ambiguity-free. However, when the target is Doppler ambiguous, range walk compensation of the target by keystone formatting induces new range walk to the clutter, which will affect the distribution of the clutter and further degrade the STAP performance. The above conclusions are helpful in deriving better methods for the detection of fast air moving targets on high speed platform.

关 键 词：机载 星载雷达 KEYSTONE变换 空时自适应处理 动目标检测 杂波走动 

分 类 号：TN957[电子电信—信号与信息处理]