摘要
对于星载正侧面阵雷达,地球自转会导致地面杂波的多普勒分布发生展宽,使得杂波协方差矩阵估计不准确,致使空时自适应处理(STAP)的杂波抑制性能下降。针对该问题,本文提出了一种杂波补偿方法。该方法利用星载雷达的轨道参数对地球自转分量进行估计,然后对杂波数据进行多普勒补偿。该方法能够减轻由于地球自转引起的杂波多普勒分布展宽,提高星载杂波抑制性能;当星载雷达存在轨道倾角误差时,该补偿方法依然有效。仿真验证结果验证了本文方法的有效性。
The eartht s rotation widens the Doppler frequency distribution of the ground clutter, and makes the clutter covariance matrix estimation inaccurate. Then it brings a great chal- lenge to the clutter rejection of STAP method in side-looking space-based radar （SBR）. Therefore, a clutter compensation method is proposed to solve the problem. The method measures the earth＇ s rotation by using the SBR orbit parameter, and then compensates the clutter Doppler frequency. The method can mitigate the influence of the clutter Doppler frequency distribution which is widened by the earth＇s rotation and improve the ability of clutter rejection in SBR system. The method can also be efficient when the orbit inclination angle error exists. Finally, the computer simulation results verify the validity of the proposed approach.
出处
《数据采集与处理》
CSCD
北大核心
2011年第4期379-384,共6页
Journal of Data Acquisition and Processing
基金
国家自然科学基金(60736009)资助项目
国家杰出青年科学基金(60825104)资助项目
关键词
星载正侧面阵雷达
地球自转
空时自适应处理
杂波补偿
side-looking space-based radar （SBR）
earth＇s rotation
space-time adaptive pro cessing
clutter compensation
