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电子学报  2012 

机载雷达极化空时联合域杂波抑制性能分析

DOI: 10.3969/j.issn.0372-2112.2012.07.023, PP. 1429-1433

Keywords: 极化阵列,空时信号处理,杂波抑制,极化空时联合处理

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Abstract:

针对当前机载雷达面临强杂波抑制和微弱目标检测等难点问题,提出了一种极化空时联合处理新方法.该方法充分利用了目标与杂波在极化域、空域和时域(Doppler域)的特征差异,提高了抑制杂波、增强目标的能力.本文首先建立了机载极化阵列雷达接收信号模型和滤波算法模型.其次,利用分辨格思想及特征值、特征向量和功率谱的关系,构建了完全极化情况下杂波协方差矩阵新的等价关系.在此基础上,详细推导了新方法的杂波抑制性能,得到了输出信干噪比(SINR)与空间匹配系数,Doppler匹配系数,极化匹配系数,杂波脊斜率,信噪比(SNR),杂噪比(CNR)等的定量解析表达式.并与空时自适应处理(STAP)进行比较,从理论上分析得到了极化空时处理性能优于空时处理.特别在检测慢速运动目标时,新方法具有较强的稳健性.最后,仿真算例验证了模型的正确性.

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