摘要
提出了一种适用于机载多通道SAR-GMTI系统的通道均衡方法。采用功率挑选准则剔除强运动目标污染,从参考通道和待均衡通道中选取一组高相关回波作为均衡器输入,在用N阶FIR滤波器拟合均衡器时采用对角加载技术解决病态矩阵影响。理论分析表明,在杂噪比很低的条件下,该均衡器响应也能逼近于实际通道间失配误差,且将接收机和馈线失配一起均衡,无需改装现有系统。仿真实验进一步验证了该方法的有效性。
A new method for equalizing channel mismatch based on echo data in airborne SAR-GMTI system is proposed. The method clears up the contamination of target signal by power selection principle, then a pair of highly correlated echoes is selected from the reference and under equalization channels to be taken as the input signal of the equalizer, and the method of diagonal loading is used to solve the matrix＇ s morbidity. Theory analysis shows that the estimated equalizer approaches the practical mismatch errors even though the clutter to noise ratio is low. Furthermore it can equalize the mismatch of the receiver and the transmission line simultaneously without refitting the radar system. The results of the simulation indicate the efficiency of the method.
出处
《现代防御技术》
北大核心
2015年第4期190-195,225,共7页
Modern Defence Technology
基金
航空科学基金(20145596025)
