作　　者： ; ; ; ; ;

机构地区： 西安电子科技大学电子工程学院雷达信号处理国家重点实验室

出　　处： 《电子学报》 2009年第9期1982-1988,共7页

摘　　要： 在实际的机载多通道雷达系统中,由于存在系统幅相误差和载机的非平稳运动,DPCA条件很难满足而导致杂波抑制性能下降.本文通过预滤波处理补偿了载机的运动误差,同时保证了运动目标信号的损失尽可能小,进而可以采用传统的自适应DPCA技术补偿系统的幅相误差.然而,当样本中存在强的运动目标时,自适应DPCA的权值估计偏差较大导致杂波抑制性能下降.针对该问题,从最大信噪比准则出发,提出了稳健的两通道自适应DPCA杂波抑制方法.在性能分析中,研究了预滤波对运动目标的影响,给出了预滤波后运动目标的相消曲线.最后通过实测数据和仿真目标实验,验证了本文方法的有效性. In the actual system for multi-channel airborne radar,the DPCA requirement is difficult to be satisfied and thus the performance of clutter suppression is degraded,because the amplitude/phase errors of the system and the nonsteady movement of the aircraft cannot be avoided.The prefilter technique is proposed to compensate the movement errors of the aircraft,and it guarantees that the loss of the signal of moving targets be as little as possible.Subsequently,the traditional adaptive DPCA technique can be used to compensate the amplitude and phase errors of the system. Unfortunately, when there exist strong moving targets in the sam- pies, the adaptive weight evaluated deviates from the optimum weight greatly, and thus the performance of clutter suppression is de- graded. To deal with this problem, a robust dual-channel adaptive DPCA method for clutter suppression is proposed based on the cfl- teflon of maximum signal-to-noise ratio. Then we analyze the influence of the prefilter on the moving targets, and provide the cancellation curve of the moving targets after the prefilter processing. Finally, the effectiveness of the method proposed is validated by the experiments of measured data and simulated targets.

关 键 词： 机载多通道雷达 误差补偿 杂波抑制 目标响应曲线

领　　域： [电子电信] [电子电信]