针对小时宽带宽积线性调频信号脉压距离旁瓣高、信噪比损失大的问题,提出了一种脉压失配滤波器优化设计方法。该方法对脉压峰值旁瓣电平、信噪比损失、主瓣展宽指标进行联合控制,采用凸优化算法设计失配滤波器,实现在较低信噪比损失下获得低峰值旁瓣电平,同时具有较宽的多普勒容限。计算机仿真结果验证了该方法的有效性, 与常用的海明窗法相比, 该方法设计的脉压滤波器旁瓣抑制效果和信噪比损失均得到了较大改善,较好地满足了工程应用的要求。

In order to solve the problems of high sidelobe level and signal-to-noise ratio of pulse compression for linear frequency modulation signal with small time-bandwidth product, a new method to design optimized mismatched filter is proposed. In this method, peak-sidelobe level, loss of signal-to-noise ratio and main-lobe widening are jointly controlled, and optimized mismatched filter is designed using convex optimization algorithm to achieve lower peak-sidelobe level under lower loss of signal-to-noise ratio, with wide Doppler tolerance simultaneously. This method is demonstrated to be effective by computer simulation, which shows that the new optimized mismatched filter can get much better sidelobe suppression effect and signal-to-noise ratio compared with the Hamming window method,and can primely meet the requirements of engineering application.

TN957.51