为解决雷达脉冲压缩通过海明窗、汉宁窗等加权方法降低旁瓣,但引起主瓣展宽、影响雷达分辨率问题,文中提出了一种在保持雷达脉冲主瓣宽度基本不变下抑制雷达脉冲压缩旁瓣的新方法。以线性调频信号为目标信号,以海明窗作为脉压窗函数,通过3阶高斯拟合得到一种新型窗函数。相比于一般匹配滤波方法,该窗函数在脉冲压缩后主瓣不展宽的条件下,可以使脉压输出信号的第一旁瓣峰值下降4 dB。为适应对旁瓣抑制能力有更高要求的情况,通过对该窗函数变量的调节,可以实现对主瓣展宽和峰值旁瓣的灵活调整。研究结果表明:在一定范围内,所设计窗函数的旁瓣抑制能力明显优于凯塞窗,通过多目标的脉冲压缩仿真实验,验证了该窗函数变式在区分两个邻近目标能力的使用效果。

The side-lobe of radar pulse compression could be restrained by weighting methods such as Hamming window and Hanning window, but the main lobe widening and resolution will be affected, so a new method is proposed to suppress the side-lobe of radar pulse compression with main lobe width of radar pulse basically unchanged in this paper. A new type of window function is obtained by three-order Gaussian fitting using linear frequency modulation signal as the target signal and Hamming window as the pulse window function. Compared with the general matched filtering method, 4 dB is reduced of the peak value of the first lobe of pulse pressure output signal, and at the same time, the main lobe is not widened after pulse compression. In order to adapt to some situations with higher demand on the side-lobe suppression ability, the main lobe width and peak side lobe can be flexibly adjusted by adjusting the variable of the window function. The results show that the side lobe suppression ability of the designed window function is obviously better than that of the Kaiser window. The effectiveness of the window function variant in the ability to distinguish two adjacent targets is verified by the pulse compression simulation experiment of multiple targets.

TN958.3

国家自然科学基金资助项目;江苏省双创团队人才计划