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为了简化雷达系统硬件设计和降低成本,可以使用多个窄带成分来合成宽带信号,从而获得满足实际需要的合成距离像。针对合成宽带信号和雷达阵列的特点,详细分析了结合合成宽带信号及传统空域滤波器组情况下所合成距离像的失真原因,指出合成距离像的失真由形状变形和位置平移两部分组成,且这两种失真分别由各个空域滤波器输出幅度和相位的波动所引起。同时,推导出计算对应相位和幅度失真度的理论公式,并由此给出了当合成距离像存在可接受失真时阵列的临界条件。计算机数值仿真结果验证了以上结论。
In order to simplify the hardware design of the radar system and reduce the cost, a plurality of narrow-band components can be used to synthesize a wideband signal so as to obtain a synthesized distance image that meets actual needs. According to the characteristics of the synthesized wideband signal and the radar array, the causes of the distortion of the synthesized distance image combined with the synthesized wideband signal and the traditional spatial filter are analyzed in detail. It is pointed out that the distortion of the synthesized distance image is composed of the shape deformation and the position shift These two kinds of distortions are caused by the fluctuation of the output amplitude and phase of each spatial filter respectively. At the same time, the theoretical formula for calculating the corresponding phase and amplitude distortion is deduced, and the critical condition of the array is given when there is an acceptable distortion in the synthesized distance image. Computer numerical simulation results verify the above conclusion.