某机载SAR超宽带LFM波形产生系统性能分析

Performance analysis of UWB LFM waveform generating system for an airborne SAR

提出一种不同于常规脉压的扩展脉压。这种脉压方式可以得到更多的信号信息,为超宽带LFM脉压信号产生系统提供有效的分析手段。首先介绍了扩展脉压的原理,并在工程调试中加以应用。借助这种分析方法确定了某机载SAR超宽带LFM波形产生系统出现成对回波的原因,并分析了载漏和镜频对波形脉压性能的影响,为改善系统性能提供了依据。

The idea of the expanded pulse compression is proposed. Compared with the conventional pulse compression,it can get more information of the signals and provide an effective analysis means for the ultra-wideband（ UWB） LFM waveform generating system. The principle of the expanded pulse compression is introduced,and then it is applied in the engineering debugging. This method helps to find the cause for which the paired echoes are formed in the UWB LFM waveform generating system for an airborne SAR,and the effects of the carrier leak and the image interference on the pulse compression performance of the waveforms are analyzed,which provide the basis for system performance improvement.