多通道解模糊技术中的关键问题研究

基于多通道频谱重构的方位解模糊技术是解决星载合成孔径雷达成像中方位分辨率和成像幅宽之间矛盾的重要方法。文中在多通道频谱重构原理的基础上,分析了为实现频谱重构,信号带宽、采样频率及通道数之间应满足的定量关系,提出了通过加窗处理的方法抑制冗余频谱周期对频谱重构的干扰,分析了通道间距对频谱重构结果的影响,并利用延时错位选取成像的脉冲的方法减小了通道间距对重构频谱的影响。通过上述多通道频谱重构中的关键问题的研究,为该技术应用于工程实践奠定了基础。

A Study on Key Problems in Multichannel Defuzzification

Azimuth defuzzification technique based on multichannnel spectrum reconstruction is an important way to solve the contradiction between azimuth resolution and imaging range of synthetic aperture radar. Based on the principle of multichannnel spectrum reconstruction, the quantitive relationship of the bandwidth, sampling frequency and channel number to realize the spectrum reconstruction is identified, a window-processing method to depress the interference on the spectrum reconstruction by the redundant spectrum is proposed, moreover, the impact on spectrum reconstruction resulting from the channel spacing is analyzed and a method of delaying misplacement is introduced to reduce the impact. Through the research of key problems in multichannnel spectrum reconstruction, this paper laid the foundation for this technique to be used in practical.