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Dechirp(去调频)及频谱分析是大带宽线性调频信号的一种常用处理方式,在高分辨率雷达,如合成孔径雷达和逆合成孔径雷达中得到广泛应用。Dechirp处理的一个优点是可以降低输入信号的带宽,从而减小了接收机中A/D变换器在变换速度上的压力。本文的目的是分析、研究经Dechirp及频谱分析而得到的两点目标间的分辨率与匹配滤波得到的两点目标间的分辨率之间的关系;说明了从时域上看,如何从概念上理解在时宽一定的条件下,调频率越大,经Dechirp及谱分析处理后的目标间分辨率也越高。文中还通过仿真说明了Dechirp及频谱分析技术的目标分辨特性。
Dechirp and spectrum analysis are common ways of handling large bandwidth chirp signals and are widely used in high-resolution radars such as synthetic aperture and inverse synthetic aperture radars. One advantage of Dechirp processing is the ability to reduce the bandwidth of the input signal, thereby reducing the pressure on the A / D converter in the receiver at slew rates. The purpose of this paper is to analyze and study the relationship between the resolution between two points obtained by Dechirp and spectral analysis and the resolution between two points obtained by matched filtering. On the understanding of the time-width under certain conditions, the greater the frequency modulation, after Dechirp and spectral analysis of the target resolution between the higher. The article also shows the target discrimination characteristics of Dechirp and spectrum analysis technology through simulation.