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一、问题的提出随着脉冲雷达技术的不断发展,对发射机输出射频脉冲信号的指标提出了越来越严的要求.这些要求大致可归纳为两点:一是波形要方正;二是频谱要纯净.作为脉冲雷达发射机的主要组成部分的脉冲调制器,并不能产生理想的矩形脉冲,特别是线性调制器对产生符合要求的矩形脉冲更是困难.这个缺点不仅会给雷达信号分析系统带来时差域失真,而且还会通过发射管的相位特性,间接地带来频差域失真.因此,必须使调制器输出脉冲达到指标要求.常采用修饰电路(脉冲整形电路),如顶部修饰电路,前沿修饰、后沿修饰电路和反峰修饰电路等.
First, the question raised With the continuous development of pulse radar technology, the transmitter output RF pulse signal indicators put forward more and more stringent requirements can be broadly summarized in two points: First, the waveform to be Founder; Second, the spectrum To be pure pulse pulsar transmitter as the main part of the pulse modulator does not produce the ideal rectangular pulse, especially the linear modulator to produce the required rectangular pulse is more difficult.This shortcoming will not only give radar signal analysis system Bring the distortion of the time-domain distortion, but also indirectly cause the frequency-domain distortion through the phase characteristics of the launch tube.Therefore, it is necessary to make the modulator output pulse meet the requirements of the index.It is often used modification circuit (pulse shaping circuit), such as the top modification circuit , Cutting-edge modification, modification of the circuit along the edge and anti-peak modification circuit.