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提出一种新型超宽带雷达高斯脉冲信号产生电路的设计方法,该电路利用微波三极管的开关特性和阶跃恢复二极管的阶跃特性,以及电容的充放电过程产生高斯脉冲信号,利用ADS软件对脉冲产生电路进行了仿真与分析。测量结果表明,该电路可以产生脉冲宽度400ps,重复频率1MHz,幅度4.1V的窄脉冲信号,且脉冲振铃很小,与仿真结果基本吻合,从而验证了该方法的合理性。该电路通过调节充放电电容的值实现脉冲幅度可调,当重复频率提高至10 MHz时,可得到3V～8V的幅度可调皮秒级高斯脉冲。该脉冲源能够满足超宽带雷达系统不同的应用要求。
A new design method of Gaussian pulse signal generation circuit for ultra-wideband radar is proposed. The circuit uses the switching characteristics of the microwave transistor and the step characteristics of the step recovery diode and the Gaussian pulse signal during the charge-discharge process of the capacitor. By using ADS software, Generated circuit simulation and analysis. The measurement results show that the proposed method can produce a narrow pulse signal with a pulse width of 400ps, a repetition rate of 1MHz and a amplitude of 4.1V, and the pulse ringing is small, which is in good agreement with the simulation results. The circuit adjusts the value of the charge-discharge capacitor to achieve the adjustable pulse width. When the repetition frequency is increased to 10 MHz, the amplitude adjustable picosecond Gaussian pulse of 3V ~ 8V can be obtained. The pulse source can meet the different application requirements of UWB radar system.