中文说明：pwm整流器的建模仿真，微分方程组数值解方法，合成孔径雷达（SAR)目标成像仿真，随机调制信号下的模拟ppm，关于超声波倒车雷达测距的，抑制载波型差分相位调制。
English Description：
The modeling and Simulation of PWM rectifier, the differential equations of the numerical solution method, synthetic aperture radar (SAR) target imaging simulation, random modulation signal simulation ppm, about ultrasonic reversing radar ranging, inhibit carrier type differential phase modulation.