脉阶调制器数字控制系统

The Digital Control System of Impulse Ladder Modulator

鉴于目前国内大部分无线电台的短波发射机脉阶调制器控制系统以模拟方式实现的现状,在现有的脉阶调制器技术的基础上对其控制系统进行数字化、智能化改造。基于DSP的短波发射机脉阶调制器数字控制系统采取改进的等效面积法实现PSM+PWM调制。计算机仿真结果表明,改进的等效面积法可以更好地抑制谐波,使输出波形质量得到改善。

At present, a majority of the control systems of impulse ladder modulator of shortwave transmitter are based on simulation mode in China. In this paper, we perform the digital and intelligent reconstruction for the control system of impulse ladder modulator based on the current impulse ladder modulation technique. The digital control system of impulse ladder modulator based on DSP realizes the modulation of PSM and PWM using the method of improved equivalent area. The computer simulation results indicate that the method can suppress the harmonic better and improve the waveform quality.