磁悬浮车地通信中频调制器的设计与实现

Design and Realization of an Intermediate Frequency Modulator for Communication System of Maglev Train

从38 GHz磁悬浮车地通信系统要求和FSK调制的原理出发,分析了连续相位频移键控（CPFSK）信号的特征,通过简单、实用的锁相调制技术实现了CPFSK调制方案。该调制器已成功用于38 GHz磁悬浮车地通信系统中,实现了对速率最高达15 Mb/s的数据和周期为1 ms,脉宽10~12μs的报头脉冲信号的调制,取得了良好的效果。

Basing on the requirement of the 38GHz communication system for maglev train and the theory of FSK, we analyze the character of CPFSK signal in this paper and design a practical and easily realized CPFSK modulator with the PLL. The modulator now is using in the 38GHz communication system for maglev train. It can modulate the data signal which is up to 15Mbps and a synchronous pulse which period is lms and pulse width is 10-12 μs, And it gets a good performance.