一种基于DDS技术的2FSK铁道信号发生器  

A 2FSK railway signal generator based on DDS

作　　者：李浚元[1] 郭建强[2] 吕纯[2] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]西南交通大学物理科学与技术学院光电工程研究所,成都610031

出　　处：《信息技术》2016年第8期144-146,154,共4页Information Technology

摘　　要：目前,我国铁道通信频率调制信号仍以二进制键控频移(2FSK)为主,为能够方便地产生2FSK调制信号,文中采用直接数字频率合成(DDS)技术研究设计了一种铁路专用的2FSK信号发生器。该信号发生器以FPGA为开发平台实现DDS模块功能,其输出离散电压信号经AD9708进行D/A转换,最后通过一个7阶椭圆低通滤波器输出正弦信号,同时单片机MSP430149作为整个系统的控制单元,控制信号的发送。所设计系统结构稳定,频率可调,相位连续,操作简单。At present,binary frequency shift keying( 2FSK) is still play the main role in China Railway Communication frequency modulated signal. In order to generate 2FSK modulated signal easily,the direct digital synthesis( DDS) technology is used to research on a 2FSK signal generator for the railway.Using FPGA,this signal generator realizes the function of the DDS module,and the DDS's output,a discrete voltage signal is D / A converted by AD9708,the final output through a 7th-order elliptic low-pass filter becomes a sinusoidal signal. While the microcontroller MSP430149 acts as the control unit in the entire system,controlling transmit signals. The system designed in this article has some strong points,such as a stable structure,adjustable frequency,phase continuous and simple operation.

关 键 词：2FSK 信号发生器 DDS技术 FPGA 单片机 

分 类 号：TN791[电子电信—电路与系统]