移频轨道电路发码装置的研究与设计  

Research and Design of frequency-shift modulated track circuit Code Sending Device

作　　者：杨城 刁艳美 YANG Cheng;DIAO Yanmei(Nanjing Tech University Pujiang Institute,Nanjing 211200,China)

机构地区：[1]南京工业大学浦江学院,南京211200

出　　处：《铁路计算机应用》2023年第9期72-77,共6页Railway Computer Application

基　　金：江苏省第六期"333高层次人才培养工程"项目(2022-2026);2019年“青蓝工程”中青年学术带头人培养基金项目(RCQL19210);2022年江苏省高铁安全工程技术研究开发中心开放基金项目(RCQL22012);南京工业大学浦江学院2022年校级课题自然科学研究类项目(njpj2022-1-19)。

摘　　要：为提高移频轨道电路发码装置输出信号的质量及装置的可靠性,设计一种基于直接数字频率合成器(DDS,Direct Digital Synthesizer)芯片的发码装置。该装置由单片机直接控制DDS芯片产生移频信号,经过后级电路放大滤波后,输出到测试环线上,供车载天线接收;单片机提供RS-485通信电路用来接收上位机的控制数据、有机发光二极管(OLED,Organic Light-Emitting Diode)显示屏和按键,作为便携式设备的人员操作接口。通过测试验证,该装置可精确输出ZPW-2000和FTGS这2种移频轨道电路的移频键控(FSK,Frequency-Shift Keying)调制信号,提高了输出信号的分辨率和精度,从而减小相邻轨道区段间的干扰,便于机车信号设备的解调。与既有的移频轨道电路发码装置相比,该装置具有信号质量高、结构简单、可靠性高、方便操作的优点。To improve the quality of the output signal and the reliability of the frequency shift track circuit code sending device,this paper designed a code sending device based on a Direct Digital Synthesizer(DDS) chip.The working principle of this device was that the microcontroller directly controlled the DDS chip to generate a frequency shift signal,which was amplified and filtered by the later stage circuit,and output to the testing loop for the vehicle antenna to receive;the microcontroller provided an RS-485 communication circuit to receive control data from the upper computer,and organic light emitting diode display screens,and buttons which served as the operator interface for portable devices.Through testing and verification,the device can accurately output frequency shift keying modulation signals of ZPW-2000 and FTGS frequency shift track circuits,improve the resolution and accuracy of the output signal,thereby reduce interference between adjacent track sections and facilitate demodulation of locomotive signal equipment.Compared with existing frequency shift track circuit code sending devices,this device has the advantages of high signal quality,simple structure,high reliability,and convenient operation.

关 键 词：发码装置 机车信号 轨道电路 直接数字频率合成器(DDS) 移频信号 

分 类 号：U284.2[交通运输工程—交通信息工程及控制]