实时断轨检测技术发送系统设计  

Design of transmission system of real-time broken rail detection

作　　者：刘鹍鹏[1] 张友鹏[1] 赵斌[1] 李军丽[1] 

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070

出　　处：《铁道科学与工程学报》2013年第1期123-128,共6页Journal of Railway Science and Engineering

基　　金：铁道部科技研究开发计划项目(2011J016-C);国家自然科学基金资助项目(51247002)

摘　　要：基于轨道电路原理的一送两受式实时断轨检测技术,以单片机为控制核心,设计了适应长大隧道的实时断轨检测发送系统。采用直接数字频率合成(DDS)技术合成了频率稳定度优于10-4的高精度正弦检测信号,使用自动增益控制(AGC)技术实现了发送端轨面电压的恒压控制。结果表明:设计的系统能够满足实时断轨检测技术对发送系统高精度、高稳定性的要求。Based on the technical of real - time broken rail detection on track circuit of centre fed double side current received type, with microcontroller as its control core, a real-time broken rail detection transmitting system adapted to long and big tunnel was designed. High-precision sinusoid detecting signal whose frequency stability is better than 10-4 was produced by adopting direct digital synthesis （DDS） technology. The constant rail surface voltage on trans-mitting terminal was achieved through utilizing automatic gain control （AGC） technology. The result shows that tbe system can satisfy the requirements for high precision and stability of real-time broken rail detection.

关 键 词：实时断轨检测 发送系统 直接数字频率合成 自动增益控制 

分 类 号：U226.5[交通运输工程—道路与铁道工程]