摘要
分析了列车低压电力线网络的信道特性,提出一种扩频载波数字脉冲间隔调制(SSC-DPIM)电力线载波通信系统.采用线性扫频SSC扩频载波对DPIM符号进行编码,引入脉冲前导码作为传输数据块的同步信号以防止差错传播.并采用单片机实现了该SSC-DPIM系统,研制了电力线载波通信接口收发控制器和列车行车状态监控器,使其在呈时变、高信号衰减特性并存在复杂干扰的列车低压电力线网络上实现了理想的通信,对列车各车厢行车信息进行集中监测.
Train power lines provide a readily available and easily accessible network for measurement and control of unit communications within trains. The communication characteristics of passengertrain power line channels are analyzed and found to suffer from highly variable, changing, and unpredictable signaltonoise ratios. Power line transceivers usually operate in environments containing both background and strong impulse noise. To reduce the effects of the power noise and interference, a powerline spreadspectrum carrier communication system using digital pulseinterval modulation (SSCDPIM) is proposed. In the system, a sweptfrequency spreadspectrum carrier is used to generate pulses of the DPIM. A mathematical model to describe the signaling and the data transmission rate of the SSCDPIM system is given. The error ratio performance of the SSCDPIM system is compared with that of the established techniques of powerline communications using both theoretical analysis and experimental results. The SSCDPIM transceiver is implemented by a microprocessor and used successfully in a train fault monitoring system based on power line communications. In the monitoring system, the running parameters of trains such as axle temperature, miles operated, power load, sensor states and so on, are measured on the spot and transmitted into a train signal monitoring center simultaneously by power line channels.
出处
《应用科学学报》
CAS
CSCD
2003年第4期339-343,共5页
Journal of Applied Sciences
基金
广东省教育厅<软件技术>重点实验室研究基金资助项目