摘要
针对GSM-R光纤分布式系统在无线信号覆盖时存在的同频信号干扰问题,设计了基于VxWorks嵌入式操作系统的信号时延测量和自动补偿方法。首先介绍了系统时延测量的基本原理并给出了计算公式,然后利用VxWorks中任务管理和信号量传递机制完成了系统时延测量和自动补偿设计,最终确保系统在自动时延补偿后可降低同频信号干扰的影响,提高无线通信的质量。实验结果表明,该设计可将系统时延差值补偿至1μs以内,满足实际应用的要求。
Aiming at same frequency disturbance problem in global system of mobile communication for railways（GSM-R） fiber distributed system when wireless signal covering, this paper designs a method of delay measurement and autocompensation based on VxWorks system. Firstly, it introduces fundamental of system delay measurement and calculating formulas. Then it finishes the design of delay measurement and auto compensation using mechanism of task management and semaphore. The purpose of design is to reduce the interference of same frequency and improve the quality of wireless communication finally. The experimental results indicate that this design may reduce the difference value of delay to 1 μs, and satisfies the need of actual application.
出处
《微型机与应用》
2015年第20期72-75,共4页
Microcomputer & Its Applications
