CTCS-3级列控系统无线通信系统链路质量检测方法

The Link Quality Test Method of the Wireless Communication System Based on CTCS-3 Level Train Control System

根据GSM-R无线通信系统的特点,综合考虑场强覆盖测试和电磁环境评估问题,提出1种基于信号统计特性的无线链路质量检测方法。利用本地均值估计算法确定采样间隔、统计区间长度和采样点数,并计算本地场强均值;利用干扰分析方法从本地场强均值中提取有用信号强度和干扰信号强度,其中有用信号强度用于场强覆盖测试,干扰信号强度用于电磁环境评估。通过理论推导和仿真分析可知,采样间隔越小,统计误差越小。干扰分析方法能够根据接收信号强度计算出干扰信号强度的数量级、实际信号强度和不同频点的干扰源数目。

According to the characteristics of GSM-R wireless communication system,a test method for the wireless link quality based on the signal statistical characteristics was proposed by comprehensively taking account of the field strength coverage test and the electromagnetic environmental assessment.The local mean estimation algorithm was adopted to determine the sampling interval,the length of the statistical interval and the number of the sampling points so as to gain the local mean field strength.The interference analysis method was used to extract the useful signal intensity and the interference signal intensity from the local mean field strength.In which,the useful signal intensity was used to test the field strength coverage and the interference signal intensity was used to evaluate the electromagnetic environment.It is known from the theoretical deduction and the simulation analysis that the shorter the sampling interval is,the less the statistical error is.The interference analysis method can calculate the magnitude of the interference signal intensity,the intensity of the practical signal and the number of the interference source at different frequency point according to the intensity of the received signal.