基于跳频扩频技术的无线CBTC系统的抗干扰能力测试

Anti-lnterference Ability Test of Wireless CBTC System Based on FHSS Technology

分析了轨道交通无线CBTC（基于通信的列车控制）系统的干扰源。对基于跳频扩频技术的无线CBTC系统分别进行了实验室环境模拟测试、试车线环境测试和正线环境验证测试,测试项目包括丢包率、时延及干扰临界状态（干扰源的数量和连接速率）,根据测试结果进行了无线CBTC系统的抗干扰性能分析。测试及分析结果表明,采用跳频扩频技术,在存在大量、甚至超过地铁环境可能存在的极限条件的同频干扰的情况下,无线CBTC系统依然可以保持正常的功能,并不影响运营。共用频段采用跳频扩频技术是无线CBTC系统车地无线通信的一个合适的技术选择。

The interference source of railway CBTC system is analyzed. Simulation test of CBTC system based on FHSS radio communication technology is conducted in lab envi- ronment,testing track environment and mainline environ- ment respectively,including packet loss test, time delay test and interference critical state test. Then the interference performance of wireless CBTC is analyzed based on the test results, which indicate that wireless CBTC can still operate normally in the environment of extreme interference. Thus, the adoption of FHSS in shared frequency is a proper technical selection for CBTC system.