Abstract: With the large-scale popularization and application of the STP-yh radio shunting cab signal and monitoring system, the pressure of the STP-yh system in management, maintenance and emergency handling of faults has become increasingly prominent. Through the analysis of Fresnel radius in the theory of radio electromagnetic wave transmission, combined with the actual situation of STP-yh system, this paper gets several important factors that affect the radio transmission performance of STP-yh system. Therefore, it provides theoretical basis for STP-yh system in the aspects of pre-research, vehicle and ground antenna installation and fault handling, etc., and puts forward several improvement suggestions to ensure the safe and stable operation of STP-yh system.

Key words: STP-yh radio shunting cab signal and monitoring system, radio communication, electromagnetic wave, Fresnel radius, antenna

摘要： STP-yh无线调车机车信号和监控系统大面积推广应用，STP-yh系统在管理维护以及故障应急处理方面的压力日益凸显。通过对无线电磁波传输理论中的菲涅尔半径的分析，结合STP-yh系统运用中的实际情况，得出影响STP-yh系统无线传输性能的几点重要因素。据此对STP-yh系统在前期调研、车载和地面天线安装、故障处理等方面提供理论依据，并提出几点改进建议，保障STP-yh系统安全稳定运行。

关键词: STP-yh无线调车机车信号和监控系统, 无线通信, 电磁波, 菲涅尔半径, 天线