S频段卫星导航信号与临频信号兼容性分析与试验

摘要

分析S频段导航信号与临频信号的兼容性,设计了实际场景下S频段导航信号干扰检测方法和干扰源识别方法.利用在轨卫星播发的S频段导航信号,通过多种场景的测试比对,评估蜂窝通信4G信号和WLAN信号两个临频信号对S频段导航信号的影响程度.测试结果显示,2555MHz~2575MHz频段的4G信号对S频段导航信号存在较为明显的干扰,在当前设计状态下,S频段4G基站以及导航终端还需要进一步研究信号兼容手段,保障S导航频段能够安全使用.%Compatibility of S-band GNSS signal and its adjacent band signals is analyzed based on field test method. S-band GNSS signal interference detection and source identification methods are designed in this test. By using the actual S-band GNSS signal broadcast in Bei Dou system satellites in orbit, the influences of the two adjacent signals which are 4G cellular mobile communication signal and WLAN signal on S-band GNSS signal are analyzed in various scenarios. The results show that, 4G signal in band 2555MHz~2575MHz has obvious interference on S-band GNSS signal, which may cause 10dB degradation in carrier to noise density ratio.