卫星信标谐波干扰对跟踪接收机信噪比的影响分析

Influence of Harmonic Interference from Satellite Beacons on Signal-to-noise Ratio of Tracking Receiver

船载卫通站在跟踪圆极化星时,通过频谱监视单元,观察到信标信号附近定时出现干扰谐波,且此时跟踪接收机信噪比下降。针对该问题,提出一种信标频谱分析的方法,从原理上分析干扰谐波对接收机误差电压和信噪比的影响。结果表明:若干扰谐波满足特定频率时会影响误差电压的解调和信噪比值。结合该结论提出方案,降低了干扰对天线跟踪的影响,确保通信业务的正常。

When the ship-borne satellite station tracks the circular polarized star, the interference harmonics near the beacon signal are observed through the spectrum monitoring unit, and the signal-to-noise ratio of the tracking receiver decreases at this time. To solve this problem, a beacon spectrum analysis method is proposed to analyze the influence of interference harmonics on receiver error voltage and signal-to-noise ratio in principle. The analysis results show that the demodulation and signal-to-noise ratio of error voltage will be affected when some interference harmonics satisfy a specific frequency. Combined with this conclusion, a scheme is proposed to reduce the influence of interference on antenna tracking and ensure the normal communication service.