窄带干扰信号对北斗三号B2信号质量的影响

北斗三号全球卫星导航系统正式开通, 面对空间电磁环境日趋复杂, 地面接收信号功率微弱等问题, 强干扰下的B2新信号, 对信号质量提出新的挑战及更高的要求。对此, 建立了B2信号及窄带干扰信号模型, 仿真分析窄带干扰信号在不同中频、带宽、干信比条件下对信号功率谱偏差、相关损耗、S曲线过零点偏差的影响, 并用实测信号进行验证。研究结果表明, 窄带干扰信号参数变化对信号质量影响较大, 干扰环境恶劣时, 信号质量明显变差, 导致伪距测量误差较大, 影响用户定位精度。研究成果可为干扰监测评估及信号质量评估提供参考依据。

Impact of narrowband interference on the BDS-3 B2 signal quality

Since the BeiDou navigation satellite system (BDS-3) was officially launched, and as the space electronmagnetic environment is becoming increasingly complex, and the received signal power is weak, the new B2 signal under strong interference poses new challenges and higher requirements for signal quality. The paper simulated the B2 signal and narrowband interference signal models, analyzed the effects of narrowband interference on power spectrum deviation, correlation loss and S-curve biases (SCB) under different parameters, such as intermediate frequency, bandwidth, and the jamming to signal ratio (JSR). And the real signal data collected by the 40-meter antenna system was used for verification. The results of the study show that the variation of interference signal parameters has a significant impact on the signal quality, and the signal quality deteriorates significantly when the interference environment is harsh, leading to large pseudorange measurement errors and affecting user positioning accuracy. The research results of this paper provide a valuable reference for interference monitoring assessment and signal quality assessment.