论文部分内容阅读
飞行器再入过程产生等离子体,等离子体中电子密度的变化对电磁波信号造成幅度衰减和相位偏移,严重时导致通信中断。理论分析了等离子体对GPS信号载噪比的影响;利用实验室环境下的等离子体模拟装置,设计了GPS二键相控(BPSK)调制信号透过等离子体的地面模拟方案,进行了等离子体对GPS接收机性能影响的实验研究,获得了不同电子密度下的衰减和导航信号载噪比的数据。实验结果与理论分析一致,不仅证明了等离子体下衰减与导航信号载噪比的变化是一致的结论,而且验证了实验方法的有效性。
Plasma re-entry process aircraft, plasma density changes in the electromagnetic wave signal amplitude attenuation and phase offset, resulting in serious communication interruption. The influence of plasma on the carrier-to-noise ratio of GPS signal was analyzed theoretically. By using the plasma simulator in laboratory environment, a ground-based simulation scheme of GPS two-key phase modulation (BPSK) modulated signal through the plasma was designed and the plasma The experimental research on the performance of GPS receiver has obtained the data of attenuation and navigation signal to noise ratio under different electron density. The experimental results are consistent with the theoretical analysis. It is not only proved that the attenuation under the plasma is consistent with the change of the carrier-to-noise ratio of the navigation signal, but also verifies the effectiveness of the experimental method.