一种基于通信卫星信号转发的卫星导航信号增强方法
doi: 10.11999/JEIT140672
A Method for the Navigation Satellite Signal Enhancement Based on the Signal Retransmission by the Communication Satellite
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摘要: 该文提出一种利用地球同步轨道(GEO)通信卫星信号转发实现卫星导航信号增强的方法。在信号发射端，利用卫星导航信号直接序列扩频(DSSS)的低功率信号特性，在满足一定通信信号误码率(BER)要求的前提下，将导航中心产生的功率受控弱卫星导航增强信号在所选GEO卫星通信频段上进行载波调制与转发。而在接收端，利用频移(FRESH)滤波器以及一定的自适应信号抵消算法，可有效去除强通信信号的干扰并分离出弱卫星导航增强信号。仿真结果表明，对于分离出的弱卫星导航增强信号，在其对应的功率控制范围内可具有较好的跟踪与捕获性能，由此也验证了所提方法的有效性。
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关键词:
- 全球卫星导航系统 /
- 信号转发 /
- 地球同步轨道通信卫星 /
- 导航信号增强 /
- 频移滤波器
Abstract: A method based on the signal retransmission by the Geostationary Earth Orbit (GEO) comsat for the navigation satellite signal enhancement is proposed. At the signal transmitting side, utilizing the property of low power density of the Direct Sequence Spread Spectrum (DSSS), the power-controlled weak DSSS navigation signal, which is generated at the navigation center, can be modulated and retransmitted on the frequency band of the GEO comsat under the proper Bit Error Rate (BER) requirement of the communication signal. While at the receiving side, with the FREquency-SHift (FRESH) filter and a given adaptive signal cancellation algorithm, the strong communication signal can be well cancelled and thus the weak navigation enhanced signal is separated. The simulation results show that for the separated navigation enhanced signal, a relatively good acquisition and tracking performance can be got in its controlled power range, and this also verifies the effectiveness of the proposed method. -
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