高轨环境下微弱导航信号捕获方法研究

高轨卫星星载GPS应用中,星载接收机接收到的GPS信号是极其微弱的,有时甚至是不连续的。因此,研究高轨环境下微弱导航信号的捕获是极其重要的,它是解决高轨卫星星载GPS应用中的一个关键技术。针对高轨环境下导航星可见性差,信号功率低的情况,提出了一种提高导航信号捕获能力的方法,并在理论上进行了分析论证。结果表明:利用此方法能有效地降低环路门限,大大提高了捕获导航信号的能力。

The Research on Acquisition of Weak Signal in Geostationary Orbit Environments

In the application of GPS onboard GEO, the GPS signal which is received by the receiver onboard GEO is very weak, even is hardly received continuously. So it is important to study the acquisition of weak navigational signal in geostationary orbit environments, and it is a key technique to the application of GPS onboard GEO. For the poor visibility of the navigational satellites and the low power of the signal, the paper proposes a new way to improve the GEO's acquisitive performance and validates the method in theory. It demonstrates that using the method is valid to lower the loop's threshold and impove the performance of the acquisition of navigational signal.