高灵敏度GPS和Galileo信号联合捕获方法

针对传统接收机无法同时捕获两种不同卫星系统信号Galileo E1或GPS C/A的问题,该文提出E1和C/A相干联合捕获和E1-C和C/A相干联合捕获两种新算法。基于E1和C/A联合相干捕获算法,利用E1的数据信号和导频信号与C/A进行联合相干捕获,推导出了捕获灵敏度的计算式,实现了对两种信号的同时捕获。采用E1-C和C/A相干联合捕获算法,仅利用E1的导频信号E1-C和C/A进行捕获,简化了联合捕获的推导过程。仿真结果显示,两种联合捕获均比单独捕获E1或C/A的灵敏度高,为新一代GNSS接收机提供了新的卫星信号捕获方法。

A high sensitivity signal joint acquisition method for GPS and Galileo satellite

For the problem that the conventional receiver cannot capture the Galileo E1 signal and GPS C/A signal at the same time in two different satellite systems,this paper gave two new algorithms that are E1 and C/A coherent joint acquisition algorithm and the E1-C and C/A coherent joint acquisition algorithm.The E1 and C/A coherent joint acquisition algorithm used E1 data signal and pilot signal with the C/A to deduce the sensitivity calculation formula and capture the two signals simultaneously.The E1-C and C/A coherent joint acquisition algorithm used only E1 pilot signal E1-C and C/A to simplify the derivation.The simulation result showed that the performance combining two signals had higher sensitivity than using either signal alone.