GNSS信号兼容捕获算法

Acquisition algorithm for GNSS multi-constellation signals

目前卫星导航定位系统正在从单一的GPS时代向多星座并存的GNSS时代转移,多星座兼容的卫星导航接收机将会成为未来接收机产品的主流.常用的伪码频域和时域捕获算法,虽可以实现特定系统的伪码信号的快速捕获,但对于处理多个系统、多种调制方式、不同码长的卫星信号而言,尚存在一定的局限性.本文将提出一种应用于GNSS兼容接收机的通用信号快速捕获方法.经实际测试表明,该算法实现了兼容捕获GPS,GLONASS,Galileo和COMPASS等GNSS信号,可以对不同类型的卫星导航信号进行快速捕获,具备较高的实用价值.

Multi-constellation receivers will become popularity since the current satellite navigation systems are transforming from the solo GPS to multi GNSS constellations.The traditional fast acquisition algorithms in time domain and frequency domain for signal of special satellite system have their own shortages.So it cannot process multi-constella-tion signals which modulation and code length are different.A universal fast acquisition algorithm implemented in multi-constellation receiver will be introduced.It has been proved that the algorithm has practical value,and is compatible on acquiring different types of satellite signals,such as GPS,GLONASS,Galileo,and COMPASS,etc.