基于北斗系统的伪码捕获技术的研究

北斗卫星导航定位系统是我国自主研发的有源三维卫星定位与通信系统.北斗卫星信号的捕获是北斗用户接收机的关键技术之一,捕获性能的优劣直接影响着北斗导航系统的精度和实时性要求.本文基于北斗系统,在FFT并行捕获算法的基础上研究分析了一种相位补偿和同步块累加的伪码捕获算法,并对该算法的性能进行了分析.理论分析和仿真结果表明,该方案能够大大提高信噪比,提高信号的捕获效率.

Research of code capture technology based on the compass

The Compass is active 3D satellite positioning and communication system of independent research and development in China.The capture of signals is one of the key technologies of BD user receiver,and its capture performance directly affects the Compass accuracy and real-time requirements.In this paper,it analysis a code acquisition scheme based on phase compensation and synchronization blocks accumulation,which is based on FFT parallel acquisition algorithm of the Compass. Theoretical analysis and simulation results show that,this scheme can greatly improve the signal-to-noise ratio and the efficiency of signal acquisition.