一种C/A码互相关干扰消除算法

摘要

C/A码互相关干扰是影响接收机灵敏度提高的关键因素之一,历史文献中提出的互相关干扰消除算法大多不能采用硬件实现,提出了一种用于GPS接收机的互相关于扰消除算法EDPIC法.本算法首先对所有强信号进行搜索,估计所有可见强信号的参数,根据这些参数采用一个通道重建所有的强信号并估计强信号和弱信号对应码间的互相关,并从弱信号自相关结果中去除强信号的互相关干扰,从而达到消除互相关于扰的目的.仿真结果表明在弱信号比强信号弱30dB的情况下,能有效消除强信号对弱信号的互相关于扰.%Cross-correlation of C/A code is one of the key problems which affect improving the sensitivity of the high sensitivity GPS receiver.Most algorithns proposed in the literature publications are too complex to be implemented by hardware.A cross-correlation mitigation algorithm for the global positioning system called extended delayed parallel interference cancellation (EDPIC) is proposed.First strong signals are searched, then the strong signals are reconstructed by a single channel.The cross correlation value between reconstructed strong signals and the local carrier and C/A code of the weak signal is estimated and subtracted from weak signal auto-correlation results.Simulation results shown that the proposed algorithm can mitigate cross correlation well even weak satellite signals are attenuated by 30dB comparing with the strong ones.