基于自适应滤波器PN码同步和多普勒频移联合捕获方法

An Acquisition Algorithm Combining the PN Code Synchronization and the Doppler Frequency Shift Based on Adaptive Filters

近年,基于自适应滤波理论的PN码捕获算法受到越来越多的关注。本文将这种思想用于多普勒频移捕获,提出了一种基于频域自适应滤波器的多普勒频移捕获算法,并进一步推导出了PN码和多普勒频移联合捕获算法。另外,针对传统自适应PN码捕获算法会受到调制数据的影响,提出了一种差分自适应算法,解决了调制数据引起的PN码极性翻转问题,提高了自适应滤波PN码捕获的适用性。最后对所提算法进行了仿真验证。

Recently,the PN code acquisition algorithm based on the adaptive filter theory has been more and more studied.Using this idea,a new Doppler frequency shift acquisition algorithm based on adaptive filters in the frequency field is proposed.With the two issues,an acquisition algorithm combining the PN code acquisition and the Doppler frequency shift is followingly derived.In addition,aiming at eliminating the effect of the modulation data on the traditionally adaptive filter PN acquisition algorithm,a differentially adaptive algorithm is introduced,where the effect of polarity reversion caused by data modulation on the PN code is removed,resulting in the applicability spreading of this kind of PN code acquisition algorithm.Finally,the proposed algorithm is validated by simulation.