多径干扰下GPS/INS跟踪环路的一种高斯码相位鉴别器

摘要

Code phase error can' t be discriminated by traditional code phase discriminator under the condition of multi-path, a Gaussian Code Phase Discriminator (GCPD) is presented. In the mode of GPS/INS deep integration, the method of building a receiver code phase discriminator is different from traditional idea. The prompt code phase, generated from GPS receiver is used by INS system to create its own code phase discriminator,and then the GCPD is built after GPS receiver code phase discriminator aided by INS code phase discriminator. The code phase tracking error is reduced. The simulation results indicate that the GCPD could minify noise variance, at the same time the phase discrimination accuracy is improved, thus improving position accuracy under the condition of multi-path.%针对载体在多径信号的影响下,传统码相位鉴别器不能实时有效鉴别出码相位误差,提出一种高斯码相位鉴别器构建方法.在GPS/INS深组合模式中,接收机码相位鉴别器的构建将改变传统设计方法.INS系统利用GPS接收机产生的即时码相位信息,建立INS系统码相位鉴别器,该INS码相位鉴别器用于辅助GPS接收机码相位鉴别器,构建高斯码相位鉴别器,有效降低码相位跟踪误差.仿真结果表明,与传统的码鉴相器相比,高斯码相位鉴别器减小了噪声方差,能有效提高鉴相精度,从而在多径干扰下提高定位精度.