基于EKF载波跟踪环路的INS辅助性能分析

摘要

针对采用传统方式进行惯性导航系统(INS)辅助载波跟踪环路时,辅助性能取决于INS自身精度的问题,提出了基于扩展卡尔曼滤波(EKF)的INS辅助载波跟踪环路的结构.对载波跟踪环路和INS辅助载波跟踪环路的结构进行介绍,分析了影响载波跟踪精度的因素,对基于EKF的环路结构和滤波器模型进行设计.通过仿真验证,基于EKF的INS辅助跟踪环路结构,能够抑制载波相位跟踪偏差的噪声,提高INS对载波环路的辅助性能,降低辅助环路对INS精度的依赖.%In the traditional INS- assisted- based carrier tracking loop, the problem is that the assisted performance is determined by the precision of INS. The architecture of INS assisted carrier tracking loop based on the EKF is proposed to solute the previous problem in this paper. The architecture of carrier tracking loop and INS-assisted carrier tracking loop are introduced, the factors influencing the tracking accuracy are analyzed, and the EKF-based loop architecture and the filter model are designed. The simulation results show that, the INS-assisted carrier tracking loop based on the EKF can suppress the noises of the carrier phase tracking errors, improve the assist performance of INS for carrier loop, and lessen the dependence on the precision of INS.