双伪卫星辅助的惯导误差校正新方法

摘要

针对某些条件下GPS和北斗可能会由于受干扰而不可用的问题,提出一种双伪卫星辅助的惯导误差校正新方法.在伪卫星数目只有两颗时,该方法仍可利用伪卫星的伪距测量序列将惯导的位置误差和接收机钟差估计出来.仿真结果表明,在两颗伪卫星处于载体异侧的条件下,如果惯导的初始位置误差为280 m,则对钟差的估计精度优于110 ns(1σ),对惯导位置误差的估计精度优于70 m(1 σ).%In view of the fact that GPS and Beidou Satellite Navigation System might be jammed under some circumstances, a novel method of INS error rectification aided by double pseudolites is proposed. When there are only two pseudollites, this method can still estimate the position error of INS and clock bias of receivers with the sequence of pseudorange measurenments. Results of simulations show that, when the two pseudollites are deployed in different sides, if the initial position error is 280 m, the precesion of clock bias estimation is better than 110 ns(lσ),the precesion of INS position error estimation is better than 70 m(lσ).