摘要
长河系统发播精度的提高对于罗兰C/北斗组合导航系统的定位性能具有重要作用.文章讨论了利用北斗时为长河发播信号定时,以及对发播信号的发播时刻信息进行误差修正.通过对多个AM RA模型进行残差平方和检验,选择AR(2)模型描述发播信号的随机误差,并以K a lm an滤波来补偿误差.实验表明,该方法将长河系统的发播误差减小了约26 ns,在与北斗进行联合三维定位的机载试验中有效地提高了定位性能.
Improving the transmitting precision of Loran-C signals is important for increasing the positioning capability of Loran-C/Beidou integrated navigation systems. In this paper, the timing method for Loran-C signals by the Beidou system and the corresponding correction method for its transmission time error were discussed. The AR（2） model was selected to describe the random error which was then compensated by the Kalman filter. Results demonstrate that the transmission time error of the enhanced Loran-C signal is decreased approximately 26 ns, and the performance of three-dimensional positioning is improved in term of combining the Beidou satellite in experiments.
出处
《测试技术学报》
2008年第2期145-149,共5页
Journal of Test and Measurement Technology
关键词
定时
误差修正
卡尔曼滤波
罗兰C/北斗组合导航系统
三维定位
timing
error correction
Kalman filter
Loran-C/Beidou integrated navigation system
three-dimensional positioning
