基于FIR滤波的GPS动态变形多路径效应提取研究
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摘要
在GPS动态变形监测中,监测结果包含多种GPS误差,其中大部分误差如对流层误差能通过差分技术消除,而多路径、观测噪声等GPS误差不能通过差分技术消除,这部分误差中多路径误差是主要误差源。本文提出利用FIR滤波,基于GPS卫星轨道周日重复特性,提取GPS动态变形监测中的多路径误差。通过模拟实验,论证了FIR滤波提取多路径误差的有效性,并在动态变形监测实验中,通过自适应的FIR滤波有效提取出GPS多路径误差,建立了多路径误差的周日重复模型。
GPS dynamic deformation monitoring results contains a variety of GPS errors,of which most of the errors,such as the tropospheric error can be eliminated by the difference technique. However,the multipath and observation noise can't be eliminated by the difference techniques,and the multipath error is the main error source. In this paper,FIR filtering is used to extract the multipath errors in the dynamic deformation monitoring of GPS based on the repetitive characteristics of GPS satellite orbit. Designing a simulation experiment to demonstrates the effectiveness of the adaptive filtering in extracting the multipath error. Finally,the adaptive filter is used in the dynamic deformation monitoring experiment to extract the GPS multipath error effectively,and the dairy repetition model of multipath error was established.
GPS dynamic deformation monitoring results contains a variety of GPS errors,of which most of the errors,such as the tropospheric error can be eliminated by the difference technique. However,the multipath and observation noise can't be eliminated by the difference techniques,and the multipath error is the main error source. In this paper,FIR filtering is used to extract the multipath errors in the dynamic deformation monitoring of GPS based on the repetitive characteristics of GPS satellite orbit. Designing a simulation experiment to demonstrates the effectiveness of the adaptive filtering in extracting the multipath error. Finally,the adaptive filter is used in the dynamic deformation monitoring experiment to extract the GPS multipath error effectively,and the dairy repetition model of multipath error was established.
引文
[1] 刘超,王坚,胡洪等. 动态变形监测多路径实时修正模型研究[J]. 武汉大学学报·信息科学版,2010,35(4):481～485.
[2] Ray J K. Mitigation of GPS code and carrier phase multipath effects using a multi-antenna system[D]. Calgary:University of Calgary,2000.
[3] 徐绍铨,张华海,杨志强等. GPS测量原理及应用[M]. 武汉:武汉大学出版社,2008.
[4] 殷海涛,甘卫军,肖根如. 恒星日滤波的修正以及对高频GPS定位的影响研究[J]. 武汉大学学报· 信息科学版,2011,36(5):609～611.
[5] Eweda E. Comparison of rls,lms,and sign algorithms for tracking randomly time-varying channels[J]. Signal Processing,Ieee Transactions On,1994,42(11):2937～2944.
[6] 匡翠林,戴吾蛟. GPS监测高层建筑风致振动变形及小波应用[J]. 武汉大学学报· 信息科学版,2010,35(9):1024～1028.
[7] 范晓燕,周乾. GPS测量中多路径效应研究综述[J]. 工程地球物理学报,2010,7(3):382～386.
[8] 殷海涛,甘卫军,熊永良等. PCA空间滤波在高频GPS定位中的应用研究[J]. 武汉大学学报·信息科学版,2011,36(7):825～829.
[2] Ray J K. Mitigation of GPS code and carrier phase multipath effects using a multi-antenna system[D]. Calgary:University of Calgary,2000.
[3] 徐绍铨,张华海,杨志强等. GPS测量原理及应用[M]. 武汉:武汉大学出版社,2008.
[4] 殷海涛,甘卫军,肖根如. 恒星日滤波的修正以及对高频GPS定位的影响研究[J]. 武汉大学学报· 信息科学版,2011,36(5):609～611.
[5] Eweda E. Comparison of rls,lms,and sign algorithms for tracking randomly time-varying channels[J]. Signal Processing,Ieee Transactions On,1994,42(11):2937～2944.
[6] 匡翠林,戴吾蛟. GPS监测高层建筑风致振动变形及小波应用[J]. 武汉大学学报· 信息科学版,2010,35(9):1024～1028.
[7] 范晓燕,周乾. GPS测量中多路径效应研究综述[J]. 工程地球物理学报,2010,7(3):382～386.
[8] 殷海涛,甘卫军,熊永良等. PCA空间滤波在高频GPS定位中的应用研究[J]. 武汉大学学报·信息科学版,2011,36(7):825～829.