›› 2015, Vol. 35 ›› Issue (5): 8-14.doi: 10.3780/j.issn.1000-758X.2015.05.002

• 研究探讨 • 上一篇    下一篇

地基伪卫星系统多址测距误差的校正算法

何成龙, 蔚保国   

  1. (中国电子科技集团公司第五十四研究所,石家庄050081)
  • 收稿日期:2015-04-28 修回日期:2015-06-30 出版日期:2015-10-25 发布日期:2015-10-25
  • 作者简介:何成龙 1987年生,2013年获中国电子科技集团公司第五十四研究所信号与信息处理专业硕士学位,现为中国电子科学技术研究院通信工程专业博士研究生。研究方向为卫星导航与导航战
  • 基金资助:

    国家高技术研究发展计划(2012AA121801)资助项目

Ranging Error Caused by MAI in Terrestrial Pseudolites System and its Correction Method

HE  Cheng-Long, YU  Bao-Guo   

  1. (The54thResearchInstituteofChinaElectronicsTechnologyGroupCorporation,Shijiazhuang050081)
  • Received:2015-04-28 Revised:2015-06-30 Online:2015-10-25 Published:2015-10-25

摘要: 相对于卫星导航,地基伪卫星与接收机距离较近,测距中不涉及电离层传播等误差,易实现高精度测距和定位。但由于地基伪卫星位置固定,在信号连续发射模式下伪卫星信号间的多址干扰(MAI)会引起相对恒定的测距误差,针对地基伪卫星系统这一特点,提出一种基于反馈串行干扰抵消(SIC)的测距算法。首先对全部伪卫星信号进行捕获跟踪和功率估计,然后通过串行干扰抵消算法降低强功率伪卫星信号对期望测距信号的干扰,通过反馈模式进一步提高干扰抵消算法的性能。仿真结果表明,该方法可有效改善地基伪卫星系统强远近效应区域内的测距性能,不考虑其他误差下在强远近效应区域内基于码环可将伪卫星测距性能从10 m以上降低到约0.3 m。

关键词: 多址干扰, 测距精度, 反馈校正, 串行干扰抵消, 地基伪卫星, 导航

Abstract: The terrestrial pseudolites system is easy to realize high accuracy positioning comparing with the low transmit error in lineofsight propagation link, while it has approximate constant ranging error under its multiaccess interferenc(MAI) for all terrestrial pseudolites having constant positions. A correction method based on feedbackSIC (Serial Interference Cancellation)was given. First the receiver decide whether it is in strong nearfar effect area based on ranging and coarse positioning data; then restrain the interference of strong pseudolites′ signals on needed signals′ ranging by SIC; a feedback structure was adopted to enhance the cancellation performance. The simulation and hardware test results show that the method has an effective ranging correction performance which could reduce the error from tens of meters to 0.3 m in certain environment with high near-far effect.

Key words: Multi-accessinterference, Rangingaccuracy, Feedbackcorrelation, Serialinterferencecancellation, Terrestrialpseudolites, Navigation