Triple-frequency carrier ambiguity resolution for Beidou navigation satellite system
Triple-frequency carrier ambiguity resolution for Beidou navigation satellite system
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DOI：
10.1007/s10291-013-0333-9
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发表时间：
2014-07-01
期刊：
影响因子：
4.9
通讯作者：
Liu, Jingnan
中科院分区：
文献类型：
--
作者：
Tang, Weiming;Deng, Chenlong;Liu, Jingnan
中国的北斗系统，也被称为指南针，已经进入试运行阶段，已经可以为三频用户提供服务。使用三频信号对模糊度的解算有很大的好处。在分析北斗频率误差特性的基础上，介绍了三频信号最佳组合的选择过程。给出了三频信号的几何模型和无几何模型。介绍了三种三频载波模糊度解算方法，包括级联四舍五入法、逐步AR法和改进的逐步AR法。为了评估这些方法的性能，使用北斗三频接收机收集了不同长度的基线观测数据，并使用三种方法逐个历元进行处理。同样的观测数据也以双频模式进行处理以进行比较。结果表明，与基于双频的解相比，改进的分步AR方法在短基线(<；20公里)和中长基线(20-50公里)的三倍频率单历元模糊度解算成功率分别提高了近30%和100%。
The Chinese Beidou system, also known as Compass, has entered its trial operational stage and can already provide services for triple-frequency users. Using triple-frequency signals is expected to be of great benefit for ambiguity resolution. Based on error characteristic analysis of the Beidou frequencies, we introduce the procedure of selecting the best combinations of triple-frequency signals. The geometry-based model and geometry-free model of triple-frequency signals are presented. Three triple-frequency carrier ambiguity resolution (TCAR) methods are described, which include the cascading rounding method, the stepwise AR method and the modified stepwise AR method. In order to evaluate the performance of these methods, observations from baselines of various lengths were collected using Beidou triple-frequency receivers and were processed epoch-by-epoch using the three methods. The same observation data were also processed in a dual-frequency mode for comparison. The results show that, compared to the dual-frequency based solution, the single epoch ambiguity resolution success rate with triple frequency improved nearly 30 % for the short baselines (< 20 km) and 100 % for the mid-length baselines (20-50 km) using the proposed modified stepwise AR method.