| 北斗卫星伪距码偏差特性及其影响分析 |
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| 引用本文： | 楼益栋,龚晓鹏,辜声峰,郑福,易文婷.北斗卫星伪距码偏差特性及其影响分析[J].武汉大学学报(信息科学版),2017,42(8):1040-1046. |
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| 作者姓名： | 楼益栋 龚晓鹏 辜声峰 郑福 易文婷 |
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| 作者单位： | 1.武汉大学卫星导航定位技术研究中心, 湖北 武汉, 430079 |
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| 基金项目： | 国家重点研发计划2016YFB0501802国家自然科学基金41374034国家自然科学基金41504028国家863计划2014AA123101 |
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| 摘 要： | 在北斗导航卫星伪距码偏差特性分析的基础上，建立了倾斜地球同步轨道卫星（IGSO）和中轨卫星（MEO）的伪距码偏差多项式改正模型；并利用星间单差宽巷小数周一致性，分析建立北斗地球同步轨道卫星（GEO）卫星伪距码偏差改正模型。采用武汉大学北斗试验网、中国陆态网络和MGEX网不同位置、不同类型接收机观测数据进行分析验证，结果表明，北斗卫星伪距码偏差特性与观测值频率、卫星类型相关，所有GEO和IGSO卫星变化规律相同，所有MEO卫星变化规律相同，与接收机类型、测站位置和观测时间无关，偏差值大小随卫星高度角变化，其变化规律稳定，可以采用建立的两类改正模型（GEO/IGSO和MEO）进行修正。通过偏差修正后的伪距无电离层组合的残差、双频SPP以及单频PPP三个方面验证了伪距码偏差改正模型的正确性。
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| 关 键 词： | 北斗 伪距码偏差 GEO 多项式改正 单频精密单点定位 |
| 收稿时间： | 2015-07-04 |
The Characteristic and Effect of Code Bias Variations of BeiDou |
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| Affiliation: | 1.GNSS Research Center, Wuhan University, Wuhan 430079, China |
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| Abstract: | Different from other navigation system, there is a divergence between code and phase observables of BeiDou Navigation Satellite System (BDS). In this paper, we analyze the characteristic of code bias variations and propose a polynomial correction model of GEO, IGSO and MEO satellites. Firstly, different stations and different receiver types observables of BeiDou Experiment Tracking Stations (BETS) of Wuhan University, Crustal Movement Observation Network of China (CMONOC) and Multi-GNSS Experiment campaign(MGEX) of IGS are used for analysis and verification. The results show that the code bias variations, which are dependent with satellite types and frequency and independent with receiver type, station position and observation time, vary with satellite elevations. Besides, the code bias variations of satellites may reach up to 1.5 m and can be divided into two groups (GEO/IGSO and MEO). Secondly, based on the analysis of code bias variations of BDS, we established a polynomial correction model of IGSO/MEO code bias variations. Besides, since the elevation of a GEO satellite remains unchanged, we propose to model the single-difference fractional cycle bias with wide-spread ground stations. Then, a correction model for code bias variations of GEO satellites is established by using the consistency of the fractional of wide-lane ambiguity of single-difference between satellites. Finally, the improvement brought by applying our correction model is validated by various strategies, e.g. residual distribution of pseudo-range is more close to normal distribution, and the positioning accuracy of dual-frequency single point positioning as well as single-frequency precise point positioning is improved. |
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