| 一种北斗非差非组合长距离基准站模糊度解算方法 |
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| 引用本文： | 李博,程鹏飞,秘金钟,徐彦田,祝会忠,高猛,谷守周.一种北斗非差非组合长距离基准站模糊度解算方法[J].武汉大学学报(信息科学版),2023,48(4):593-603. |
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| 作者姓名： | 李博 程鹏飞 秘金钟 徐彦田 祝会忠 高猛 谷守周 |
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| 作者单位： | 1.辽宁工程技术大学测绘与地理科学学院, 辽宁 阜新, 123000 |
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| 基金项目： | 国家自然科学基金41930535中国测绘科学研究院基本科研业务费AR1903国家重点研发计划2016YFB0501405 |
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| 摘 要： | 为了充分利用各频率观测值信息，提出了一种非差非组合的北斗卫星导航系统长距离基准站间整周模糊度解算方法。首先，直接利用不同频率的观测值建立误差观测方程，并采用随机游走策略估计相对天顶对流层湿延迟误差和电离层延迟误差，增加历元间的约束；然后，采用一种非差整周模糊度实时线性计算方法，依次得到基准站网当前历元所有卫星的非差整周模糊度，解决了在基准星变换时，模糊度需要承接或者重新进行法方程叠加的问题；最后，使用实测数据进行方法验证，结果表明，各基准站模糊度平均固定速度为20个历元（采样间隔1 s），可快速实现基准站载波相位整周模糊度解算。由于所提方法充分利用了各频率观测值信息，避免了线性组合放大噪声对整周模糊度固定的影响，其模糊度固定成功率与无电离层组合法相比有较大的提高。
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| 关 键 词： | 北斗 非差非组合 整周模糊度 对流层延迟误差 电离层延迟误差 长距离基准站 |
| 收稿时间： | 2021-10-16 |
A Method for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-Range Reference Stations |
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| Affiliation: | 1.School of Geomatics, Liaoning Technical University, Fuxin 123000, China2.Chinese Academy of Surveying and Mapping, Beijing 100830, China3.Ministry of Natural Resources, Beijing 100812, China |
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| Abstract: | Objectives In order to make full use of the observed value information of each frequency, an undifferenced and uncombined integer ambiguity resolution method between BeiDou satellite navigation system (BDS) long-range reference stations is proposed. Methods First, the error observation equation is established directly by using the observations of different frequencies, and the relative zenith tropospheric wet delay error and ionospheric delay error are estimated by random walk strategy to increase the constraint between epochs. Second, a linear calculation method of undifferenced integer ambiguity real-time is used to obtain the undifferenced integer ambiguity of all satellites in the current epoch of the reference network. It solves the problem that ambiguity needs to be inherited or re-superimposed on normal equations in the reference star transformation. Because the information of each frequency observation is fully utilized, the influence of linear combination amplification noise on integer ambiguity fixing is avoided, and the ambiguity fixing success rate of uncombined method is much higher than that of ionosphere-free combination method. Results and Conclusions The results show that the average fixed speed of ambiguity of each reference station is 20 epochs (sampling interval 1 s). The integer ambiguity resolution of the carrier phase of the reference station can be realized quickly. |
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