测绘学报 ›› 2024, Vol. 53 ›› Issue (3): 413-424.doi: 10.11947/j.AGCS.2024.20230168

• 大地测量学与导航 • 上一篇    下一篇

顾及BDS-3星钟约束的GNSS超快速轨道钟差解算方法

胡超1, 王潜心2   

  1. 1. 安徽理工大学空间信息与测绘工程学院, 安徽 淮南 232001;
    2. 中国矿业大学环境与测绘学院, 江苏 徐州 221116
  • 收稿日期:2023-06-07 修回日期:2023-11-11 发布日期:2024-04-08
  • 通讯作者: 王潜心 E-mail:wqx@cumt.edu.cn
  • 作者简介:胡超(1990—),男,博士,副教授,研究方向为卫星大地测量数据处理。E-mail:chaohu2014gnss@163.com
  • 基金资助:
    国家重点研发计划(2020YFA0713502);安徽省自然科学基金(2108085QD173;2208085MD101;2308085QD127);国家自然科学基金(41874039)

GNSS ultra-rapid orbit and clock offset estimation method with the aid of the constraint of BDS-3 onboard clock

HU Chao1, WANG Qianxin2   

  1. 1. School of Spatial Informatics and Geomatics Engineering, Anhui University of Science and Technology, Huainan 232001, China;
    2. School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
  • Received:2023-06-07 Revised:2023-11-11 Published:2024-04-08
  • Supported by:
    The National Key Research and Development Program of China (No. 2020YFA0713502); The Anhui Natural Science Foundation (Nos. 2108085QD173; 2208085MD101; 2308085QD127); The National Natural Science Foundation of China (No. 41874039)

摘要: BDS-3高稳定星载原子钟作为北斗星座的显著技术优势,在GNSS数据处理中尚未得到充分利用。针对严格时效性限制下GNSS超快速轨道钟差参数精度受限问题,本文提出顾及BDS-3星钟约束的GNSS超快速轨道钟差解算方法。首先,以GNSS轨道钟差参数间相关性为基础,构建顾及BDS-3星钟参数特性的GNSS定轨模型;然后,基于GNSS精密钟差产品,分析星钟约束对GNSS轨道钟差参数精度的影响规律;最后,为克服预报钟差精度与约束筛选对定轨影响,建立BDS-3星钟建模与GNSS超快速轨道钟差估计的同步处理方法。试验结果表明,在BDS-3星钟参数最优约束下,BDS-3与GPS轨道钟差精度可分别提升27.5%、5.1%和20.2%、5.2%;且较传统BDS-3星钟单历元处理策略,基于BDS-3星钟建模与GNSS超快速定轨同步处理方法,GNSS超快速轨道钟差精度可分别提升至4.8%与34.2%,轨道精度实现了毫米级改善。因此,顾及BDS-3星钟约束的GNSS超快速轨道钟差解算方法可有效对BDS-3高稳星钟信息模型化,并实现GNSS超快速轨道钟差精度的优化处理。

关键词: BDS-3星钟, GNSS超快速轨道钟差, 精密定轨, 约束模型, 同步处理

Abstract: The high-stability BDS-3 onboard clock is one of the significant advanced technologies of BDS, which is underutilized in GNSS data processing. To solve the precision restriction of GNSS ultra-rapid orbit and clock offset parameters under the strict timeliness limitation, GNSS ultra-rapid orbit and clock offset estimation method with the aid of the constraint of BDS-3 onboard clock is proposed in this research. Firstly, based on the correlation GNSS clock offset and orbit, the GNSS orbit determination model is constructed with the consideration of BDS-3 onboard clock parameter. Secondly, impacts of onboard clock constraints on GNSS orbit determination are analyzed by taking BDS-3 precise clock offsets as example in experiments. Thirdly, to overcome the influence of the prediction clock offset and selected constraints on GNSS ultra-rapid orbit determination, the synchronously processed method of BDS-3 clock modelling and GNSS ultra-rapid orbit estimation is proposed. According to the experimental results, it is indicated that the accuracy of BDS-3 and GPS orbit and clock offsets can be respectively improved with 27.5%, 5.1% and 20.2%, 5.2%, under the optimal constraint on BDS-3 onboard clock. Meanwhile, compared with the traditional epoch-wise white noise strategy of GNSS clock parameter, the proposed one-step processing method for BDS-3 satellite clock modeling and GNSS ultra-rapid orbit determination can respectively improve the accuracy of GNSS ultra-rapid clock offset and orbit up to 4.8% and 34.2%, where the millimeter-level orbit accuracy improvements can be obtained. Therefore, the proposed GNSS ultra-rapid orbit and clock offset estimation method based on BDS-3 clock offset constraints can effectively utilize the information of BDS-3 highly stable onboard clock information, and realize the accuracy improvement of GNSS ultra-rapid orbit and clock offsets.

Key words: BDS-3 onboard clock, GNSS ultra-rapid clock offset and orbit, precise orbit determination, constraint model, synchronously processed method

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