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顾及BDS-3星钟约束的GNSS超快速轨道钟差解算方法

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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.
GNSS ultra-rapid orbit and clock offset estimation method with the aid of the constraint of BDS-3 onboard clock
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 deter-mination 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.Third-ly,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 satel-lite 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.

BDS-3 onboard clockGNSS ultra-rapid clock offset and orbitprecise orbit determinationconstraint modelsyn-chronously processed method

胡超、王潜心

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安徽理工大学空间信息与测绘工程学院,安徽淮南 232001

中国矿业大学环境与测绘学院,江苏徐州 221116

BDS-3星钟 GNSS超快速轨道钟差 精密定轨 约束模型 同步处理

国家重点研发计划安徽省自然科学基金安徽省自然科学基金安徽省自然科学基金国家自然科学基金

2020YFA07135022108085QD1732208085MD1012308085QD12741874039

2024

10.11947/j.AGCS.2024.20230168

测绘学报
中国测绘学会

测绘学报

CSTPCD北大核心
影响因子：1.602
ISSN：1001-1595
年,卷(期)：2024.53(3)
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