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.
维普
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