Research on impact of attitude quaternions products on BDS PPP
To address the issue of inconsistent attitude models between users and providers during periods of low solar elevation angle and satellite attitude anomalies, the international GNSS service (IGS)has introduced satellite attitude quaternions products.This paper provides a detailed introduction to the attitude control mode of BeiDou satellite navigation system (BDS) satellites and the usage of satellite attitude quaternions.It compares the differences in BDS satellite attitude quaternions products among different analysis centers and investigates the impact of applying attitude quaternions products on precise point positioning (PPP) under different yaw control modes for BDS satellites by using the example of the products provided by the Wuhan University Multi-GNSS Data Analysis Center (WUM).The research findings indicate that, for satellites in standard yaw-steering and orbit-normal periods, the differences among BDS attitude quaternion products from different analysis centers are negligible, with yaw angle variances of less than 0.01°, while during continuous yaw-steering periods, the differences are within 10°.During orbit-normal periods, nominal attitudes significantly deviate from attitude products (180°difference) and persist for one to two weeks.The application of attitude products in such scenarios leads to an improvement in PPP positioning accuracy by 20％ to 60％.Furthermore, during continuous yaw-steering periods, particularly in extreme low solar elevation situations lasting approximately one day, nominal attitudes of multiple satellites in the same orbital plane gradually exhibit reverse yaw.The application of attitude quaternion products during these circumstances results in a 30％ increase in PPP positioning accuracy.In summary, the use of satellite attitude quaternions for PPP during low solar elevation periods yields significantly improved positioning accuracy compared to nominal attitudes, approaching the normal accuracy levels.
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维普
