Abstract
Abstract To meet the high demand for convergence speed in real-time precise point positioning (RTPPP), this paper comprehensively considers both satellite clock offset services and the PPP user perspective, deriving the inter-system bias (ISB) in detail. Using the precise satellite clock offset products from Wuhan University along with self-computed products, we analyze the datum issues related to satellite clock offsets/ISB, taking into account the effects of daily boundary changes, and propose a reliable ISB product workflow. We examine the statistical characteristics of ISB for different receiver types, highlighting their potential to enhance RTPPP performance as prior constraints. Experimental results indicate that after datum unification, the discontinuity of ISB caused by daily boundary issues can be avoided; the ISB values for the same type of receivers are closely aligned, and the statistical characteristics of ISB remain stable. When utilizing ISB products as prior constraints in the Global Positioning System + BeiDou Navigation Satellite System dual-system RTPPP, the root mean square and convergence time in the East-Up-North direction improve by 18%, 10%, 2%, 8%, 3%, and 1% compared to the original PPP, respectively. For the Global Positioning System + Galileo navigation satellite system, the corresponding improvements are 28%, 26%, 17%, 39%, 31%, and 17%.
Published Version
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