Abstract:As the service capabilities of the GPS system has improved steadily, and with the increasing demand for real-time positioning service, real-time satellite clock products are gaining more attention by experts and scholars in relevant fields. In this paper, we implement real-time GPS satellite clock offset estimation based on a modified mixed-differenced algorithm. The realization of this method consists of four steps, which can generate final real-time satellite clock offset products for users. The real-time clock product of GPS satellites is solved using real-time stream data from 68 globally distributed stations. For the generated real-time GPS satellite clock products from Jan 14 to Jan 19, 2018, two ways are used to evaluate the products: first, comparing with the IGS rapid clock offset products; and second, applying the products in real-time kinematic PPP. We verify that the real-time clock product based on the modified mixed-differenced algorithm can reach accuracy of about STD 0.15 ns, RMS 0.63 ns. It can provide real-time centimeter-level positioning service.
CHEN Yongchang,YUAN Yunbin,AI Qingsong et al. A Modified Mixed-Differenced Method for Real-Time GPS Satellite Clock Offset Estimation and Its Realization[J]. jgg, 2019, 39(4): 399-403.