BDS Satellites and Receivers DCB Resolution
Using GNSS observation data to establish high-precision ionospheric model has an important role in precise point positioning, real-time navigation and ionosphere research. One of the main error sources to accurately estimate total electron content (TEC) i
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BDS Satellites and Receivers DCB Resolution Qiang Zhang, Qile Zhao, Hongping Zhang and Guo Chen
Abstract Using GNSS observation data to establish high-precision ionospheric model has an important role in precise point positioning, real-time navigation and ionosphere research. One of the main error sources to accurately estimate total electron content (TEC) is Differential Code Bias (DCB). At present, the international GNSS Service (IGS) daily publish GPS and GLONASS satellites DCB and IGS tracking station receivers DCB, BeiDou Navigation Satellite System (BDS) has not provided the BDS satellites DCB services. Based on BeiDou Experimental Tracking Stations (BETS), and use a combination of ionospheric residual method to resolve BDS satellites DCB and BETS tracking station receivers DCB at B1 and B2 frequencies. The results show that, BDS satellites DCB are between -8 and 16 ns at B1 and B2 frequencies and their stabilities are basically better than 0.5 ns. Because of the satellite elevation, IGSO satellites DCB have highest stabilities, followed by MEO satellites, and GEO satellites have worst stabilities, especially C04 and C05; BETS tracking station receivers DCB are basically between -5 and -25 ns, and their stabilities are better than 1.5 ns. Keywords BDS
Ionosphere DCB TEC
17.1 Introduction GNSS signal is transmitted from the satellite internal part to the transmitting antenna and from receiver antenna to digital IF output and the time delay is known as the hardware delay. Difference between different frequency signal (carrier phase or pseudorange code) time delay is called the hardware delay bias. Delay bias between the pseudorange code is called Differential Code Bias (DCB), and Q. Zhang (&) Q. Zhao H. Zhang G. Chen GNSS Research Center, Wuhan University, Wuhan, Hubei Province, China e-mail: [email protected]
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, Lecture Notes in Electrical Engineering 305, DOI: 10.1007/978-3-642-54740-9_17, Springer-Verlag Berlin Heidelberg 2014
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between the carrier phase is called Uncalibrated Phase Delays (UPD) [1]. DCB product released by IGS Ionosphere Working-group show that, the magnitudes for the GPS satellites DCB at P1 and P2 frequencies are -10 to 10 ns. It will result in 30 TECU errors, without considering the satellites DCB (for GPS L4 combination frequency, 1 ns is about 2.86 TECU) [2]. Ionosphere Association Analysis Centers JPL, CODE, ESOC use different methods to estimate global ionospheric model, while satellites and receivers DCB as the by-product are estimated at the same time [3–6], but UPC uses a combination of ionospheric residual method to separate satellites DCB [7]. IGS daily release combined satellites DCB computed by the four IAACs using a weighted-mean method [8], its stabilities are better than 0.1 ns. Some domestic academics have done some research on the GPS DCB, and their study results are basically in line with each other [9, 10]. BeiDou Navigation Sate
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