Abstract
Global Navigation Satellite System pseudorange biases are of great importance for precise positioning, timing and ionospheric modeling. The existence of BeiDou Navigation Satellite System (BDS) receiver-related pseudorange biases will lead to the loss of precision in the BDS satellite clock, differential code bias estimation, and other precise applications, especially when inhomogeneous receivers are used. In order to improve the performance of BDS precise applications, two ionosphere-free and geometry-free combinations and ionosphere-free pseudorange residuals are proposed to calibrate the raw receiver-related pseudorange biases of BDS on each frequency. Then, the BDS triple-frequency receiver-related pseudorange biases of seven different manufacturers and twelve receiver models are calibrated. Finally, the effects of receiver-related pseudorange bias are analyzed by BDS single-frequency single point positioning (SPP), single- and dual-frequency precise point positioning (PPP), wide-lane uncalibrated phase delay (UPD) estimation, and ambiguity resolution, respectively. The results show that the BDS SPP performance can be significantly improved by correcting the receiver-related pseudorange biases and the accuracy improvement is about 20% on average. Moreover, the accuracy of single- and dual-frequency PPP is improved mainly due to a faster convergence when the receiver-related pseudorange biases are corrected. On the other hand, the consistency of wide-lane UPD among different stations is improved significantly and the standard deviation of wide-lane UPD residuals is decreased from 0.195 to 0.061 cycles. The average success rate of wide-lane ambiguity resolution is improved about 42.10%.
Highlights
With the development of the Global Navigation Satellite System (GNSS), multi-frequency and multi-GNSS are the main characteristics of future satellite navigation
With the measurements from geodetic receivers, reference [19] studied the dependency of pseudorange biases on correlator design and pointed that the signal distortions differ from satellite to satellite, the receiver’s filter response differs for each satellite and causes satellite-dependent biases, which will affect the positioning and timing accuracy
It is demonstrated that the initial bias of satellite clock estimation and positioning accuracy of dual-frequency single point positioning (SPP) are significantly improved when the BeiDou Navigation Satellite System (BDS) pseudorange biases are corrected
Summary
With the development of the Global Navigation Satellite System (GNSS), multi-frequency and multi-GNSS are the main characteristics of future satellite navigation. With the measurements from geodetic receivers, reference [19] studied the dependency of pseudorange biases on correlator design and pointed that the signal distortions differ from satellite to satellite, the receiver’s filter response differs for each satellite and causes satellite-dependent biases, which will affect the positioning and timing accuracy. It is demonstrated that the initial bias of satellite clock estimation and positioning accuracy of dual-frequency single point positioning (SPP) are significantly improved when the BDS pseudorange biases are corrected This correction model is only suitable for data processing of B1/B2 IF combination and is not applicable in BDS single-frequency or triple-frequency data processing. In order to further improve the performance of BDS precise data processing, it is essential to deeply study the characteristics of BDS signal delay biases In this contribution, BDS receiver-related pseudorange biases of triple-frequency observations will be calibrated and validated.
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