Abstract

Satellite chip shape distortions lead to signal tracking errors in pseudorange measurements, which are related to the receiver manufacturers, called receiver-related pseudorange biases. Such biases will lead to adverse effects for differential code bias (DCB) and satellite clock estimation, single point positioning (SPP) and precise point positioning (PPP) applications with pseudoranges. In order to assess the characteristics of receiver-related pseudorange biases for global positioning system (GPS), Galileo navigation satellite system (Galileo) and BeiDou navigation satellite system (BDS), seven short baselines from the Multi-GNSS experiment (MGEX) network are tested. The results demonstrate that there are significant inconsistences of pseudorange biases according to satellites, frequencies, receiver and antenna types. For the baselines using the same receivers of TRIMBLE, pseudorange biases are within ±0.2 ns with the same antennas, while they increase to ±0.6 ns with the different antennas. As for baselines with mixed receiver types, pseudorange biases can reach up to 2.5 ns. Among GPS/Galileo/BDS, Galileo shows the smallest pseudorange biases, and the obvious inconsistences of pseudorange biases are observed between BDS-2 and BDS-3, and Galileo in-orbit validation (IOV) satellites and full operational configuration (FOC) satellites. In order to validate receiver-related pseudorange biases, we carry out relative positioning experiments using short baselines. The results show that the RMS values of position errors are reduced 12.6% and 11.4% in horizontal and vertical components with biases correction. The impacts of receiver-related pseudorange biases on wide-lane (WL) ambiguity are also discussed. The results indicate that the percentage of the fractional parts within ±0.1 cycles have an obvious increase with the pseudorange biases correction, and RMS values of the fractional parts are reduced 28.9% and 67.6% for GPS and BDS, respectively.

Highlights

  • With the development of global navigation satellite systems (GNSS), navigation and positioning applications are evolving from single system to multifrequency and multisystem [1]

  • The results prove that the largest inconsistence of pseudorange biases between satellites are found in global navigation satellite system (GLONASS) frequency-division multiple access (FDMA) signals, followed by Global positioning system (GPS)

  • One group is the baselines equipped with the same receiver types (ZIM2_ZIM3, ZIM2_ZIMM, USN7_USN8 and GODS_GODN), and the other group is the baselines equipped with mixed receiver types (KOKB_KOKV, MAR6_MAR7 and KIR0_KIR8)

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Summary

Introduction

With the development of global navigation satellite systems (GNSS), navigation and positioning applications are evolving from single system to multifrequency and multisystem [1]. Multi-GNSS provides a larger number of satellites, which can reduce position dilution of precision (PDOP). Values, and improve real-time precise point positioning (PPP) accuracy, reliability and availability [6]. It provides triple-frequency signals, improving the performance of ambiguity resolution especially for medium and long baselines [7,8]. In addition to navigation and positioning applications, multifrequency signals benefit to ray tracing the neutral atmosphere and the ionosphere [9]. Different types of satellite orbits offer more ways for earth rotation monitoring and global reference framework establishment [10]

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