GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application
- 1.2k Downloads
Knowledge of inter-system biases (ISBs) is essential to combine observations of multiple global and regional navigation satellite systems (GNSS/RNSS) in an optimal way. Earlier studies based on GPS, Galileo, BDS and QZSS have demonstrated that the performance of multi-GNSS real-time kinematic positioning is improved when the differential ISBs (DISBs) corresponding to signals of different constellations but transmitted at identical frequencies can be calibrated, such that only one common pivot satellite is sufficient for inter-system ambiguity resolution at that particular frequency. Recently, many new GNSS satellites have been launched. At the beginning of 2016, there were 12 Galileo IOV/FOC satellites and 12 GPS Block IIF satellites in orbit, while the Indian Regional Navigation Satellite System (IRNSS) had five satellites launched of which four are operational. More launches are scheduled for the coming years. As a continuation of the earlier studies, we analyze the magnitude and stability of the DISBs corresponding to these new satellites. For IRNSS this article presents for the first time DISBs with respect to the L5/E5a signals of GPS, Galileo and QZSS for a mixed-receiver baseline. It is furthermore demonstrated that single-frequency (L5/E5a) ambiguity resolution is tremendously improved when the multi-GNSS observations are all differenced with respect to a common pivot satellite, compared to classical differencing for which a pivot satellite is selected for each constellation.
KeywordsGPS Galileo QZSS IRNSS Multi-GNSS Differential inter-system bias (DISB) RTK
Part of this work has been carried out in the context of the Positioning Program Project 1.19 “Multi-GNSS PPP-RTK Network Processing” of the Cooperative Research Centre for Spatial Information (CRC-SI) in Australia. P.J.G. Teunissen is the recipient of an Australian Research Council (ARC) Federation Fellowship (Project No. FF0883188). This support is gratefully acknowledged.
- Cameron A, Reynolds T (2014) Power loss created trouble aboard Galileo satellite. http://www.gpsworld.com/trouble-aboard-galileo-satellite/
- Hegarty C, Powers E, Fonville B (2004) Accounting for timing biases between GPS, modernized GPS, and Galileo signals. In: Proceedings of 36th annual Precise Time and Time Interval (PTTI) meeting, Washington, DC, 7–9 Dec, pp. 307–317Google Scholar
- Hellemans A (2014) A simple plumbing problem sent Galileo satellites into wrong orbits. http://spectrum.ieee.org/tech-talk/aerospace/satellites/a-simple-plumbing-problem-sent-galileo-satellites-into-wrong-orbits
- IGS and RTCM-SC104 (2015) RINEX—The receiver independent exchange format, Version 3.03, 14 July. International GNSS Service (IGS), RINEX Working Group and Radio Technical Commission for Maritime Services Special CommitteeGoogle Scholar
- Javad (2016) Personal communication with the helpdesk of Javad GNSS Inc. Feb 2016Google Scholar
- Julien O, Alves P, Cannon ME, Zhang W (2003) A tightly coupled GPS/GALILEO combination for improved ambiguity resolution. In: Proceedings of ENC-GNSS 2003, Graz, Austria, 22–25 AprilGoogle Scholar
- Melgard T, Tegedor J, Jong K de, Lapucha D, Lachapelle G (2013) Interchangeable integration of GPS and Galileo by using a common system clock in PPP. In: Proceedings of ION GNSS + 2013, Nashville, TN, 16–20 Sept, pp. 1198–1206Google Scholar
- Odijk D, Teunissen PJG (2013b) Estimation of differential inter-system biases between the overlapping frequencies of GPS, Galileo, BeiDou and QZSS. In: Proceedings of 4th international colloquium scientific and fundamental aspects of the Galileo programme, Prague, Czech Republic, 4–6 Dec, p 8Google Scholar
- Odolinski R, Teunissen PJG, Odijk D (2014) Combined GPS + BDS + Galileo + QZSS for long baseline RTK positioning. In: Proceedings of ION GNSS + 2014, Tampa, FL, 8–12 Sept, pp 2326–2340Google Scholar
- Teunissen PJG, Khodabandeh A, Zhang B (2016) Multi-GNSS PPP-RTK: mixed-receiver network and user scenarios. In: International association of geodesy (IAG) symposia series, 26th IUGG General Assembly 2015, Prague, Czech Republic, 22 June–2 July (under review) Google Scholar
- Yuan Y, Zhang B (2014) Retrieval of inter-system biases (ISBs) using a network of multi-GNSS receivers. J Glob Position Syst 13(1):22–29Google Scholar