Zero-difference GPS ambiguity resolution at CNES–CLS IGS Analysis Center

Loyer, S.; Pérosanz, F.; Mercier, F.; Capdeville, Hugues; Marty, Jean‐Charles

doi:10.1007/s00190-012-0559-2

Cited by 226 publications

(130 citation statements)

References 29 publications

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“…Over the last decade much effort has been spent to overcome these disadvantages. Nowadays, accurate (predicted) satellite orbits are available in real-time together with (near) real-time satellite clock estimates, overcoming the first limitation [26], [27] The use of a single-frequency receiver would significantly reduce the cost of PPP, but requires a different approach to negate the ionosphere delays. One approach, known as GRAPHIC (Group And Phase Ionospheric Correction) [28] is to average the pseudorange and carrier phase measurements for each satellite.…”

Section: Gps Single Frequency Precise Pointmentioning

confidence: 99%

Lane Determination With GPS Precise Point Positioning

Knoop

Bakker

Tiberius

et al. 2017

IEEE Trans. Intell. Transport. Syst.

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Abstract-Modern Intelligent Transport Solutions can achieve improvement of traffic flow on motorways. With lane-specific measurements and lane-specific control more measures are possible. Single Frequency Precise Point Positioning (PPP) is a newly developed and affordable technique to achieve an improved position accuracy compared to Global Positioning System (GPS) standalone positioning. GPS-PPP allows for sub-meter accurate positioning, in real time, of vehicles on a motorway. This paper tests this technique in real life; moreover, it presents a methodology to map the lanes on a motorway using data collected by this technique. The methodology exploits the high accuracy and the fact that most driving is within a lane. In a field test, a GPS-PPP equipped vehicle drives a specific motorway stretch 100 times, for which the GPS-PPP trajectory data are collected. Using these data the positions and the widths of different lanes are successfully estimated. Comparison with the ground truth shows a dm accuracy. With the parametrized lanes, vehicles can be tracked down to a lane with the GPS-PPP device.

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Section: Gps Single Frequency Precise Pointmentioning

confidence: 99%

Lane Determination With GPS Precise Point Positioning

Knoop

Bakker

Tiberius

et al. 2017

IEEE Trans. Intell. Transport. Syst.

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“…An important application of GPS code observations for precise positioning is the fixing of widelane ambiguities based on the Melbourne-Wübbena linear combination (MW; e.g., Geng et al 2010;Loyer et al 2012). Using code measure- …”

Section: Melbourne-wübbena Linear Combinationmentioning

confidence: 99%

“…The extremely large GDV are caused by satellite internal reflections of the L1 and L2 signals at the auxiliary port used for L5 (Lake and Stansell 2009).…”

Section: Introductionmentioning

confidence: 99%

Group delay variations of GPS transmitting and receiving antennas

Wanninger

Sumaya-Martinez

Beer

2017

J Geod

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GPS code pseudorange measurements exhibit group delay variations at the transmitting and the receiving antenna. We calibrated C1 and P2 delay variations with respect to dual-frequency carrier phase observations and obtained nadir-dependent corrections for 32 satellites of the GPS constellation in early 2015 as well as elevationdependent corrections for 13 receiving antenna models. The combined delay variations reach up to 1.0 m (3.3 ns) in the ionosphere-free linear combination for specific pairs of satellite and receiving antennas. Applying these corrections to the code measurements improves code/carrier single-frequency precise point positioning, ambiguity fixing based on the Melbourne-Wübbena linear combination, and determination of ionospheric total electron content. It also affects fractional cycle biases and differential code biases.

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“…CODE solutions include satellites of the following systems: GPS, GLONASS-M, GLONASS-K, Galileo IOV, Galileo FOC, BeiDou-2 MEO, BeiDou-2 IGSO and QZSS. Besides CODE, there are five other ACs which deliver multi-GNSS orbit products in the framework of MGEX: Centre National d'Études Spatiales (CNES/CLS) [4], Helmholtz Centre Potsdam German Research Centre for Geosciences (GFZ) [5], Technische Universität München (TUM), Wuhan University (WU) [40] and Japan Aerospace Exploration Agency (JAXA) [41]. Products from all ACs can be included in the GOVUS service, which is one of the major plans for the future development.…”

Section: System Overview and Description Of Processing Flowmentioning

confidence: 99%

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

2017

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In the last decade, we have been witnessing a rapid development of the constellations of Global and Regional Navigation Satellite Systems (GNSS/RNSS). Besides the well-known GPS and GLONASS, newly developed systems such as Galileo, BeiDou, QZSS and NAVIC have become increasingly important. All satellites of new GNSS are equipped with laser retroreflector arrays (LRA) dedicated to Satellite Laser Ranging (SLR). SLR allows, e.g., an independent validation of microwave-based orbit products. Therefore, a fully operational online service called the multi-GNSS Orbit Validation Visualizer Using SLR (GOVUS) has been developed allowing for near real-time analysis of the quality of multi-GNSS orbits. The mean offsets of SLR residuals for Center for Orbit Determination in Europe (CODE) orbits in 2016 are at the level of −8, −38, −14, and −107 mm, for BeiDou, Galileo, GLONASS, and QZSS, respectively, with the standard deviations of 66, 36, 29, and 100 mm. Moreover, GOVUS can be used as a database containing information on equipment used at SLR stations and multi-GNSS satellite parameters. This paper includes a comprehensive description of the functionality and the structure of the developed service with exemplary analyses. The paper points out the most critical issues, limitations and challenges of multi-GNSS and SLR tracking network in the context of the SLR orbit validation. The goal of the paper and GOVUS itself is to determine: (1) what is the current quality of multi-GNSS orbits validated using SLR results; (2) what kinds of systematic errors can affect GNSS orbits and SLR observations; and (3) how to provide the online analysis tools to the broadest possible multi-GNSS community. The service has been officially operating since March 2017 as the Associate Analysis Center of the International Laser Ranging Service (ILRS ACC).

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Zero-difference GPS ambiguity resolution at CNES–CLS IGS Analysis Center

Cited by 226 publications

References 29 publications

Lane Determination With GPS Precise Point Positioning

Lane Determination With GPS Precise Point Positioning

Group delay variations of GPS transmitting and receiving antennas

A New Online Service for the Validation of Multi-GNSS Orbits Using SLR

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