Performance analysis of triple-frequency ambiguity resolution with BeiDou observations

Zhang, Xiaohong; He, Xingui

doi:10.1007/s10291-014-0434-0

Cited by 56 publications

(23 citation statements)

References 8 publications

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“…LAMBDA, geometry-free models for three-carrier ambiguity resolution (TCAR) (Forssell et al 1997;Vollath et al 1998), geometry-based TCAR (Teunissen et al 2002;Li 2008, 2009), and GIF-TCAR (TCAR based on a geometry-free and ionosphere-free combination) (Wang and Rothacher 2013), Zhang and He (2015) highlighted that the LAMBDA method is optimal in both short-and medium-baseline (10-100 km) cases. Li et al (2015) developed a reliable AR strategy that efficiently resolves ambiguities sequentially under the integer least square (ILS) condition (Teunissen 1995) for the case of short-range RTK.…”

Section: Introductionmentioning

confidence: 99%

A sequential and partial ambiguity resolution strategy for improving the initialization performance of medium-baseline relative positioning

Zhang

Zhao

et al. 2016

Earth Planet Sp

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Ionosphere products that are relatively precise are available thanks to the efforts of the International GNSS Service (IGS), and it might be possible to obtain a high success rate for the fixed integer ambiguities for medium-or longerbaseline ambiguity resolution (AR) using the ionosphere products as a priori information constraints. In this study, we used the IGS precise ionosphere products as a priori information before forming double-difference (DD) measurement equations using only original observables in a mid-range relative positioning and estimated the ionosphere residuals explicitly after DD. Furthermore, we proposed a sequential and partial ambiguity resolution (SPAR) strategy under the integer least square condition to realize fast and reliable AR. To demonstrate our proposed strategy, we randomly selected seven baselines ranging from 30 to 111 km and undertook positioning in a post-processing mode using real GPS dual-frequency data. According to the results, the SPAR strategy has a faster convergence process compared with batch AR. For instance, the convergence time with >90 % cumulative frequency percentage (probability) for 30, 40, 56, 66, 80, 95, and 111 km baselines was advanced by 55, 50, >75, 85, >110, 65, and >35 epochs, respectively, with a 30-s sample interval. By considering ionospheric correction before DD, we found further improvement in the initialization performance with the use of the SPAR strategy.

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Section: Introductionmentioning

confidence: 99%

A sequential and partial ambiguity resolution strategy for improving the initialization performance of medium-baseline relative positioning

Zhang

Zhao

et al. 2016

Earth Planet Sp

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“…The recent progress in the field of multi-GNSS precise positioning, including BDS-based precise positioning, inter-system biases, etc., should also be considered [38][39][40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Precise Orbit Determination of BeiDou Satellites with Contributions from Chinese National Continuous Operating Reference Stations

et al. 2017

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The precise orbit determination (POD) for BeiDou satellites is usually limited by the insufficient quantity and poor distribution of ground tracking stations. To cope with this problem, this study used the GPS and BeiDou joint POD method based on Chinese national continuous operating reference stations (CNCORS) and IGS/MGEX stations. The results show that the 3D RMS of the differences of overlapping arcs is better than 22 cm for geostationary orbit (GEO) satellites and better than 10 cm for inclined geosynchronous orbit (IGSO) and medium earth orbit (MEO) satellites. The radial RMS is better than 2 cm for all three types of BeiDou satellites. The results of satellite laser ranging (SLR) residuals show that the RMS of the IGSO and MEO satellites is better than 5 cm, whereas the GEO satellite has a systematic bias. This study investigates the contributions of CNCORS to the POD of BeiDou satellites. The results show that after the incorporation of CNCORS, the precision of overlapping arcs of the GEO, IGSO, and MEO satellites is improved by 15.5%, 57.5%, and 5.3%, respectively. In accordance with the improvement in the precision of overlapping arcs, the accuracy of the IGSO and MEO satellites assessed by the SLR is improved by 30.1% and 4.8%, respectively. The computation results and analysis demonstrate that the inclusion of CNCORS yields the biggest contribution in the improvement of orbit accuracy for IGSO satellites, when compared to GEO satellites, while the orbit improvement for MEO satellites is the lowest due to their global coverage.

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“…The observation vector L is composed of the IF phase combinations, the HMW combinations, and the IF code combinations. The observation vector can be expressed as: (16) and,…”

Section: Generalized Phase-code Methodsmentioning

confidence: 99%

BeiDou System (BDS) Triple-Frequency Ambiguity Resolution without Code Measurements

Chu

Yang

2018

Remote Sensing

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Phase and code measurements achieve ambiguity resolution in medium-or long-baseline computation. However, the code multipath effect on Global Navigation Satellite Systems (GNSS) phase and code measurements is a main source of error for ambiguity resolution, in particular the code multipath. The BeiDou System (BDS) of China is fully operational in the Asia-Pacific region and provides triple-frequency (B1, B2 and B3) measurements. Although previous research about BDS triple-frequency baseline computation indicated that using triple-frequency measurements improves the performance of ambiguity resolution, the respective methods are still impacted by code multipath since the code measurements are incorporated in the methods. Therefore, it is of interest to further improve the ambiguity resolution of BDS triple-frequency baseline computation by excluding the code multipath. We propose a modified phase-only method that only uses triple-frequency phase measurements to achieve BDS ambiguity resolution and evaluate the performance of the method. Observations from experimental medium and long baselines were collected with Trimble NetR9 receivers. The related ambiguity-resolution performances are computed with the phase-only method and a generalized phase-code method. The results show that the phase-only ambiguity resolution is feasible and generally performs better than the phase-code ambiguity resolution, but the improvement is subject to phase noise and satellite geometry.

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Performance analysis of triple-frequency ambiguity resolution with BeiDou observations

Cited by 56 publications

References 8 publications

A sequential and partial ambiguity resolution strategy for improving the initialization performance of medium-baseline relative positioning

A sequential and partial ambiguity resolution strategy for improving the initialization performance of medium-baseline relative positioning

Precise Orbit Determination of BeiDou Satellites with Contributions from Chinese National Continuous Operating Reference Stations

BeiDou System (BDS) Triple-Frequency Ambiguity Resolution without Code Measurements

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