Benefits of the third frequency signal on cycle slip correction

Zhang, Xiaohong; Li, Pan

doi:10.1007/s10291-015-0456-2

Cited by 69 publications

(37 citation statements)

References 29 publications

(30 reference statements)

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“…With the rapid development of the new generations of GNSS, GNSS users would be allowed to make use of observations operated on three or more frequencies. The extra frequencies are expected to benefit precise GNSS data processing, such as carrier phase multipath extraction, cycle slip processing (deLacy et al 2012;Simsky 2006;Zhang and Li 2016), and especially AR. Large number of publications has contributed to the three carrier phase ambiguity resolution (TCAR) for precise relative positioning (e.g., Forssell et al 1997;Li et al 2010;Zhang and He 2016).…”

Section: Introductionmentioning

confidence: 99%

Three-frequency BDS precise point positioning ambiguity resolution based on raw observables

Pan

Zhang

et al. 2018

J Geod

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All Beidou navigation satellite system (BDS) satellites are transmitting signals on three frequencies, which brings new opportunity and challenges for high-accuracy precise point positioning (PPP) with ambiguity resolution (AR). This paper proposes an effective uncalibrated phase delay (UPD) estimation and AR strategy which is based on a raw PPP model. First, triple-frequency raw PPP models are developed. The observation model and stochastic model are designed and extended to accommodate the third frequency. Then, the UPD is parameterized in raw frequency form while estimated with the high-precision and low-noise integer linear combination of float ambiguity which are derived by ambiguity de-correlation. Third, with UPD corrected, the LAMBDA method is used for resolving full or partial ambiguities which can be fixed. This method can be easily and flexibly extended for dual-, triple-, or even more frequency. To verify the effectiveness and performance of triple-frequency PPP AR, tests with real BDS data from 90 stations lasting for 21 days were performed in static mode. Data were processed with three strategies: BDS triple-frequency ambiguity-float PPP, BDS triple-frequency PPP with dual-frequency (B1/B2) and three-frequency AR, respectively. Numerous experimental results showed that compared with the ambiguity-float solution, the performance in terms of convergence time and positioning biases can be significantly improved by AR. Among three groups of solutions, the triple-frequency PPP AR achieved the best performance. Compared with dual-frequency AR, additional the third frequency could apparently improve the position estimations during the initialization phase and under constraint environments when the dual-frequency PPP AR is limited by few satellite numbers.

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Section: Introductionmentioning

confidence: 99%

Three-frequency BDS precise point positioning ambiguity resolution based on raw observables

Pan

Zhang

et al. 2018

J Geod

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“…These characteristics greatly increase the difficulty of dual-frequency cycle slip detection. While triple frequencies are transmitted by all BDS satellites and some triple-frequency-based methods have been proposed, such as Wu et al (2010), de Lacy et al (2012, Huang et al (2016) and Zhang and Li (2016), many GNSS receivers do not track triple frequencies at the present time (Chen et al 2016). In addition, most of the current PPP and POD algorithms are still based on dual-frequency observations.…”

Section: Introductionmentioning

confidence: 99%

Enhanced cycle slip detection method for dual-frequency BeiDou GEO carrier phase observations

Chang

et al. 2017

GPS Solut

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Cycle slip detection is one of the essential steps for high-precision GNSS data processing when carrier phase observations are involved, such as in precise point positioning (PPP) and precise orbit determination (POD). A number of algorithms have been developed since the 1980s and are effective for processing dual-frequency GPS. However, the emerging BeiDou navigation satellite system in China brings some new challenges for these existing algorithms, especially when small cycle slips occur more frequently. In this study, a large number of 1-cycle slips have been found in low-elevation BeiDou GEO carrier phase observations, which are collected by receivers of the IGS multi-GNSS experiment. Such small cycle slips should be identified and repaired, if possible, before PPP and POD processing. We propose an enhanced cycle slip detection method based on the series of dual-frequency phase geometry-free combinations. A robust polynomial fit algorithm and a general autoregressive conditional heteroskedastic modeling technique is employed to provide an adaptive detection threshold, which allows identification of such small cycle slips with high reliability. Simulated and real data tests reveal that the proposed method has both high sensitivity and low false-alarm rate even in the case of ionospheric scintillation.

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“…With the third or more frequencies, new approaches to estimate phase multipath from a singlestation become available (Simsky 2006). Due to the presence of new frequencies, the traditional approaches dealing with cycle slip problems are expanded to multi-frequency cases (e.g., Dai et al 2009;Lacy et al 2012;Zhao et al 2015;Zhang and Li 2015). As for carrier phase ambiguity resolution (AR), significant research effort has been invested towards GPS and Galileo AR in relative positioning using three or more frequencies, including the earliest studies by Forssell et al (1997) and Vollath et al (1998), which described the three carrier phase ambiguity resolution (TCAR) approach.…”

Section: Introductionmentioning

confidence: 99%

Modeling and assessment of triple-frequency BDS precise point positioning

Guo

Zhang

Wang

et al. 2016

J Geod

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112

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The latest generation of GNSS satellites such as GPS BLOCK-IIF, Galileo and BDS are transmitting signals on three or more frequencies, thus having more choices in practice. At the same time, new challenges arise for integrating the new signals. This paper contributes to the modeling and assessment of triple-frequency PPP with BDS data. First, three triple-frequency PPP models are developed. The observation model and stochastic model are designed and extended to accommodate the third frequency. In particular, new biases such as differential code biases and inter-frequency biases as well as the parameterizations are addressed. Then, the relationships between different PPP models are discussed. To verify the triple-frequency PPP models, PPP tests with real triple-frequency data were performed in both static and kinematic scenarios. Results show that the three triple-frequency PPP models agree well with each other. Additional frequency has a marginal effect on the positioning accuracy in static PPP tests. However, the benefits of third frequency are significant in situations of where there is poor tracking and contaminated observations on frequencies B1 and B2 in kinematic PPP tests. B Xiaohong Zhang

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Benefits of the third frequency signal on cycle slip correction

Cited by 69 publications

References 29 publications

Three-frequency BDS precise point positioning ambiguity resolution based on raw observables

Three-frequency BDS precise point positioning ambiguity resolution based on raw observables

Enhanced cycle slip detection method for dual-frequency BeiDou GEO carrier phase observations

Modeling and assessment of triple-frequency BDS precise point positioning

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