Real-time cycle slip detection in triple-frequency GNSS

Lacy, M. C.; Reguzzoni, Mirko; Sansò, F.

doi:10.1007/s10291-011-0237-5

Cited by 87 publications

(51 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

112

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling and assessment of triple-frequency BDS precise point positioning

Guo

Zhang

Wang

et al. 2016

J Geod

112

View full text Add to dashboard Cite

show abstract

“…is the cycle slip magnitude that could be an integer value from 1 to millions of cycles (de Lacey et al 2011). Thus, considering clock jumps and cycle slips, the modified functional models for P and ψ become:…”

Section: Impacts Of Receiver Clock Jump and Cycle Slipmentioning

confidence: 99%

Receiver clock jump and cycle slip correction algorithm for single-frequency GNSS receivers

2019

View full text Add to dashboard Cite

We introduce a simple single-band receiver clock jump and cycle slip (CJCS) detection and correction algorithm suitable for a standalone single-frequency Global Navigation Satellite System (GNSS) receiver. The real-time algorithm involves using an adaptive time differencing technique for the generation of adaptive differenced sequences of single-frequency code and phase observations. The sequences are used for determining thresholds and for the detection and determination of a receiver clock jump and cycle slips. The cycle slip values are fixed by rounding-up float values obtained via weighted least squares adjustment, following the elimination of the receiver's high-order clock drift at every epoch. The performance of this new technique was investigated with simulated cycle slip values and with different types of receiver clock jumps at millisecond and microsecond levels. It achieved 100% detection and correction of all types of receiver clock jumps; between 97 to 100% cycle slip detection; and between 96.9 to 100% cycle slip correction including cycle slips of ±1 cycle, for different rates of observations acquired by different fixed and mobile GNSS receivers. The algorithm thus facilitates precise timing and positioning on standalone low-cost single-frequency GNSS devices. unwanted frequent re-initializations, i.e., an overall reduced level of performance. Here, the authors present a new algorithm for dealing with this CJCS problem on a single-frequency GNSS receiver. Several single-frequency cycle slip correction methods, which are either code-phase based, phase-only based or doppler-inclusive based, exist. A code-phase method is presented in Fath-Allah (2010). This method is limited by the usual code-level errors that often prevent the detection of small cycle slip values. Phase-only methods found in Jia and Wu (2001) and Cosser et al. (2004) are based on 3rd-order differencing or fitting, which have no means of detecting and eliminating receiver clock jumps or achieving reliable detection of cycle slips in data sets with low observation rates. The Doppler-inclusive methods, such as found in Ren et al. (2011), combine Doppler measurements with phase and/or code observations. One drawback with the Doppler-inclusive technique is the inability to detect receiver clock jumps, plus the fact that not all single-frequency GNSS chip sets provide Doppler measurements. Known single-frequency techniques for addressing clock jumps are found in Momoh and Ziebart (2012), which involves phase differencing and code-based thresholding; and in Deo and El-Mowafy (2015), which is based on extrapolation and spline fitting of combined code and phase observations. These two methods are suitable for homogeneous clock jumps v J is at least half the number of satellites used in the clock jump detection, a clock jump is confirmed and its value, * J is computed as ** () v J mode J  (12) where mode is the arithmetic mode operator. Outliers, if any, are excluded from the values in * v J before the mode value is computed. There is no cloc...

show abstract

“…This method has two shortcomings: (1) the use of code measurements may degrade the overall performance due to the their high level noise and multipath and (2) the employment of an adjustment procedure makes the data processing more complex. Some methods using triple frequency GPS signals to detect cycle slips have been proposed, such as [11–13], however the use of dual-frequency GPS receivers still prevails in applications, as not all GPS satellites transmit data in triple frequencies. An automated cycle slip detection and repair method, which is based on ionospheric total electron contents (TEC) rate (TECR) and Melbourne–Wübbena wide-lane (MWWL) linear combination to determine the cycle slip in both the L1 and L2 frequencies was developed by [14].…”

Section: Introductionmentioning

confidence: 99%

Inertial Aided Cycle Slip Detection and Identification for Integrated PPP GPS and INS

Gao

2012

Sensors

View full text Add to dashboard Cite

The recently developed integrated Precise Point Positioning (PPP) GPS/INS system can be useful to many applications, such as UAV navigation systems, land vehicle/machine automation and mobile mapping systems. Since carrier phase measurements are the primary observables in PPP GPS, cycle slips, which often occur due to high dynamics, signal obstructions and low satellite elevation, must be detected and repaired in order to ensure the navigation performance. In this research, a new algorithm of cycle slip detection and identification has been developed. With the aiding from INS, the proposed method jointly uses WL and EWL phase combinations to uniquely determine cycle slips in the L1 and L2 frequencies. To verify the efficiency of the algorithm, both tactical-grade and consumer-grade IMUs are tested by using a real dataset collected from two field tests. The results indicate that the proposed algorithm can efficiently detect and identify the cycle slips and subsequently improve the navigation performance of the integrated system.

show abstract

Real-time cycle slip detection in triple-frequency GNSS

Cited by 87 publications

References 19 publications

Modeling and assessment of triple-frequency BDS precise point positioning

Modeling and assessment of triple-frequency BDS precise point positioning

Receiver clock jump and cycle slip correction algorithm for single-frequency GNSS receivers

Inertial Aided Cycle Slip Detection and Identification for Integrated PPP GPS and INS

Contact Info

Product

Resources

About