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Real-time cycle slip detection in triple-frequency GNSS

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Abstract

The modernization of the global positioning system and the advent of the European project Galileo will lead to a multifrequency global navigation satellite system (GNSS). The presence of new frequencies introduces more degrees of freedom in the GNSS data combination. We define linear combinations of GNSS observations with the aim to detect and correct cycle slips in real time. In particular, the detection is based on five geometry-free linear combinations used in three cascading steps. Most of the jumps are detected in the first step using three minimum-noise combinations of phase and code observations. The remaining jumps with very small amplitude are detected in the other two steps by means of two-tailored linear combinations of phase observations. Once the epoch of the slip has been detected, its amplitude is estimated using other linear combinations of phase observations. These combinations are defined with the aim of discriminating between the possible combinations of jump amplitudes in the three carriers. The method has been tested on simulated data and 1-second triple-frequency undifferenced GPS data coming from a friendly multipath environment. Results show that the proposed method is able to detect and repair all combinations of cycle slips in the three carriers.

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Acknowledgments

This study has been funded by the Spanish Government through the Research Project entitled ``Nuevos algoritmos para el futuro sistema GNSS multifrecuencia’’ with reference AYA2008-02948.

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Authors and Affiliations

  1. Departamento Ingeniería Cartográfica, Geodésica y Fotogrametría, Universidad de Jaén, Jaén, Andalusia, Spain

    Maria Clara de Lacy

  2. DIIAR, Politecnico di Milano, Milan, CO, Italy

    Mirko Reguzzoni

  3. DIIAR, Politecnico di Milano, Polo Regionale di Como, Milan, CO, Italy

    Fernando Sansò

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  1. Maria Clara de Lacy
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  2. Mirko Reguzzoni
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  3. Fernando Sansò
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Correspondence to Maria Clara de Lacy.

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de Lacy, M.C., Reguzzoni, M. & Sansò, F. Real-time cycle slip detection in triple-frequency GNSS. GPS Solut 16, 353–362 (2012). https://doi.org/10.1007/s10291-011-0237-5

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