GPS Solutions

, Volume 16, Issue 3, pp 353–362

Real-time cycle slip detection in triple-frequency GNSS

  • Maria Clara de Lacy
  • Mirko Reguzzoni
  • Fernando Sansò
Original Article


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.


Triple-frequency GNSS Cycle slips Minimum-noise combinations 

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Maria Clara de Lacy
    • 1
  • Mirko Reguzzoni
    • 2
  • Fernando Sansò
    • 3
  1. 1.Departamento Ingeniería Cartográfica, Geodésica y FotogrametríaUniversidad de JaénJaénSpain
  2. 2.DIIAR, Politecnico di MilanoMilanItaly
  3. 3.DIIAR, Politecnico di Milano, Polo Regionale di ComoMilanItaly

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