Publications related to the GRACE Missions (no abstracts)

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Residual cycle slip detection in real-time quality control for GPS-based kinematic precise orbit determination of LEO satellites

Fu, Wenju, Zhang, Zhaoyang, Zheng, Kai, Tan, Yue, Liu, Kezhong, Dang, Jingyi, and Chen, Ruizhi, 2026. Residual cycle slip detection in real-time quality control for GPS-based kinematic precise orbit determination of LEO satellites. Measurement, 257:118941, doi:10.1016/j.measurement.2025.118941.

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@ARTICLE{2026Meas..25718941F,
       author = {{Fu}, Wenju and {Zhang}, Zhaoyang and {Zheng}, Kai and {Tan}, Yue and {Liu}, Kezhong and {Dang}, Jingyi and {Chen}, Ruizhi},
        title = "{Residual cycle slip detection in real-time quality control for GPS-based kinematic precise orbit determination of LEO satellites}",
      journal = {Measurement},
     keywords = {GPS, Low Earth orbit, Kinematic precise orbit determination, Cycle slip detection, Quality control},
         year = 2026,
        month = jan,
       volume = {257},
          eid = {118941},
        pages = {118941},
     abstract = "{The performance of real-time kinematic precise orbit determination
        (KPOD) of low Earth orbit (LEO) satellites is susceptible to the
        quality of the onboard GPS observations. Since the low-elevation
        observations with considerable noise often appear for LEO
        onboard GPS receivers, detecting all cycle slips during data
        preprocessing is challenging. Thus, we propose an algorithm to
        detect residual cycle slips that cannot be identified during
        data preprocessing, using the posterior residuals of ionosphere-
        free observations. The satellites with continuous carrier phase
        outliers are first detected in the contribution. The posterior
        residuals can be accurately computed after statistical tests
        remove all outliers, and residual cycle slips are identified
        according to the expectation and variance of the time series.
        Experiments show that low-elevation GPS observations of
        GRACE-C/D satellites contain many outliers and small cycle
        slips. Residual cycle slips can be identified from carrier phase
        outliers, and systematic errors can be eliminated by setting new
        ambiguity parameters. The carrier phases are effectively
        utilized to reduce solution reinitializations and orbit error
        jumps. The performance of the GPS-based KPOD, utilizing ultra-
        rapid satellite orbits and real-time clocks, is evaluated.
        Compared to traditional quality control, the one-sigma orbit
        accuracy can be improved by 16.0{\textendash}30.2 \% to about
        4.0 cm for GRACE-C/D satellites when considering the residual
        cycle slip detection. Based on the proposed quality control
        method, GRACE-C/D satellites achieve orbit accuracy close to
        that of Sentinel-3A/B and Swarm-A/B/C satellites.}",
          doi = {10.1016/j.measurement.2025.118941},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2026Meas..25718941F},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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