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11 Result(s)

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  1. No Access

    Article

    Alternative formulae for robust Weighted Total Least-Squares solutions for Errors-In-Variables models

    Weighted Total Least-Squares (WTLS) can optimally solve the issue of parameter estimation in the Errors-In-Variables (EIV) model; however, this method is relatively sensitive to outliers that may exist in the ...

    Zhipeng Lv, Lifen Sui in Studia Geophysica et Geodaetica (2021)

  2. No Access

    Article

    The BAB algorithm for computing the total least trimmed squares estimator

    Robust estimation in the errors-in-variables (EIV) model remains a difficult problem because of the leverage point and the masking effect and swam** effect. In this contribution, a new robust estimator is in...

    Zhipeng Lv, Lifen Sui in Journal of Geodesy (2020)

  3. No Access

    Article

    Variance-covariance component estimation for structured errors-in-variables models with cross-covariances

    In this contribution, an iterative algorithm for variance-covariance component estimation based on the structured errors-in-variables (EIV) model is proposed. We introduce the variable projection principle and...

    Zhipeng Lv, Lifen Sui in Studia Geophysica et Geodaetica (2019)

  4. No Access

    Article

    Computationally efficient dual-frequency uncombined precise orbit determination based on IGS clock datum

    Using uncombined (UC) or undifferenced original observations has become a research topic in the global navigation satellite system (GNSS) community. This far, precise orbit determination (POD) with ionospheric...

    Tian Zeng, Lifen Sui, Guorui **ao, Rengui Ruan, **aolin Jia in GPS Solutions (2019)

  5. No Access

    Article

    Analysis of Galileo/BDS/GPS signals and RTK performance

    New satellites and signals become available with the modernization of GNSS, especially for Galileo and BDS. The current Galileo constellation comprises 4 IOV (in-orbit validation) and 14 FOC (full operational ...

    Yijun Tian, Lifen Sui, Guorui **ao, Dongqing Zhao, Yuan Tian in GPS Solutions (2019)

  6. No Access

    Article

    Estimating and assessing Galileo satellite fractional cycle bias for PPP ambiguity resolution

    Due to the rapid deployment of the Galileo constellation, Galileo is now able to contribute to GNSS precise point positioning (PPP) ambiguity resolution (AR) with 17 operational satellites as of December 2017....

    Guorui **ao, Pan Li, Lifen Sui, Bernhard Heck, Harald Schuh in GPS Solutions (2018)

  7. No Access

    Article

    Estimating satellite phase fractional cycle biases based on Kalman filter

    Phase fractional cycle biases (FCBs) originating from satellites and receivers destroy the integer nature of PPP carrier phase ambiguities. To achieve integer ambiguity resolution of PPP, FCBs of satellites ar...

    Guorui **ao, Lifen Sui, Bernhard Heck, Tian Zeng, Yuan Tian in GPS Solutions (2018)

  8. No Access

    Article

    Real-time triple-frequency cycle slip detection and repair method under ionospheric disturbance validated with BDS data

    In order to resolve the real-time cycle slip detection and repair problem with the data under ionospheric disturbance and low sample rate, a new method is proposed by using triple-frequency combinations. First...

    Tian Zeng, Lifen Sui, Yangyin Xu, **aolin Jia, Guorui **ao, Yuan Tian… in GPS Solutions (2018)

  9. No Access

    Article

    Improved time-differenced cycle slip detect and repair for GNSS undifferenced observations

    GNSS undifferenced signal processing, in which the individual signal of each frequency is treated as independent observable, has drawn increasing interest in GNSS community. However, undifferenced signal proce...

    Guorui **ao, Michael Mayer, Bernhard Heck, Lifen Sui, Tian Zeng… in GPS Solutions (2017)

  10. No Access

    Chapter and Conference Paper

    Unscented Kalman Filter Algorithm with Colored Noise and Its Application in Spacecraft Attitude Estimation

    The accuracy and reliability of the estimation and prediction of satellite attitude are affected by not only the random noise and systematic errors, but also the colored noise related to time. Any theory or te...

    Lifen Sui, Zhongkai Mou, Yu Gan… in The 1st International Workshop on the Qual… (2015)

  11. No Access

    Article

    Study on the detection of abnormal sounding data based on LS-SVM

    A new method of detecting abnormal sounding data based on LS-SVM is presented. The theorem proves that the trend surface filter is the especial result of LS-SVM. In order to depict the relationship of trend su...

    **anyuan Huang, Guojun Zhai, Lifen Sui, Hongzhou Chai in Acta Oceanologica Sinica (2010)