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  1. No Access

    Article

    An improved prediction algorithm for Earth’s polar motion with considering the retrograde annual and semi-annual wobbles based on least squares and autoregressive model

    Earth Rotation Parameters (ERP) are indispensable in the transformation between the Celestial Reference Frame and the Terrestrial Reference Frame, and significant for high-precision space navigation and positi...

    Zhangzhen Sun, Tianhe Xu, Chunhua Jiang, Yuguo Yang… in Acta Geodaetica et Geophysica (2019)

  2. No Access

    Article

    GPS/BDS short-term ISB modelling and prediction

    The Chinese BeiDou Navigation Satellite System (BDS) has completed its first milestone by providing coverage of the Asia–Pacific area navigation service since December 27, 2012. With the combination of BDS, th...

    Nan Jiang, Yan Xu, Tianhe Xu, Guochang Xu, Zhangzhen Sun, Harald Schuh in GPS Solutions (2017)

  3. No Access

    Chapter and Conference Paper

    The Tropospheric Product Combination of iGMAS Analysis Centers and the Analysis of Their Precision

    Several analysis centers (AC) and a product integration and service center (ISC) have been built by the international GNSS continuous Monitoring and Assessment System (iGMAS) currently. ISC analyzes the qualit...

    Yuguo Yang, Tianhe Xu, Zhangzhen Sun in China Satellite Navigation Conference (CSN… (2016)

  4. No Access

    Chapter and Conference Paper

    Prediction and Analysis of Chinese Earth Rotation Parameters Based on Robust Least-Squares and Autoregressive Model

    Earth Rotation Parameters (ERP) are the necessary parameters to achieve mutual conversion of the celestial reference frame and earth reference frame. It is the requirements of national economic construction an...

    Zhangzhen Sun, Tianhe Xu, Bing He, Gang Ren in China Satellite Navigation Conference (CSN… (2015)

  5. No Access

    Chapter and Conference Paper

    Prediction of Polar Motion Based on Combination of Weighted Least-Squares and Autoregressive Moving Average

    High accurate prediction of polar motion has important significant and useful value for high-precision space navigation and positioning. In this paper, the weighted least-squares (WLS) is proposed to use to pr...

    Zhangzhen Sun, Tianhe Xu, Yijun Mo… in China Satellite Navigation Conference (CSN… (2014)

  6. No Access

    Article

    An improved adaptive Sage filter with applications in GEO orbit determination and GPS kinematic positioning

    The shortcomings of an adaptive Sage filter are analyzed in this paper. An improved adaptive Sage filter is developed by using a weighted average quadratic form of the historical residuals of observations and ...

    TianHe Xu, Nan Jiang, ZhangZhen Sun in Science China Physics, Mechanics and Astronomy (2012)