jgg     2015 35 (3):  373-378    ISSN: 0412-1961  CN: 21-1139/TG Analysing and Comparing the Prediction Performance of Several Satellite  Clock Bias Prediction Models 1 Shool of Geography Spatial Information, Information Engineering University,62 Kexue Road, Zhengzhou 450001,China Received: 2014-05-08  Revised: null  Online: 2015-06-02 Supporting info