jgg     2009 29 (5):  62-67    ISSN: 0412-1961  CN: 21-1139/TG COMPARISON BETWEEN TRAJECTORY DISTURBING GRAVITY CALCULATED WITH EARTH GRAVITY FIELD MODELS OF EGM96 AND EGM2008 Liu Xiaogang1）;Wu Xiaoping1）;Zhao Dongming1）; and Wu Xing1，2） 1）Institute of Surveying and Mapping，Information and Engineering University，Zhengzhou 450052  2）63926 Troops，Beijing 100085 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null