jgg     2010 30 (第3期):  142-146    ISSN: 0412-1961  CN: 21-1139/TG ERROR EFFECT OF DISTURBING GRAVITY VECTOR ON INERTIAL NAVIGATION SYSTEM Li Shanshan; Wu Xiaoping ;and Wang Kai Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null