jgg     2010 30 (1):  51-55    ISSN: 0412-1961  CN: 21-1139/TG GRAVITY FIELD RECOVERY BY USING ENERGY CONSERVATION APPROACH You Wei;Fan Dongming ;and Guo Jiang Department of Surveying，Southwest Jiaotong University，Chengdu 610031 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null