jgg     2012 32 (2):  24-27    ISSN: 0412-1961  CN: 21-1139/TG CONCURRENT FLIGHT TEST OF LaCoste & Romberg(LCR) AIRBORNE GRAVIMETER ⅡAND Ⅰ SYSTEM Sun Zhongmiao; Zhai Zhenhe; Li Yingchun ;and Xiao Yun Xi’an Research Institute of Surveying and Mapping, Xi’an 710054 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null