jgg     2012 32 (3):  55-58    ISSN: 0412-1961  CN: 21-1139/TG MEASURING METHOD FOR LINK SHIELD GUIDING SYSTEM Pan Guorong 1,2) ; Bai Yun 1) ; and Li Huaifeng 1) 1)Department of Surveying and Geo-informatics, Tongji University, Shanghai 200092;2)Key Laboratory of Modern Engineering Surveying, SBSM, Shanghai 200092 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null