jgg     2007 27 (4):  16-20    ISSN: 0412-1961  CN: 21-1139/TG INVESTIGATION ON URBAN GROUND DEFORMATION DETECTION THROUGH THREE PASS DIFFERENTIAL INTERFEROMETRY Luo Xiaojun; Liu Guoxiang; and Huang Dingfa Dept. of Surveying Engineering, Southwest Jiaotong University, Chengdu 610031 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null