jgg     2011 31 (4):  99-102    ISSN: 0412-1961  CN: 21-1139/TG OPTIMIZATION AND SELECTION OF GPS TRIPLE-CARRIES PHASE COMBINATION OBSERVATIONS BASED SELF-ADAPTIVE CLUSTERING ALGORITHM Huang Lingyong; Song Lijie ;and Liu Xiandong Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null