jgg     2014 34 (5):  101-105    ISSN: 0412-1961  CN: 21-1139/TG COMPARATIVE STUDY ON TWO LONG-BASELINE  AMBIGUITY RESOLUTION METHODS IN APPLICATION OF  BEIDOU/COMPASS TRIPLE-FREQUENCY 1）Institute of Geospatial Information，Information Engineering University，Zhengzhou 450052 2）Institute of Hydrographic Surveying and Charting, Tianjin 300061 3)Guangkong Institute of Survey and Design, Guangzhou 510000 Received: 2013-06-24  Revised: null  Online: 2014-09-26 Supporting info