jgg     2009 29 (1):  79-82    ISSN: 0412-1961  CN: 21-1139/TG EFFECT OF OBSERVATION NOISE ON DATA FUSION BY FREQUENCY DOMAIN INPUT-OUTPUT METHOD Cui Lilu 1) ; Luo Zhicai 1, 2) ; Zhong Bo 1) ; and Wang Haihong 1,2) 1) School of Geodesy and Geomatics, Wuhan University, Wuhan 4300792) Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null