jgg     2011 31 (3):  85-89    ISSN: 0412-1961  CN: 21-1139/TG ACCURACY ASSESSMENT OF COMBINED SINGLE-FREQUENCY GPS/GLONASS SINGLE POINT POSITIONING Cai Changsheng; Dai Wujiao; Kuang Cuilin ;and Zhu Jianjun Department of Geomatics Engineering, Central South University, Changsha 410083 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null