jgg     2015 35 (4):  680-683    ISSN: 0412-1961  CN: 21-1139/TG C-Location Survey at Xinjiang Astronomical Observatory 25 m VLBI and GPS Station 1 Xinjiang Astronomical Observatory, CAS, 150 First-Kexue Road, Urumqi 830011, China 2 Shanghai Institute of Geological Survey, 930 Lingshi Road, Shanghai 200072, China 3 Shanghai Astronomical Observatory, CAS, 80 Nandan Road, Shanghai 200030, China Received: 2014-06-04  Revised: null  Online: 2015-07-29 Supporting info