jgg     2014 34 (6):  131-134    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON PROPERTIES OF NOISE ANALYSIS WITH ALLAN VARIANCE School of Geodesy and Geomatics，Wuhan University，Wuhan 430079 Received: 2013-12-10  Revised: null  Online: 2014-12-09 Supporting info