jgg     2013 33 (4):  137-141    ISSN: 0412-1961  CN: 21-1139/TG A MULTIPATH CORRECTION METHOD BASED ON WAVELET  FILTERING AND PCA 1) School of Geosciences and Info-Physics, Central South University, Changsha 410083 2) Institute of Surveying and Mapping for Geology of Guangdong Province, Guangzhou 510800 Received: 2012-12-14  Revised: null  Online: 2013-08-16 Supporting info