jgg     2009 29 (4):  106-110    ISSN: 0412-1961  CN: 21-1139/TG IMPROVING POINT POSITIONING ACCURACY USING GPS CARRIER SMOOTHED PSEUDORANGE Zhang Chengjun; Yang Li ;and Chen Jun Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null