jgg     2012 32 (2):  134-138    ISSN: 0412-1961  CN: 21-1139/TG STUDY OF PSEUDOLITES OPTIMIZATION MODEL INGNSS/PSEUDOLITES NAVIGATION AND POSITIONING Jiang Kun; Wang Jian ;and Liu Chao China University of Mining and Technology, Key Laboratory for Land Environment and Disaster Monitoring\= of SBSM,Xuzhou 221116 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null