DETERMINATION OF PRIOR WEIGHT RATIO FOR COMBINED GPS-BD2 POSITIONING BASED ON VARIANCE COMPONENT ESTIMATION
1)School of Geoscience and InfoPhysics, Central South University, Changsha 410083
2)Key Laboratory of Precise Engineering of Surveying & Deformation Disaster Monitoring of Hunan Province, Changsha 410083
Abstract The optimum weight ratio of different observation values should be obtained in combined GPSBD2 positioning since there is a systematic difference between GPS and BD2. The variance component estimation（VCE） formula is used to determine the varianceratios of GPS and BD2 observations in the pseudorange single point positioning and phase relative positioning. The statistics of RMS of positioning errors with different weight ratios indicate that the results of VCE are reasonable and the prior weight ratios of GPSBD2 pseudorange and phase observations can be 2∶1 and 1∶1 respectively.
Gao Xiao,Dai Wujiao. DETERMINATION OF PRIOR WEIGHT RATIO FOR COMBINED GPS-BD2 POSITIONING BASED ON VARIANCE COMPONENT ESTIMATION[J]. jgg, 2013, 33(2): 136-138.
Gao Xiao,Dai Wujiao. DETERMINATION OF PRIOR WEIGHT RATIO FOR COMBINED GPS-BD2 POSITIONING BASED ON VARIANCE COMPONENT ESTIMATION[J]. jgg, 2013, 33(2): 136-138.
