Weighting Scheme;
Density Ratio;
Variance Matrix;
Noise Term;
Standard Weighting;
D O I:
10.1007/PL00012765
中图分类号:
TP7 [遥感技术];
学科分类号:
081102 ;
0816 ;
081602 ;
083002 ;
1404 ;
摘要:
The noise term of GPS phase data can be calculated from the measured carrier-to-noise power density ratios (C/N0). The C/N0 values are used in the proposed SIGMA-e model to calculate the variance matrix of double-differenced GPS phase data. Examples show the capability of this model to yield higher accuracies for GPS surveys than the use of the standard weighting scheme. Most importantly, the SIGMA-e model allows the use of noisier phase data from very low elevation satellites to overcome poor satellite geometry problems. (c) 1999 John Wiley & Sons, Inc.