A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Satellite antenna phase center offsets and scale errors in GPS solutions
Abstract. ITRF2000 solutions have shown that there are parts-per-billion (ppb)-level scale differences between GPS and other techniques, as well as among various GPS analysis centers (ACs). The trends of the scale differences reach 0.2 ppb per year. It is demonstrated that the uncertainty in the satellite antenna phase center offset (z-direction) is one of the major reasons for the scale differences. The scale change caused by an error in the z_offset can be approximately expressed as: scale change (in ppb)=7.8 × error of z_offset (in meters). Changing the z_offset value of the BLOCK II and IIA satellites from 102 to 95 cm could produce a 0.5-ppb scale variation. For BLOCK IIR satellites the uncertainty of the z_offset is much larger. The number of these satellites increases each year. The accuracy of IGS products could be significantly affected if this problem is not properly solved. Besides scale, satellite antenna phase center uncertainties have perceptible effects on also the clock, zenith path delay, and other solved-for parameters.
Satellite antenna phase center offsets and scale errors in GPS solutions
Abstract. ITRF2000 solutions have shown that there are parts-per-billion (ppb)-level scale differences between GPS and other techniques, as well as among various GPS analysis centers (ACs). The trends of the scale differences reach 0.2 ppb per year. It is demonstrated that the uncertainty in the satellite antenna phase center offset (z-direction) is one of the major reasons for the scale differences. The scale change caused by an error in the z_offset can be approximately expressed as: scale change (in ppb)=7.8 × error of z_offset (in meters). Changing the z_offset value of the BLOCK II and IIA satellites from 102 to 95 cm could produce a 0.5-ppb scale variation. For BLOCK IIR satellites the uncertainty of the z_offset is much larger. The number of these satellites increases each year. The accuracy of IGS products could be significantly affected if this problem is not properly solved. Besides scale, satellite antenna phase center uncertainties have perceptible effects on also the clock, zenith path delay, and other solved-for parameters.
Satellite antenna phase center offsets and scale errors in GPS solutions
Zhu, S. Y. (author) / Massmann, F.-H. (author) / Yu, Y. (author) / Reigber, Ch. (author)
Journal of Geodesy ; 76
2003
Article (Journal)
English
BKL:
38.73
Geodäsie
Estimation of satellite antenna phase center offsets for Galileo
| Online Contents | 2016
Estimation of satellite antenna phase center offsets for Galileo
| Online Contents | 2016
Satellite antenna phase center errors: magnified threat to multi-frequency PPP ambiguity resolution
| Online Contents | 2021