Analysis of PCC model dependent periodic signals in GLONASS position time series using Lomb_Scargle periodogram

Abstract

Exactly in November 2006 (GPS week 1400), the IGS analysis centers switched from using relative to absolute corrections. At the same time, also the EUREF analysis centers made this switch. Many research groups have evaluated the influence of the usage of relative PCC with respect to absolute PCC on the EPN site coordinates. The authors demonstrated the significant influences of the conversion from relative to absolute PCC. Maximum changes in height of about 30 mm occurred at some sites. The impact of switching from the type-mean to individual calibration model was also analyzed but so far in GPS-only mode. In the paper, the authors compared station positions estimated using GLONASS-only observations when type-mean and individual calibration models were applied. The impact of switching between these models was investigated using one year of observations collected at eight selected ASG-EUPOS station. Post-processing was done using PPP technique in daily observation mode and in pseudo-kinematic mode (15 minutes session). The authors demonstrated that the position offsets in daily observation resulting from the use of individual calibrations instead of type mean igs08.atx calibrations could reach up to 0.5 cm in the up component, while in the horizontal, the offsets generally stayed below 0.1 cm. In pseudokinematic mode the authors obtained up to 1.0 cm in the up component and 0.5 cm in the horizontal components respectively. It is also demonstrated that the differences in the calibrations models propagate directly into the position domain, affecting daily and sub-daily results and giving visible variations and systematic jumps. To detect the periodicity in our results spectral analysis was used. The LombScargle spectrum calculated for the data revealed that there are strong periodic signals in pseudokinematic results and there is also some periodicity in daily results. ARTICLE INFO

Igs08.atx to igs14.atx change dependent differences in a GNSS- derived position time series

“…If it is assumed (like Rebischung et al, 2011 andBaire et al, 2013) that obtained position component differences are statistically significant, if their satellites or with the number of orbital planes for GLONASS satellites (Meindl, 2011;Sidorov and Teferle, 2013;Dawidowicz and Krzan, 2016;Dawidowicz, 2018). The results obtained for the GLONASS-only solution (Fig.…”

Antenna phase center correction differences from robot and chamber calibrations: the case study LEIAR25

“…Previous research on PCC models indicated that transitions from different types of correction models, e.g., from relative to absolute or from mean to individual, cause noticeable changes in the position components (Baire et al 2013;Dawidowicz and Krzan 2016). In this study, the influence of differences between PCC models derived using a robot (GEO++) and chamber (IGG) methods on GNSS-derived position time series is assessed.…”

Preliminary Results of an Astri/UWM EGNSS Receiver Antenna Calibration Facility

“…The phase centers of global navigation satellite system (GNSS) antennas (receivers and satellites) show biases that should be modeled for precise positioning applications [ 1 , 2 , 3 ]. The real antenna phase center is not fixed, but its location varies depending on the receiving signal’s direction and frequency.…”