Details
| Original language | English |
|---|---|
| Title of host publication | Gravity, Positioning and Reference Frames - Proceedings of the IAG Symposia - GGHS2022 |
| Editors | Jeffrey T. Freymueller, Laura Sánchez |
| Place of Publication | Berlin |
| Publisher | Springer Nature |
| Pages | 101-108 |
| Number of pages | 8 |
| ISBN (print) | 9783031638541 |
| Publication status | Published - 2024 |
Publication series
| Name | International Association of Geodesy Symposia |
|---|---|
| Volume | 156 |
| ISSN (Print) | 0939-9585 |
| ISSN (electronic) | 2197-9359 |
Abstract
The role of codephase center corrections (CPC), also known as group delay variations (GDV), becomes more important nowadays, e.g. in navigation applications or ambiguity resolution. CPC are antenna dependent delays of the received codephase. They are varying with the angle of arrival of the signal at the GNSS antenna, i.e. with azimuth and elevation. CPC can be determined with a robot in the field with a similar approach as used for phase center corrections (PCC) for carrierphase measurements. The big challenge in the estimation of reliable CPC pattern is to deal with relatively noisy codephase observations compared to the correction magnitude. A better repeatability can be reached by reducing the overall codephase noise. One possibility to do this is to understand and improve the tracking loops of the receiver, especially the loop filters, within the calibration process. Due to highly dynamic stress caused by the fast robot motion, a perfect tracking of the GNSS signals is challenging. In this paper, a detailed look on the impact of different loop filter settings, like the noise bandwidth, the filter order or the use of an aided or unaided delay lock loop, on the time differenced single differences is done. To this end, an antenna calibration experiment was carried out, where, in addition to the hardware receivers, the IFEN Sx3 software receiver was used. The software receiver allows to change the settings in post-processing. The experiment shows, that the noise of the observations can be reduced by decreasing the noise bandwidth, but pattern information can be lost by using a bandwidth, which is too small. The trade-off between a small bandwidth and consequently less overall noise and the signal dynamics, caused by the fast robot motion, must be chosen carefully. At the end, an improvement in the pattern repeatability from 99.2 mm, using a hardware receiver, to 65.6 mm, using a software receiver with carefully chosen parameters, can be achieved.
Keywords
- Absolute antenna calibration, Code phase corrections, Group delay variation, Loop filter, Codephase center correction, Group delay variations
ASJC Scopus subject areas
- Engineering(all)
- Mathematics(all)
- Applied Mathematics
- Earth and Planetary Sciences(all)
- Computers in Earth Sciences
- Earth and Planetary Sciences(all)
- Geophysics
Research Area (based on ÖFOS 2012)
- TECHNICAL SCIENCES
- Environmental Engineering, Applied Geosciences
- Geodesy, Surveying
- Navigation systems
- NATURAL SCIENCES
- Mathematics
- Mathematics
- Mathematical modelling
- TECHNICAL SCIENCES
- Environmental Engineering, Applied Geosciences
- Geodesy, Surveying
- Satellite geodesy
Cite this
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- BibTeX
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Gravity, Positioning and Reference Frames - Proceedings of the IAG Symposia - GGHS2022. ed. / Jeffrey T. Freymueller; Laura Sánchez. Berlin: Springer Nature, 2024. p. 101-108 (International Association of Geodesy Symposia; Vol. 156).
Research output: Chapter in book/report/conference proceeding › Contribution to book/anthology › Research › peer review
}
TY - CHAP
T1 - On the Impact of GNSS Receiver Settings on the Estimation of Codephase Center Corrections
AU - Breva, Yannick
AU - Kröger, Johannes
AU - Kersten, Tobias
AU - Schön, Steffen
N1 - Publisher Copyright: © The Author(s) 2023.
PY - 2024
Y1 - 2024
N2 - The role of codephase center corrections (CPC), also known as group delay variations (GDV), becomes more important nowadays, e.g. in navigation applications or ambiguity resolution. CPC are antenna dependent delays of the received codephase. They are varying with the angle of arrival of the signal at the GNSS antenna, i.e. with azimuth and elevation. CPC can be determined with a robot in the field with a similar approach as used for phase center corrections (PCC) for carrierphase measurements. The big challenge in the estimation of reliable CPC pattern is to deal with relatively noisy codephase observations compared to the correction magnitude. A better repeatability can be reached by reducing the overall codephase noise. One possibility to do this is to understand and improve the tracking loops of the receiver, especially the loop filters, within the calibration process. Due to highly dynamic stress caused by the fast robot motion, a perfect tracking of the GNSS signals is challenging. In this paper, a detailed look on the impact of different loop filter settings, like the noise bandwidth, the filter order or the use of an aided or unaided delay lock loop, on the time differenced single differences is done. To this end, an antenna calibration experiment was carried out, where, in addition to the hardware receivers, the IFEN Sx3 software receiver was used. The software receiver allows to change the settings in post-processing. The experiment shows, that the noise of the observations can be reduced by decreasing the noise bandwidth, but pattern information can be lost by using a bandwidth, which is too small. The trade-off between a small bandwidth and consequently less overall noise and the signal dynamics, caused by the fast robot motion, must be chosen carefully. At the end, an improvement in the pattern repeatability from 99.2 mm, using a hardware receiver, to 65.6 mm, using a software receiver with carefully chosen parameters, can be achieved.
AB - The role of codephase center corrections (CPC), also known as group delay variations (GDV), becomes more important nowadays, e.g. in navigation applications or ambiguity resolution. CPC are antenna dependent delays of the received codephase. They are varying with the angle of arrival of the signal at the GNSS antenna, i.e. with azimuth and elevation. CPC can be determined with a robot in the field with a similar approach as used for phase center corrections (PCC) for carrierphase measurements. The big challenge in the estimation of reliable CPC pattern is to deal with relatively noisy codephase observations compared to the correction magnitude. A better repeatability can be reached by reducing the overall codephase noise. One possibility to do this is to understand and improve the tracking loops of the receiver, especially the loop filters, within the calibration process. Due to highly dynamic stress caused by the fast robot motion, a perfect tracking of the GNSS signals is challenging. In this paper, a detailed look on the impact of different loop filter settings, like the noise bandwidth, the filter order or the use of an aided or unaided delay lock loop, on the time differenced single differences is done. To this end, an antenna calibration experiment was carried out, where, in addition to the hardware receivers, the IFEN Sx3 software receiver was used. The software receiver allows to change the settings in post-processing. The experiment shows, that the noise of the observations can be reduced by decreasing the noise bandwidth, but pattern information can be lost by using a bandwidth, which is too small. The trade-off between a small bandwidth and consequently less overall noise and the signal dynamics, caused by the fast robot motion, must be chosen carefully. At the end, an improvement in the pattern repeatability from 99.2 mm, using a hardware receiver, to 65.6 mm, using a software receiver with carefully chosen parameters, can be achieved.
KW - Absolute Antennenkalibrierung
KW - Codephasenzentrumskorrekturen
KW - Group Delay Variations
KW - Loop filter
KW - Absolute antenna calibration
KW - Code phase corrections
KW - Group delay variation
KW - Loop filter
KW - Codephase center correction
KW - Group delay variations
UR - http://www.scopus.com/inward/record.url?scp=85200666459&partnerID=8YFLogxK
U2 - 10.1007/1345_2023_206
DO - 10.1007/1345_2023_206
M3 - Contribution to book/anthology
SN - 9783031638541
T3 - International Association of Geodesy Symposia
SP - 101
EP - 108
BT - Gravity, Positioning and Reference Frames - Proceedings of the IAG Symposia - GGHS2022
A2 - Freymueller, Jeffrey T.
A2 - Sánchez, Laura
PB - Springer Nature
CY - Berlin
ER -