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

Krzan, Grzegorz; Dawidowicz, Karol; Wielgosz, Paweł

doi:10.1007/s10291-020-0957-5

Cited by 14 publications

(11 citation statements)

References 13 publications

(14 reference statements)

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“…Hence, the values of GPS L1 and L2 were used for BDS data analysis. To overcome the dilemma, the independent PCO/PCV calibrations for BDS and Multi-GNSS signals were conducted and reported (Su et al, 2018;Wang et al, 2020a;Kröger et al, 2021;Krzan et al, 2020;Willi et al, 2020). The PCCs for GPS and BDS signals using the robotic method were calibrated (Su et al 2018).…”

Section: Phase Center Correctionmentioning

confidence: 99%

Precise orbit determination for BDS satellites

et al. 2022

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Since the first pair of BeiDou satellites was deployed in 2000, China has made continuous efforts to establish its own independent BeiDou Navigation Satellite System (BDS) to provide the regional radio determination satellite service as well as regional and global radio navigation satellite services, which rely on the high quality of orbit and clock products. This article summarizes the achievements in the precise orbit determination (POD) of BDS satellites in the past decade with the focus on observation and orbit dynamic models. First, the disclosed metadata of BDS satellites is presented and the contribution to BDS POD is addressed. The complete optical properties of the satellite bus as well as solar panels are derived based on the absorbed parameters as well the material properties. Secondly, the status and tracking capabilities of the L-band data from accessible ground networks are presented, while some low earth orbiter satellites with onboard BDS tracking capability are listed. The topological structure and measurement scheme of BDS Inter-Satellite-Link (ISL) data are described. After highlighting the progress on observation models as well as orbit perturbations for BDS, e.g., phase center corrections, satellite attitude, and solar radiation pressure, different POD strategies used for BDS are summarized. In addition, the urgent requirement for error modeling of the ISL data is emphasized based on the analysis of the observation noises, and the incompatible characteristics of orbit and clock derived with L-band and ISL data are illuminated and discussed. The further researches on the improvement of phase center calibration and orbit dynamic models, the refinement of ISL observation models, and the potential contribution of BDS to the estimation of geodetic parameters based on L-band or ISL data are identified. With this, it is promising that BDS can achieve better performance and provides vital contributions to the geodesy and navigation.

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Section: Phase Center Correctionmentioning

confidence: 99%

Precise orbit determination for BDS satellites

et al. 2022

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“…By studying the distribution of the dPCCs, one can preliminary predict its impact height (azimuthal symmetry of dPCCs) and its horizontal component (azimuthal asymmetry of dPCCs) [ 36 ]. Such a pattern in dPCCs was already tested by [ 24 , 37 ] for the LEIAR25 antennas, and their results were very promising. In our case, azimuthal symmetry occurred for the majority of the antennas in the dPCCs (E05 minus G02).…”

Section: Resultsmentioning

confidence: 95%

“…An example is the calibrations performed by the University of Bonn, Institute of Geodesy and Geoinformation [ 20 ]. The compatibility between chamber calibrations and robot calibrations is on a millimeter level [ 18 ], and is constantly the subject of discussion and analysis [ 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Using GPS L2 Receiver Antenna Corrections for the Galileo E5a Frequency on Position Estimates

Araszkiewicz

Kiliszek

2020

Sensors

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Knowledge of Global Navigation Satellite System (GNSS) antenna phase center variations plays a key role in precise positioning. Proper modeling is achieved by accessing antenna phase center corrections, which are determined in the calibration process. For most receiver antenna types, the International GNSS Service provides such corrections for two GPS and GLONASS carrier signals. In the case of Galileo, access to phase center corrections is difficult; only antennas calibrated in the anechoic chambers have available corrections for Galileo frequencies. Hence, in many of the studies, GPS-dedicated corrections are used for these Galileo frequencies. Differential analysis was conducted in this study to evaluate the impact of such change. In total, 25 stations belonging to the EUREF Permanent Network and equipped with individual calibrated antennas were the subject of this research. The results for both the absolute and relative positioning methods are clear: using GPS L2 corrections for Galileo E5a frequency causes a bias in the estimated height of almost 8 mm. For the horizontal component, a significant difference can be noticed for only one type of antenna.

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“…Accurate PCCs are a key element, especially in field of geodesy, where GNSS measurements are used to establish reference frames [ 9 , 10 ]. The results of many studies [ 1 , 11 , 12 , 13 ] prove that the omission of antenna calibration correction or use of incorrect correction significantly affects results. In [ 1 , 12 ], the authors demonstrated the differences in position results as caused by using mean calibrations instead of individual calibrations, where the differences can reach up to 1 cm in the up component and for the horizontal components are generally below 4 mm.…”

Section: Introductionmentioning

confidence: 99%

“…The results of many studies [ 1 , 11 , 12 , 13 ] prove that the omission of antenna calibration correction or use of incorrect correction significantly affects results. In [ 1 , 12 ], the authors demonstrated the differences in position results as caused by using mean calibrations instead of individual calibrations, where the differences can reach up to 1 cm in the up component and for the horizontal components are generally below 4 mm. In [ 13 ], the latest changes, improvements, and deficiencies of PCC models were presented.…”

Section: Introductionmentioning

confidence: 99%

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

Dawidowicz

Rapiński

Śmieja

et al. 2021

Sensors

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In 2019, the University of Warmia and Mazury in Olsztyn, in cooperation with Astri Polska, started a European Space Agency (ESA) project. The purpose of the project is the development and implementation of a field calibration procedure for a multi-frequency and multi-system global navigation satellite system (GNSS). The methodology and algorithms proposed in the project are inspired by the “Hannover” concept of absolute field receiver antenna calibration; however, some innovations are introduced. In our approach, the antenna rotation point is close to the nominal mean phase center (MPC) of the antenna, although it does not coincide with it. Additionally, a National Marine Electronics Association local time zone (NMEA ZDA) message is used to synchronize the robot with the GNSS time. We also propose some modifications in robot arm movement scenarios. Our first test results demonstrate consistent performance for the calibration strategy and calibration procedure. For the global positioning system (GPS) L1 frequency, the calibration results show good agreement with the IGS-type mean values. For high satellite elevations (20°–90°), the differences do not exceed 1.5 mm. For low elevation angles (0°–20°), the consistency of the results is worse and the differences exceed a 3 mm level in some cases.

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

Cited by 14 publications

References 13 publications

Precise orbit determination for BDS satellites

Precise orbit determination for BDS satellites

Impact of Using GPS L2 Receiver Antenna Corrections for the Galileo E5a Frequency on Position Estimates

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

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