Accuracy Evaluation of Ionospheric Delay from Multi-Scale Reference Networks and Its Augmentation to PPP during Low Solar Activity
Abstract
:1. Introduction
2. Methods
3. Data and Models
4. Results
4.1. Convergence Analysis of Ambiguity-Float and Ambiguity-Fixed PPP
4.2. Ionospheric Delays Retrival from the Ambiguity-Fixed PPP
4.3. Using of CODE Global Ionosphere Products for PPP Ambiguity Resolution
4.4. PPP-RTK Using Ionospheric Delay from Multi-Scale Networks
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Modeling | Strategies |
---|---|
Observation combination | Raw double-frequency |
Orbits/Clocks/Phase bias | GFZ final orbit/clock products, estimated biases CNES real-time orbit/clock/biases products |
Ionosphere corrections | Iono-No: estimated as unknown parameter Iono-Interp: Interpolated from network side |
Zenith troposphere delay | Estimated as random walk parameter |
Satellite DCB | Corrected using products provided by DLR [24] |
Receiver DCB | Estimated as random unknown parameter |
Elevation cutoff | 7° |
Sampling | 30 s |
Attitude corrections | Steering attitude model for GFZ products Nominal attitude model for CNES PPP |
Ambiguity resolution | Partial ambiguity resolution |
Coordinates | Service side: Static User side: Kinematic |
Station | Receiver Type | Antenna Type | Lon | Lat | Dist. (m) |
---|---|---|---|---|---|
YARR | SEPT POLARX5 | LEIAT504 NONE | 115.3472 | 29.0465 | 20.2 |
YAR3 | SEPT POLARX5 | LEIAR25 NONE | |||
GOP6 | SEPT POLARX5 | LEIAR25.R4 LEIT | 14.7856 | 49.9137 | 4.1 |
GOPE | TRIMBLE SPS855 | TPSCR.G3 TPSH | |||
PRD2 | TPS NET-G5 | NOV750.R4 NONE | −114.2929 | 50.8713 | 77.6 |
PRD3 | TPS NET-G5 | TPSCR.G3 NONE |
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Zhao, L.; Douša, J.; Václavovic, P. Accuracy Evaluation of Ionospheric Delay from Multi-Scale Reference Networks and Its Augmentation to PPP during Low Solar Activity. ISPRS Int. J. Geo-Inf. 2021, 10, 516. https://doi.org/10.3390/ijgi10080516
Zhao L, Douša J, Václavovic P. Accuracy Evaluation of Ionospheric Delay from Multi-Scale Reference Networks and Its Augmentation to PPP during Low Solar Activity. ISPRS International Journal of Geo-Information. 2021; 10(8):516. https://doi.org/10.3390/ijgi10080516
Chicago/Turabian StyleZhao, Lewen, Jan Douša, and Pavel Václavovic. 2021. "Accuracy Evaluation of Ionospheric Delay from Multi-Scale Reference Networks and Its Augmentation to PPP during Low Solar Activity" ISPRS International Journal of Geo-Information 10, no. 8: 516. https://doi.org/10.3390/ijgi10080516