On this panel, you can decide the handling of the ionospheric delay and the PPP model used during the processing. Furthermore, you can select a multitude of ionosphere models.
2-Frequency-LCs: The ionosphere-free linear combination is built with the first and second processed frequency. If three frequencies are processed, two 2-frequency-IF-LCs are built (first and second, first and third frequency).
3-Frequency-LC: A three-frequency ionosphere-free linear combination (3-frequency-IF-LC) is build.
Estimate with ... as constraint: The slant ionospheric delay is estimated on the first processed frequency. Furthermore, ionospheric pseudo-observations are used to constrain the estimation of the ionospheric delay.
Correct with …: The ionospheric delay is calculated from an ionosphere model. The code and phase observations are corrected. Please note that the ionosphere model's imperfections might degrade the estimated parameters' accuracy. However, this option might be useful for single-frequency or simulated data.
Estimate: The ionospheric delay on the first processed frequency is estimated. Please note that there is a rank deficiency between the ionospheric delay and the receiver code biases. If both are estimated, the estimated values are contaminated from each other.
Estimate, decoupled clock: The receiver clock is decoupled for code and phase observations. Furthermore, the contaminated ionospheric delay on the first frequency is estimated. Please check this publication from Naciri and Bisnath (and others).
Off: No correction for the ionospheric delay is used. The raw observations are processed (no LC). This option is only recommended for simulated data.
IONEX File: Select corrections for the ionospheric delay from an IONEX file.
Klobuchar model: Part of the GPS broadcast navigation message.
NeQuick model: Part of the Galileo broadcast navigation message.
CODE Spherical Harmonics: Ionosphere model based on spherical harmonics from CODE
VTEC from Correction Stream: The ionospheric model of the correction stream is used (spherical harmonics).
Source: Select the source of the Ionex File. The GIMs of various ACs can be selected. Furthermore, IGS RT GIM corresponds to the IGS experimental combined real-time GIM (http://chapman.upc.es/irtg/). Please note that the ionosphere models ‘Regiomontan’ and 'GIOMO' are calculated at TU Wien and are currently not publicly available.
Auto-Detection: Define the file name of the IONEX file using pseudo-code. Furthermore, you have to determine the folder of the IONEX Auto-Detection. Choose either automatic folder (IONEX files are located in the corresponding /DATA/IONEX/yyyy/doy folder) or manual folder (hardcode the folder path, all IONEX files are located in this folder). This option is useful for batch processing with multiple days.
manually: Choose an IONEX File manually.
Choose the type of the IONEX product (e.g., rapid, final). Note that the availability of these types depends on the selected AC.
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