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The GNSS Observation represents a pseudorange observation of a GNSS receiver from a spacecraft. The measurement types available for these observations are denoted by Rinex Measurement Codes. The three-character codes are used to indicate the following:
The measurement codes currently supported in FreeFlyer are noted below:
When working with GNSS Observations, you have the option to enable Measurement Weighting, as well as the option to include the following corrections:
The ionospheric correction calculation relies on the FF_SolarSystem.IonosphereOptions.ScaleFactor property, which can be configured to scale the ionospheric correction values differently for simulating vs. processing. For example, setting this value to 1.5 for data simulation and then to 1 for processing would effectively simulate a 50% error in the ionospheric correction modeling.
The following tracking data formats supported by FreeFlyer can contain GNSS Pseudorange Observations:
For more information on creating simulated GNSS Pseudorange Observations, see the Simulating Tracking Data page.