GNSS Observations

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.

See Also