GroundStation.RefractionModelType Property

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Description

Refraction model to use. Refraction can only be computed when the Earth is the central body of the GroundStation. The selected refraction model will be used to compute refracted elevation from this GroundStation, affecting the following methods: GroundStation.ElevationR, GroundStation.CommZAspectAngle, GroundStation.TrackingInterference, Spacecraft.Contact, Spacecraft.ContactTimes, and Spacecraft.PassData. The following refraction models are available:

- None.

- Analytic - Chapman. This Earth refraction model is based on analytic Chapman theory.

- Analytic - Interpolation Table. This model is the same as the VisibilitySegment "Analytic - TRORD" model. This Earth refraction model is based on the TRORD refraction model documented in the "Software Requirements Specification for Tracking and Orbit Determination (TRORD) CPCI 202 of the Command and Control Segment Math Appendix", September 1992. This is a troposphere-only refraction model; ionospheric refraction is not modeled. This model uses the local-mean coefficients for each month specified by the GroundStation.RefractivityNs property.

To access additional refraction models, visibility methods, and observer/target object types, use the VisibilityCalculator and VisibilitySegment objects.

Timing Precision Mode

This page describes functionality in nanosecond timing precision mode.

Click here to see the documentation for this object in millisecond timing precision mode.

Attributes

Type:

integer

Access:

read/write

Default Value:

0 ( None )

Valid Values:

Value	Label
0	None
1	Analytic - Chapman
2	Analytic - Interpolation Table

Syntax

myVariable1 = myGroundStation1.RefractionModelType;

myGroundStation1.RefractionModelType = myVariable1;