SGP4 Setup

Use this button to set the online options for the SGP4 Propagator.

Option	Description
Use all relevant TLEs	This option will use every available element set in the interval of interest.
Switching Method	Defines when to switch between element sets. Epoch - Switch between element sets based on the epoch of the element. Mid-Point - Switch between element sets based on the mid-point between two element epochs. TCA - Switch between element sets based on the time of closest approach. Calculated by propagating each element of a pair over the time period between their respective epochs, and then determining the point at which the two paths are nearest each other. This option provides the smoothest possible fit between two element sets but may not represent the best estimated state of the vehicle.
Use first relevant TLE	This option will use only the first available element.
TLE File	This will allow you to select an external GP data File. This option is only available when you select Automatic - File.