HPOP Options
Set options for the HPOP force model
Syntax
HPOP <ObjectPath> Options {ForceModelOption} <ModelParameters>
Related commands
Description
The HPOP Options command enables you to set additional force model options to control certain settings that influence the propagation of a satellite's or missile's orbit using the High-Precision Orbit Propagator (HPOP) module.
This command is valid for Satellites and Missiles.
{ForceModelOption} and <ModelParameters> are:
| {ForceModelOption} | <ModelParameters> | Description |
|---|---|---|
| ApproxAltForDrag | {On | Off} | Set flag for the drag model to use an approximate expression to determine altitude, instead of finding the exact altitude, when computing density. |
| ApparentSunForDrag | {On | Off} | Set flag to use apparent sun position rather than true sun position. |
| SunPositionMethod | {True | Apparent | ApparentToTrueCB} | Specify the direction of the Sun for SRP computations. |
| AtmoAltitude | <Altitude> | <Altitude> is entered in Connect distance units and is between 0.001 and 1000.0. |
| AltitudeCutoff | <Altitude> | Set the minimum altitude for propagation. <Altitude> is entered in Connect distance units and is between 0.0 and 1000000.0. |
| Mass | <MassValue> | Enter a satellite mass to be used in atmospheric drag and solar radiation pressure calculations.
<MassValue> is entered in Scenario mass units and is greater than 0.0.
This option has no effect on the Drag area-to-mass ratio, but the SRP area-to-mass ratio will update so that the SRP Area remains the same using the updated mass value. |
| FluxUpdate | {Daily | 3Hour | 3HourInterp | 3HourCubicSpline} | Set the frequency for updating geomagnetic flux values, when using a flux file to compute density for drag.
For MSIS atmospheric density models, the computational method uses a slightly different algorithm for Daily versus 3Hour. |
| IncludeRelAccel | {On | Off} | Set flag to include relativistic accelerations. |
| PropPlugin | {On | Off} ["<PropPluginName>"] | Specify a registered single force model plugin for the customization of the accelerations used in the propagation of the satellite trajectory. The "<PropPluginName>" is required if On is selected. |
| GeoMagFluxSource | {Kp | Ap} | Specify whether to use the kp or ap data from the flux file. |
For this command to be valid, the satellite or missile must already be defined as using the HPOP propagator.
Examples
To use apparent sun position and specify Apparent for the direction of the Sun for SRP computations:
To set the minimum altitude for propagation to 300.0 meters:
Return message
Group membership
This command belongs to the following group(s):
Version
9.0