HPOP Drag
Set options for modeling drag for the HPOP propagator.
Syntax
HPOP <ObjectPath> Drag {DragState} <Coeff> <AreaMassRatio> {"AtmDensModel"} [{LowAltAtmDensityMdl} <DensityBlendingAltRange>]
Related commands
Description
The HPOP Drag command allows you to set drag model options for propagating a satellite's or missile's orbit using the high-precision orbit propagator (HPOP) module.
This command is valid for Satellites and Missiles.
{DragState} can be On or Off.
If {DragState} is On enter <Coeff>, <AreaMassRatio> and {"AtmDensModel"}.
<Coeff> is a real number between -100.0 and 100.0.
<AreaMassRatio> is a real number between 0.0 and 9999.0, and is entered in m^2/kg.
Valid values for {"AtmDensModel"} and their associated <Parameters> are outlined in the Table below. The table also lists the object(s) for which each model is valid. Only atmosphere models that are valid to the ground can be used for missiles.
Enter {LowAltAtmDensityMdl} and <DensityBlendingAltRange> to specify values for low altitude atmospheric density model. If included, both values must be entered.
{LowAltAtmDensityMdl} is the lower altitude atmospheric density model. Valid values are "MSISE 1990" and "NRLMSISE 2000".
<DensityBlendingAltRange> is the range of overlap for which the density models will be blended. This is a real number between 0.0 and 1000.0km. Enter the value in Connect distance units.
If {DragState} is Off, no other values should be entered.
| {"AtmDensModel"} | <Parameters> | Valid for: |
|---|---|---|
| "Harris-Priester" | Additional values can be set manually or via a flux/geomag file:
| Satellite, Missile |
| "1976 Standard" | N/A | Satellite, Missile |
| "Jacchia 1960" | N/A | Satellite, Missile |
| "Jacchia 1971" | Additional values can be set manually or via a flux/geomag file:
| Satellite |
| "Jacchia 1970" | Satellite | |
| "Jacchia-Roberts" | Satellite | |
| "CIRA 1972" | Satellite | |
| "NRLMSISE 2000" | Satellite, Missile | |
| "MSISE 1990" | Satellite, Missile | |
| "MSIS 1986" | Satellite | |
| "DTM 2012" | Satellite | |
| "DTM 2020" | Satellite | |
| "<UserModelName>" | "<FilePath>" | Satellite |
| "<DensityModelPlugin>" | "<DisplayName>" "<XMLConfigurationSettings>"
Additional values can be set manually or via a flux/geomag file:
If no plugin configuration settings are provided, you must still send an empty string ("") as part of the Connect command. The plugin's configuration settings are stored in a specific XML format (the same format used when saved as part of the Satellite file). That format uses a quote character (") for certain attribute values. These quote characters must be escaped by replacing them with the escape sequence " else the command parser will become confused. While not required, all XML special characters (< >' "&) may be replaced by their XML escape sequences, although the only required character to be escaped is the quote character ("). | Satellite, Missile |
<DailyF10.7> and <AverageF10.7> are real numbers between 40 and 10000.
<GeoMagIndex> is a real number between 0.0 and 10.0.
Currently, the only valid "<UserModelName>" is "SampleDensFunc"
For this command to be valid, the satellite or missile must already be defined as using the HPOP propagator.
To set additional drag model options, see the HPOP Options command.
"<FilePath>" can be the path to a file on your local drive or the path to a file on an SDF server. See Specifying Paths for "<SDFFilePath>" syntax information.
Examples
To turn On the Harris-Priester drag model for the ERS1 satellite with a coefficient of 1.04 and an area/mass ratio of 0.22:
To turn On the MSISE 1990 drag model with a coefficient of 2.08 and an area/mass ratio of 0.175:
To turn On the Jacchia 1971 drag model specifying a flux file:
To use a user defined atmosphere drag model, specifying a flux file:
To set a low altitude atmosphere model with a blending range of 90000.0 m:
Return message
If activated, Connect returns an acknowledgement message.Group membership
This command belongs to the following group(s):
Version
11.6