Update Spacecraft Parameters RPO Sequence
The Update Spacecraft Parameters RPO sequence updates some important spacecraft parameters including:
- drag coefficient
- solar radiation pressure (SRP) coefficient
- drag area
- SRP area
- dry mass
- fuel mass
If the parameters for the target and chase satellites are different, then the forces acting on them will have unequal effects (differential forces).
The following picture shows an initial state on the VBar with matched force models and propagated for one rev. Then the dry mass is decremented 150 kg on the chase satellite and propagated for another rev.
Sequence parameters
| Option | Description |
|---|---|
| Modify Cd | Enter, as a Boolean, whether to update the coefficient of drag (true) or not (false). |
| Cd | Enter, as a double, the coefficient of drag. |
| Modify Cr | Enter, as a Boolean, whether to update the coefficient of reflectivity (true) or not (false). |
| Cr | Enter, as a double, the coefficient of reflectivity. |
| Modify_Fuel_Mass | Enter, as a Boolean, whether to update the fuel mass (true) or not (false). |
| Fuel_Mass | Enter the fuel mass. |
| Modify_Dry_Mass | Enter, as a Boolean, whether to update the dry mass (true) or not (false). |
| Dry_Mass | Enter the dry mass. |
| Modify_Drag_Area | Enter, as a Boolean, whether to update the drag area (true) or not (false). |
| Drag_Area | Enter the drag area. |
| Modify_SRP_Area | Enter, as a Boolean, whether to update the SRP area (true) or not (false). |
| SRP_Area | Enter the SRP area. |
| Modify_Ck | Enter, as a Boolean, whether to update the radiation pressure coefficient (true) or not (false). |
| Ck | Enter the radiation pressure coefficient. |
| Modify_Radiation_Pressure_Area | Enter, as a Boolean, whether to update the radiation pressure area (true) or not (false). |
| Radiation_Pressure_Area | Enter the radiation pressure area. |