PropagatorHPOP

class ansys.stk.core.stkobjects.PropagatorHPOP

Bases: IPropagator

Class defining the High Precision Orbit Propagator (HPOP).

Overview

Methods

propagate

Propagates the satellite’s path using the specified time interval.

Properties

step	Step size. Uses Time Dimension.
initial_state	Get the satellite’s initial state.
force_model	Get the force model parameters.
integrator	Get the integrator parameters.
covariance	Get the covariance parameters.
ephemeris_interval	Get the propagator’s ephemeris interval.
display_coordinate_type	The propagator’s display coordinate type.

Examples

Set satellite propagator to HPOP and set force model properties

# Satellite satellite: Satellite object
satellite.set_propagator_type(PropagatorType.HPOP)
satellite.propagator.step = 60
satellite.propagator.initial_state.representation.assign_cartesian(
    CoordinateSystem.FIXED, 6406.92, -1787.59, -506.422, 2.10185, 6.48871, 3.64041
)

forceModel = satellite.propagator.force_model
if os.name == "nt":
    installPath = r"C:\Program Files\AGI\STK 12"
else:
    installPath = os.environ["STK_INSTALL_DIR"]
grv_path = ["STKData", "CentralBodies", "Earth", "WGS84_EGM96.grv"]
forceModel.central_body_gravity.file = os.path.join(installPath, *grv_path)
forceModel.central_body_gravity.maximum_degree = 21
forceModel.central_body_gravity.maximum_order = 21
forceModel.drag.use = True
forceModel.drag.drag_model.cd = 0.01
forceModel.drag.drag_model.area_mass_ratio = 0.01
forceModel.solar_radiation_pressure.use = False

integrator = satellite.propagator.integrator
integrator.do_not_propagate_below_altitude = -1e6
integrator.integration_model = VehicleIntegrationModel.RUNGE_KUTTA_FEHLBERG_78
integrator.step_size_control.method = VehicleMethod.RELATIVE_ERROR
integrator.step_size_control.error_tolerance = 1e-13
integrator.step_size_control.minimum_step_size = 0.1
integrator.step_size_control.maximum_step_size = 30
integrator.interpolation.method = VehicleInterpolationMethod.LAGRANGE
integrator.interpolation.order = 7

satellite.propagator.propagate()

Import detail

from ansys.stk.core.stkobjects import PropagatorHPOP

Property detail

property PropagatorHPOP.step: float

Step size. Uses Time Dimension.

property PropagatorHPOP.initial_state: VehicleInitialState

Get the satellite’s initial state.

property PropagatorHPOP.force_model: VehicleHPOPForceModel

Get the force model parameters.

property PropagatorHPOP.integrator: VehicleIntegrator

Get the integrator parameters.

property PropagatorHPOP.covariance: VehicleCovariance

Get the covariance parameters.

property PropagatorHPOP.ephemeris_interval: ITimeToolTimeIntervalSmartInterval

Get the propagator’s ephemeris interval.

property PropagatorHPOP.display_coordinate_type: PropagatorDisplayCoordinateType

The propagator’s display coordinate type.

Method detail

PropagatorHPOP.propagate(self) → None

Propagates the satellite’s path using the specified time interval.

Returns:

None