Package org.orekit.estimation.measurements

Class ObserverSatellite

java.lang.Object

org.orekit.estimation.measurements.AbstractParticipant

org.orekit.estimation.measurements.ObserverSatellite

All Implemented Interfaces:

MeasurementParticipant, Observer, ParameterDriversProvider

public class ObserverSatellite
extends AbstractParticipant
implements Observer

Class that accepts a PVCoordinatesProvider for a space- based measurement receiver.

Since:

14.0

Author:

Brianna Aubin

Field Summary

Fields inherited from interface org.orekit.estimation.measurements.MeasurementParticipant

ACCELERATION_SUFFIX, BIAS_SUFFIX, DRIFT_SUFFIX, OFFSET_SUFFIX

Constructor Summary

Constructors

Constructor	Description
ObserverSatellite(String name, PVCoordinatesProvider pvCoordsProvider)	Simple constructor.
ObserverSatellite(String name, PVCoordinatesProvider pvCoordsProvider, QuadraticClockModel quadraticClock)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
FieldPVCoordinatesProvider<Gradient>	getFieldPVCoordinatesProvider(int freeParameters, Map<String,Integer> parameterIndices)	Return the FieldPVCoordinatesProvider.
Transform	getOffsetToInertial(Frame inertial, AbsoluteDate date, boolean clockOffsetAlreadyApplied)	Get the transform between offset frame and inertial frame.
FieldTransform<Gradient>	getOffsetToInertial(Frame inertial, FieldAbsoluteDate<Gradient> offsetCompensatedDate, int freeParameters, Map<String,Integer> indices)	Get the transform between offset frame and inertial frame with derivatives.
final PVCoordinatesProvider	getPVCoordinatesProvider()	Return the PVCoordinatesProvider.
final boolean	isSpaceBased()	Get the type of object being used in measurement observations.

Methods inherited from class org.orekit.estimation.measurements.AbstractParticipant

addParameterDriver, createEmptyQuadraticClock, extractFieldPVCoordinatesProvider, extractPVCoordinatesProvider, getName, getParametersDrivers, getQuadraticClockModel

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.orekit.estimation.measurements.MeasurementParticipant

getClockAccelerationDriver, getClockBiasDriver, getClockDriftDriver, getFieldOffsetRate, getFieldOffsetValue, getName, getOffsetRate, getOffsetValue, getQuadraticClockModel, getQuadraticFieldClock

Methods inherited from interface org.orekit.estimation.measurements.Observer

getCorrectedReceptionDate, getCorrectedReceptionDateField, getOffsetToInertial

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, getParametersDrivers, isSupported

Constructor Details

ObserverSatellite

public ObserverSatellite(String name,
 PVCoordinatesProvider pvCoordsProvider)

Simple constructor.

Parameters:

name - name of receiver

pvCoordsProvider - satellite propagator

ObserverSatellite

public ObserverSatellite(String name,
 PVCoordinatesProvider pvCoordsProvider,
 QuadraticClockModel quadraticClock)

Simple constructor.

Parameters:

name - name of receiver

pvCoordsProvider - position/velocity coordinates provider for receiver

quadraticClock - clock model for receiver

Method Details

isSpaceBased

public final boolean isSpaceBased()

Get the type of object being used in measurement observations.

Specified by:

isSpaceBased in interface Observer

Returns:

boolean

getPVCoordinatesProvider

public final PVCoordinatesProvider getPVCoordinatesProvider()

Return the PVCoordinatesProvider.

Specified by:

getPVCoordinatesProvider in interface Observer

Returns:

pos/vel coordinates provider

getFieldPVCoordinatesProvider

public FieldPVCoordinatesProvider<Gradient> getFieldPVCoordinatesProvider(int freeParameters,
 Map<String,Integer> parameterIndices)

Return the FieldPVCoordinatesProvider.

Specified by:

getFieldPVCoordinatesProvider in interface Observer

Parameters:

freeParameters - number of estimated parameters

parameterIndices - indices of the estimated parameters in derivatives computations, must be driver

Returns:

pos/vel coordinates provider for values with Gradient field

getOffsetToInertial

public Transform getOffsetToInertial(Frame inertial,
 AbsoluteDate date,
 boolean clockOffsetAlreadyApplied)

Get the transform between offset frame and inertial frame.

The offset frame takes the current position offset, polar motion and the meridian shift into account. The frame returned is disconnected from later changes in the parameters. When the parameters managing these offsets are changed, the method must be called again to retrieve a new offset frame.

Specified by:

getOffsetToInertial in interface Observer

Parameters:

inertial - inertial frame to transform to

date - date of the transform

clockOffsetAlreadyApplied - if true, the specified date is as read by the ground station clock (i.e. clock offset not compensated), if false, the specified date was already compensated and is a physical absolute date

Returns:

transform between offset frame and inertial frame, at real measurement date (i.e. with clock, Earth and station offsets applied)

getOffsetToInertial

public FieldTransform<Gradient> getOffsetToInertial(Frame inertial,
 FieldAbsoluteDate<Gradient> offsetCompensatedDate,
 int freeParameters,
 Map<String,Integer> indices)

Get the transform between offset frame and inertial frame with derivatives.

As the East and North vectors are not well defined at pole, the derivatives of these two vectors diverge to infinity as we get closer to the pole. So this method should not be used for stations less than 0.0001 degree from either poles.

Specified by:

getOffsetToInertial in interface Observer

Parameters:

inertial - inertial frame to transform to

offsetCompensatedDate - date of the transform, clock offset and its derivatives already compensated

freeParameters - total number of free parameters in the gradient

indices - indices of the estimated parameters in derivatives computations, must be driver span name in map, not driver name or will not give right results (see ParameterDriver.getValue(int, Map))

Returns:

transform between offset frame and inertial frame, at specified date