org.orekit.gnss.attitude

Class GPSBlockIIA

java.lang.Object

org.orekit.gnss.attitude.GPSBlockIIA

All Implemented Interfaces:

AttitudeProvider, GNSSAttitudeProvider

public class GPSBlockIIA
extends Object

Attitude providers for GPS block IIA navigation satellites.

This class is based on the May 2017 version of J. Kouba eclips.f subroutine available at IGS Analysis Center Coordinator site. The eclips.f code itself is not used ; its hard-coded data are used and its low level models are used, but the structure of the code and the API have been completely rewritten.

Since:

9.2

Author:

J. Kouba original fortran routine, Luc Maisonobe Java translation

Field Summary

Fields

Modifier and Type	Field and Description
static double	DEFAULT_YAW_BIAS Default yaw bias (rad).

Constructor Summary

Constructors

Constructor and Description
GPSBlockIIA(double yawRate, double yawBias, AbsoluteDate validityStart, AbsoluteDate validityEnd, ExtendedPVCoordinatesProvider sun, Frame inertialFrame) Simple constructor.

Method Summary

Modifier and Type	Method and Description
protected TimeStampedAngularCoordinates	correctedYaw(org.orekit.gnss.attitude.GNSSAttitudeContext context) Select the /** Compute GNSS attitude with midnight/noon yaw turn correction.
protected <T extends RealFieldElement<T>> TimeStampedFieldAngularCoordinates<T>	correctedYaw(org.orekit.gnss.attitude.GNSSFieldAttitudeContext<T> context) Compute GNSS attitude with midnight/noon yaw turn correction.
<T extends RealFieldElement<T>> FieldAttitude<T>	getAttitude(FieldPVCoordinatesProvider<T> pvProv, FieldAbsoluteDate<T> date, Frame frame) Compute the attitude corresponding to an orbital state.
Attitude	getAttitude(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the attitude corresponding to an orbital state.
static double	getDefaultYawRate(int prnNumber) Get the default yaw rate for a satellite.
AbsoluteDate	validityEnd() Get end of validity for this provider.
AbsoluteDate	validityStart() Get start of validity for this provider.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_YAW_BIAS

public static final double DEFAULT_YAW_BIAS

Default yaw bias (rad).

Constructor Detail

GPSBlockIIA

public GPSBlockIIA(double yawRate,
                   double yawBias,
                   AbsoluteDate validityStart,
                   AbsoluteDate validityEnd,
                   ExtendedPVCoordinatesProvider sun,
                   Frame inertialFrame)

Simple constructor.

Parameters:

yawRate - yaw rate to use in radians per seconds (typically GPSBlockIIA.getDefaultYawRate(prnNumber))

yawBias - yaw bias to use (rad) (typicall DEFAULT_YAW_BIAS)

validityStart - start of validity for this provider

validityEnd - end of validity for this provider

sun - provider for Sun position

inertialFrame - inertial frame where velocity are computed

Since:

9.3

Method Detail

getDefaultYawRate

public static double getDefaultYawRate(int prnNumber)

Get the default yaw rate for a satellite.

Parameters:

prnNumber - satellite PRN

Returns:

default yaw rate for the specified satellite

Since:

10.0

correctedYaw

protected TimeStampedAngularCoordinates correctedYaw(org.orekit.gnss.attitude.GNSSAttitudeContext context)

Select the /** Compute GNSS attitude with midnight/noon yaw turn correction.

Parameters:

context - context data for attitude computation

Returns:

corrected yaw, using inertial frame as the reference

correctedYaw

protected <T extends RealFieldElement<T>> TimeStampedFieldAngularCoordinates<T> correctedYaw(org.orekit.gnss.attitude.GNSSFieldAttitudeContext<T> context)

Compute GNSS attitude with midnight/noon yaw turn correction.

Type Parameters:

T - type of the field elements

Parameters:

context - context data for attitude computation

Returns:

corrected yaw, using inertial frame as the reference

validityStart

public AbsoluteDate validityStart()

Get start of validity for this provider.

Specified by:

validityStart in interface GNSSAttitudeProvider

Returns:

start of validity for this provider

validityEnd

public AbsoluteDate validityEnd()

Get end of validity for this provider.

Specified by:

validityEnd in interface GNSSAttitudeProvider

Returns:

end of validity for this provider

getAttitude

public Attitude getAttitude(PVCoordinatesProvider pvProv,
                            AbsoluteDate date,
                            Frame frame)

Compute the attitude corresponding to an orbital state.

Specified by:

getAttitude in interface AttitudeProvider

Parameters:

pvProv - local position-velocity provider around current date

date - current date

frame - reference frame from which attitude is computed

Returns:

attitude attitude on the specified date and position-velocity state

getAttitude

public <T extends RealFieldElement<T>> FieldAttitude<T> getAttitude(FieldPVCoordinatesProvider<T> pvProv,
                                                                    FieldAbsoluteDate<T> date,
                                                                    Frame frame)

Compute the attitude corresponding to an orbital state.

Specified by:

getAttitude in interface AttitudeProvider

Type Parameters:

T - type of the field elements

Parameters:

pvProv - local position-velocity provider around current date

date - current date

frame - reference frame from which attitude is computed

Returns:

attitude attitude on the specified date and position-velocity state