Package org.orekit.gnss.attitude

Class GPSBlockIIA

java.lang.Object

org.orekit.gnss.attitude.AbstractGNSSAttitudeProvider

org.orekit.gnss.attitude.GPSBlockIIA

All Implemented Interfaces:

Serializable, AttitudeProvider, GNSSAttitudeProvider

public class GPSBlockIIA
extends AbstractGNSSAttitudeProvider

Attitude providers for GPS block IIR 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

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static double	DEFAULT_YAW_BIAS	Default yaw bias (rad).
static double[]	DEFAULT_YAW_RATES	Default yaw rates for all spacecrafts in radians per seconds (indexed by prnNumber, hence entry 0 is unused).

Constructor Summary

Constructors

Constructor	Description
GPSBlockIIA(double yawRate, double yawBias, AbsoluteDate validityStart, AbsoluteDate validityEnd, ExtendedPVCoordinatesProvider sun, Frame inertialFrame)	Simple constructor.
GPSBlockIIA(double yawRate, double yawBias, AbsoluteDate validityStart, AbsoluteDate validityEnd, ExtendedPVCoordinatesProvider sun, Frame inertialFrame, int prnNumber)	Deprecated. as of 9.3 replaced by GPSBlockIIA(double, double, AbsoluteDate, AbsoluteDate, ExtendedPVCoordinatesProvider, Frame)

Method Summary

Modifier and Type	Method	Description
protected TimeStampedAngularCoordinates	correctedYaw(org.orekit.gnss.attitude.GNSSAttitudeContext context)	Select the /** Compute GNSS attitude with midnight/noon yaw turn correction.
protected <T extends org.hipparchus.RealFieldElement<T>> TimeStampedFieldAngularCoordinates<T>	correctedYaw(org.orekit.gnss.attitude.GNSSFieldAttitudeContext<T> context)	Compute GNSS attitude with midnight/noon yaw turn correction.

Methods inherited from class org.orekit.gnss.attitude.AbstractGNSSAttitudeProvider

getAttitude, getAttitude, validityEnd, validityStart

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_YAW_RATES

public static final double[] DEFAULT_YAW_RATES

Default yaw rates for all spacecrafts in radians per seconds (indexed by prnNumber, hence entry 0 is unused).

DEFAULT_YAW_BIAS

public static final double DEFAULT_YAW_BIAS

Default yaw bias (rad).

Constructor Detail

GPSBlockIIA

@Deprecated
public GPSBlockIIA(double yawRate,
                   double yawBias,
                   AbsoluteDate validityStart,
                   AbsoluteDate validityEnd,
                   ExtendedPVCoordinatesProvider sun,
                   Frame inertialFrame,
                   int prnNumber)

Deprecated. as of 9.3 replaced by GPSBlockIIA(double, double, AbsoluteDate, AbsoluteDate, ExtendedPVCoordinatesProvider, Frame)

Simple constructor.

Parameters:

yawRate - yaw rate to use in radians per seconds (typically DEFAULT_YAW_RATES[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

prnNumber - number within the GPS constellation (between 1 and 32)

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 DEFAULT_YAW_RATES[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

correctedYaw

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

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

Specified by:

correctedYaw in class AbstractGNSSAttitudeProvider

Parameters:

context - context data for attitude computation

Returns:

corrected yaw, using inertial frame as the reference

correctedYaw

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

Compute GNSS attitude with midnight/noon yaw turn correction.

Specified by:

correctedYaw in class AbstractGNSSAttitudeProvider

Type Parameters:

T - type of the field elements

Parameters:

context - context data for attitude computation

Returns:

corrected yaw, using inertial frame as the reference