Package org.orekit.gnss.attitude

Class GPSBlockIIA

java.lang.Object
org.orekit.gnss.attitude.GPSBlockIIA
All Implemented Interfaces:
AttitudeProvider, AttitudeRotationModel, GNSSAttitudeProvider, EventDetectorsProvider, ParameterDriversProvider
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 Details

    • DEFAULT_YAW_BIAS

      public static final double DEFAULT_YAW_BIAS
      Default yaw bias (rad).

  • Constructor Details

    • GPSBlockIIA

      public GPSBlockIIA(double yawRate, double yawBias, AbsoluteDate validityStart, AbsoluteDate validityEnd, ExtendedPositionProvider 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 Details

    • 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 CalculusFieldElement<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 on the specified date and position-velocity state

    • getAttitude

      public <T extends CalculusFieldElement<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 on the specified date and position-velocity state

    • getSun

      protected ExtendedPositionProvider getSun()
      Get provider for Sun position.
      Returns:
      provider for Sun position
      Since:
      12.0

    • getInertialFrame

      protected Frame getInertialFrame()
      Get inertial frame where velocity are computed.
      Returns:
      inertial frame where velocity are computed