fr.cnes.sirius.patrius.orbits.pvcoordinates

Class GNSSPVCoordinates

java.lang.Object

fr.cnes.sirius.patrius.orbits.pvcoordinates.GNSSPVCoordinates

All Implemented Interfaces:

PVCoordinatesProvider, Serializable

public class GNSSPVCoordinates
extends Object
implements PVCoordinatesProvider

This class implements the PVCoordinatesProvider to compute position velocity of a GPS, Galileo or BeiDou constellation satellite from its almanac/broadcast model parameters.

Author:

fteilhard

See Also:

Serialized Form

Concurrency :

immutable

Constructor Summary

Constructors

Constructor and Description
GNSSPVCoordinates(GNSSParameters parameters, AbsoluteDate weekStartDate) Creates an instance of AlmanacPVCoordinates.

Method Summary

Modifier and Type	Method and Description
double	getClockCorrection(AbsoluteDate date) Compute the correction term for the offset of the satellite's transmission time of signal
Frame	getNativeFrame(AbsoluteDate date, Frame frame) Get the native frame, i.e.
PVCoordinates	getPVCoordinates(AbsoluteDate date, Frame frame) Geometric computation of the position to a date.
double	getRelativisticCorrection(double timek) Compute the relativistic correction term for the satellite time correction

Methods inherited from class java.lang.Object

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

Constructor Detail

GNSSPVCoordinates

public GNSSPVCoordinates(GNSSParameters parameters,
                         AbsoluteDate weekStartDate)

Creates an instance of AlmanacPVCoordinates.

Parameters:

parameters - Almanac parameters

weekStartDate - the date of the beginning of the week

Since:

3.1

Method Detail

getPVCoordinates

public PVCoordinates getPVCoordinates(AbsoluteDate date,
                                      Frame frame)
                               throws PatriusException

Geometric computation of the position to a date. Computes a finite difference between position at date minus step and position at date plus step. If Input frame is null, results are expressed in WGS84.

Specified by:

getPVCoordinates in interface PVCoordinatesProvider

Parameters:

date - Date to compute coordinates

frame - Results expression frame.

Returns:

position velocity coordinates at input date in frame

Throws:

PatriusException - if input frame is different from WGS84 and configuration has not been defined

getNativeFrame

public Frame getNativeFrame(AbsoluteDate date,
                            Frame frame)
                     throws PatriusException

Get the native frame, i.e. the raw frame in which PVCoordinates are expressed before transformation to user output frame. This native frame can be dependent on date and frame.

Specified by:

getNativeFrame in interface PVCoordinatesProvider

Parameters:

date - a date

frame - a frame

Returns:

the native frame

Throws:

PatriusException - thrown if native frame is undefined or unknown

getClockCorrection

public double getClockCorrection(AbsoluteDate date)

Compute the correction term for the offset of the satellite's transmission time of signal

Parameters:

date - Position's date

Returns:

the clock correction

getRelativisticCorrection

public double getRelativisticCorrection(double timek)

Compute the relativistic correction term for the satellite time correction

Parameters:

timek - time gap between the time of applicability (tref) and the time of the sought position

Returns:

the relativistic correction of the clock