SolarRadiationPressure Class Reference
[GeoDynamics]

#include <SolarRadiationPressure.hpp>

Inheritance diagram for SolarRadiationPressure:

[legend]Collaboration diagram for SolarRadiationPressure:

[legend]List of all members.

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Detailed Description

This class provides a generic model for the influence of solar radiation pressure on a satellite.

Definition at line 48 of file SolarRadiationPressure.hpp.

Public Types
enum	ShadowModel { SM_CYLINDRICAL, SM_CONICAL }
Public Member Functions
	SolarRadiationPressure ()
	Default constructor.
virtual	~SolarRadiationPressure ()
	Default destructor.
double	getShadowFunction (Vector< double > r, Vector< double > r_Sun, Vector< double > r_Moon, SolarRadiationPressure::ShadowModel sm=SM_CONICAL)
	Determines if the satellite is in sunlight or shadow.
virtual void	doCompute (UTCTime t, EarthBody &bRef, Spacecraft &sc)
	this is the real one to do computation
virtual std::string	modelName () const
	Return force model name.
virtual int	forceIndex () const
	return the force model index
Vector< double >	accelSRP (Vector< double > r, Vector< double > r_Sun)
	Compute the acceleration due to a solar radiation pressure.
double	partial_illumination (Vector< double > r, Vector< double > r_Sun)
	Determines if the satellite is in sunlight or shadow based on simple cylindrical shadow model.
Protected Attributes
double	crossArea
	Cross sectional (reflective) area [m^2].
double	srpArea
double	dryMass
	Mass [kg] of the satellite.
double	reflectCoeff
	Satellite coefficient of reflectivity.
Vector< double >	dadcr
	Object hold da/dCr.

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Member Enumeration Documentation

enum ShadowModel

Enumeration values: SM_CYLINDRICAL  SM_CONICAL  Definition at line 51 of file SolarRadiationPressure.hpp.

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Constructor & Destructor Documentation

SolarRadiationPressure (   )  [inline]

Default constructor. Definition at line 59 of file SolarRadiationPressure.hpp.

virtual ~SolarRadiationPressure (   )  [inline, virtual]

Default destructor. Definition at line 62 of file SolarRadiationPressure.hpp.

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Member Function Documentation

Vector< double > accelSRP (  Vector< double >  r, Vector< double >  r_Sun )

Compute the acceleration due to a solar radiation pressure. Parameters: r  ECI position vector [m]. r_Sun  ECI position vector of Sun in m. Returns: Acceleration due to solar radiation pressure in m/s^2. Definition at line 190 of file SolarRadiationPressure.cpp. References SolarRadiationPressure::crossArea, gpstk::norm(), and SolarRadiationPressure::reflectCoeff. Referenced by SolarRadiationPressure::doCompute().

void doCompute (  UTCTime  utc, EarthBody &  rb, Spacecraft &  sc )  [virtual]

this is the real one to do computation Reimplemented from ForceModel. Definition at line 253 of file SolarRadiationPressure.cpp. References SolarRadiationPressure::accelSRP(), UTCTime::asTDB(), SolarRadiationPressure::crossArea, ForceModel::da_dcr, ForceModel::da_dr, SolarRadiationPressure::dadcr, SolarRadiationPressure::dryMass, Spacecraft::getDragArea(), Spacecraft::getDryMass(), Spacecraft::getReflectCoeff(), SolarRadiationPressure::getShadowFunction(), gpstk::norm(), Spacecraft::R(), SolarRadiationPressure::reflectCoeff, Vector::resize(), and Matrix::resize().

virtual int forceIndex (   )  const [inline, virtual]

return the force model index Reimplemented from ForceModel. Definition at line 85 of file SolarRadiationPressure.hpp.

double getShadowFunction (  Vector< double >  r, Vector< double >  r_Sun, Vector< double >  r_Moon, SolarRadiationPressure::ShadowModel  sm = SM_CONICAL )

Determines if the satellite is in sunlight or shadow. Taken from Montenbruck and Gill p. 80-83 Parameters: r  ECI position vector of spacecraft [m]. r_Sun  Sun position vector (geocentric) [m]. r_Moon  Moon position vector (geocentric) [m]. Returns: 0.0 if in shadow, 1.0 if in sunlight, 0 to 1.0 if in partial shadow Definition at line 46 of file SolarRadiationPressure.cpp. References gpstk::acos(), gpstk::asin(), gpstk::dot(), GPSTK_THROW, gpstk::norm(), and gpstk::sqrt(). Referenced by SolarRadiationPressure::doCompute().

virtual std::string modelName (   )  const [inline, virtual]

Return force model name. Reimplemented from ForceModel. Definition at line 81 of file SolarRadiationPressure.hpp.

double partial_illumination (  Vector< double >  r, Vector< double >  r_Sun )

Determines if the satellite is in sunlight or shadow based on simple cylindrical shadow model. Taken from Montenbruck and Gill p. 80-83 Parameters: r  ECI position vector of spacecraft [m]. r_Sun  Sun position vector (geocentric) [m]. Returns: 0.0 if in shadow, 1.0 if in sunlight, 0 to 1.0 if in partial shadow Definition at line 219 of file SolarRadiationPressure.cpp. References gpstk::acos(), gpstk::asin(), gpstk::dot(), gpstk::norm(), and gpstk::sqrt().

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Member Data Documentation

double crossArea [protected]

Cross sectional (reflective) area [m^2]. Definition at line 110 of file SolarRadiationPressure.hpp. Referenced by SolarRadiationPressure::accelSRP(), and SolarRadiationPressure::doCompute().

Vector<double> dadcr [protected]

Object hold da/dCr. Definition at line 120 of file SolarRadiationPressure.hpp. Referenced by SolarRadiationPressure::doCompute().

double dryMass [protected]

Mass [kg] of the satellite. Definition at line 114 of file SolarRadiationPressure.hpp. Referenced by SolarRadiationPressure::doCompute().

double reflectCoeff [protected]

Satellite coefficient of reflectivity. Definition at line 117 of file SolarRadiationPressure.hpp. Referenced by SolarRadiationPressure::accelSRP(), and SolarRadiationPressure::doCompute().

double srpArea [protected]

Definition at line 111 of file SolarRadiationPressure.hpp.

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The documentation for this class was generated from the following files:

• SolarRadiationPressure.hpp
• SolarRadiationPressure.cpp

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