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Orbit Class Reference

Calculates the position of a satellite in a low, circular orbit. The path is assumed to go to the east, with the rotation of the earth, as is the case for most satellite orbits. All angles are expressed in degrees. Longitude increases to the east. More...

#include <Orbit.h>

Inheritance diagram for Orbit:

List of all members.

Public Methods
	Orbit (double asclon = 0., double alt = 600., double inc = 28.5, double phs = 0., double apitch = 0., double ayaw = 0., double aroll = 0.)
	default constructor. More...
double	get_phase (double time) const
	phase of the orbit as a proportion of a single period.
std::pair<double,double>	coords (double time) const
	returns position as a pair using specified time. More...
virtual double	latitude (double time) const
	latitude as a function of time (in minutes). More...
virtual double	longitude (double time) const
	longitude as a function of time, taking into account the starting longitude and the eastward rotation of the earth. More...
virtual double	pitch (double time) const
	pitch of the spacecraft (rotation around E-W axis) zenith pointing is pitch == 0. More...
virtual double	yaw (double time) const
	yaw of the spacecraft (rotation around zenith) square to E-W and N-S axis represents yaw == 0. More...
virtual double	roll (double time) const
	roll of the spacecraft (rotation around N-S axis) zenith pointing is roll == 0. More...
virtual double	phase (double time) const
	phase of the orbit at a given time. More...
void	inclination ( double inc )
	set the inclination of the orbit. More...
void	ascendingLon ( double asc )
	set the longitude of the ascending node. More...
void	startphase ( double phi )
	set the phase of the orbit (in radians). More...
double	startphase () const
	inlined access methods. More...
double	period () const
double	inclination () const
double	altitude () const
double	ascendingLon () const
Protected Methods
virtual void	setlatitude ( double )
virtual void	setlongitude ( double )
virtual void	setpitch ( double )
virtual void	setyaw ( double )
virtual void	setroll ( double )
Private Attributes
double	m_ascendingLon
double	m_inclination
double	m_altitude
double	m_period
double	m_sini
double	m_cosi
double	m_startphase
Friends
class	GPS

Detailed Description

Constructor: The three arguments are 1. Longitude of the ascending node (where the orbit crosses the equator, moving northward) in degrees 2. Altitude in kilometers. Defaults to 600. 3. Orbital inclination in degrees. Defaults to 28.5.

Member functions: latitude(time) and longitude(time) give the position of the satellite (in degrees) when "time" minutes have elapsed since the ascending node passage. longitude is between 0 and 360. coords(time) returns the latitude and longitude as a pair<double,double>. period() returns the period of the orbit (in minutes). inclination(), altitude(), and ascendingLon() return the parameters used in the constructor, in case you forget.

There is no need for an explicit destructor, copy constructor, or assignment operator.

Definition at line 36 of file Orbit.h.

Constructor & Destructor Documentation

Orbit::Orbit ( double asclon = 0.,

double alt = 600.,

double inc = 28.5,

double phs = 0.,

double pitch = 0.,

double yaw = 0.,

double roll = 0. )

default constructor.

Definition at line 12 of file Orbit.cxx.

Member Function Documentation

double Orbit::altitude ( ) const [inline]

Definition at line 116 of file Orbit.h.

double Orbit::ascendingLon ( ) const [inline]

Definition at line 118 of file Orbit.h.

void Orbit::ascendingLon ( double asc )

set the longitude of the ascending node.

Definition at line 31 of file Orbit.cxx.
Referenced by GPS::ascendingLon(), and GPS::synch().

std::pair< double,double > Orbit::coords ( double time ) const

returns position as a pair using specified time.

Definition at line 75 of file Orbit.cxx.

double Orbit::get_phase ( double time ) const

phase of the orbit as a proportion of a single period.

double Orbit::inclination ( ) const [inline]

Definition at line 114 of file Orbit.h.
Referenced by Orbit().

void Orbit::inclination ( double inc )

set the inclination of the orbit.

Definition at line 24 of file Orbit.cxx.

double Orbit::latitude ( double time ) const [virtual]

latitude as a function of time (in minutes).

Definition at line 41 of file Orbit.cxx.
Referenced by coords(), and GPS::lat().

double Orbit::longitude ( double time ) const [virtual]

longitude as a function of time, taking into account the starting longitude and the eastward rotation of the earth.

Definition at line 46 of file Orbit.cxx.
Referenced by coords(), and GPS::lon().

double Orbit::period ( ) const [inline]

Definition at line 112 of file Orbit.h.
Referenced by phase(), and GPS::phase().

double Orbit::phase ( double time ) const [virtual]

phase of the orbit at a given time.

Definition at line 70 of file Orbit.cxx.
Referenced by GPS::phase(), and GPS::state().

double Orbit::pitch ( double time ) const [virtual]

pitch of the spacecraft (rotation around E-W axis) zenith pointing is pitch == 0.

Definition at line 58 of file Orbit.cxx.
Referenced by GPS::pitch().

double Orbit::roll ( double time ) const [virtual]

roll of the spacecraft (rotation around N-S axis) zenith pointing is roll == 0.

Definition at line 66 of file Orbit.cxx.
Referenced by GPS::roll().

void Orbit::setlatitude ( double l ) [inline, protected, virtual]

Reimplemented in StaticOrbit.
Definition at line 93 of file Orbit.h.
Referenced by GPS::lat(), and GPS::setState().

void Orbit::setlongitude ( double l ) [inline, protected, virtual]

Reimplemented in StaticOrbit.
Definition at line 94 of file Orbit.h.
Referenced by GPS::lon(), and GPS::setState().

void Orbit::setpitch ( double p ) [inline, protected, virtual]

Reimplemented in StaticOrbit.
Definition at line 95 of file Orbit.h.
Referenced by GPS::pitch(), and GPS::setState().

void Orbit::setroll ( double r ) [inline, protected, virtual]

Reimplemented in StaticOrbit.
Definition at line 97 of file Orbit.h.
Referenced by GPS::roll(), and GPS::setState().

void Orbit::setyaw ( double y ) [inline, protected, virtual]

Reimplemented in StaticOrbit.
Definition at line 96 of file Orbit.h.
Referenced by GPS::setState(), and GPS::yaw().

double Orbit::startphase ( ) const [inline]

inlined access methods.

Definition at line 120 of file Orbit.h.
Referenced by latitude(), longitude(), and phase().

void Orbit::startphase ( double phs )

set the phase of the orbit (in radians).

Definition at line 36 of file Orbit.cxx.
Referenced by GPS::phase().

double Orbit::yaw ( double time ) const [virtual]

yaw of the spacecraft (rotation around zenith) square to E-W and N-S axis represents yaw == 0.

Definition at line 62 of file Orbit.cxx.
Referenced by GPS::yaw().

Friends And Related Function Documentation

class GPS [friend]

Definition at line 100 of file Orbit.h.

Member Data Documentation

double Orbit::m_altitude [private]

Definition at line 105 of file Orbit.h.

double Orbit::m_ascendingLon [private]

Definition at line 103 of file Orbit.h.

double Orbit::m_cosi [private]

Definition at line 108 of file Orbit.h.

double Orbit::m_inclination [private]

Definition at line 104 of file Orbit.h.

double Orbit::m_period [private]

Definition at line 106 of file Orbit.h.

double Orbit::m_sini [private]

Definition at line 107 of file Orbit.h.

double Orbit::m_startphase [private]

Definition at line 109 of file Orbit.h.

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

Generated at Wed Nov 21 12:20:36 2001 by

Orbit Class Reference

Public Methods

Protected Methods

Private Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation