PolarSatPosition Class Reference

#include <satposition.h>

Inheritance diagram for PolarSatPosition:

[legend]Collaboration diagram for PolarSatPosition:

[legend]List of all members.

Public Member Functions
	PolarSatPosition (double=1000, double=90, double=0, double=0, double=0)
virtual coordinate	coord ()
void	set (double Altitude, double Lon, double Alpha, double inclination=90)
bool	isascending ()
PolarSatPosition *	next ()
int	plane ()
int	type ()
double	period ()
Node *	node ()
Static Public Attributes
double	time_advance_ = 0
Protected Member Functions
int	command (int argc, const char *const *argv)
Protected Attributes
PolarSatPosition *	next_
int	plane_
double	inclination_
coordinate	initial_
double	period_
int	type_
Node *	node_

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Constructor & Destructor Documentation

PolarSatPosition::PolarSatPosition (  double  = 1000, double  = 90, double  = 0, double  = 0, double  = 0 )

Definition at line 172 of file satposition.cc. References plane_, POSITION_SAT_POLAR, set(), and SatPosition::type_. : next_(0), plane_(0) { set(altitude, Lon, Alpha, Inc); bind("plane_", &plane_); if (Plane) plane_ = int(Plane); type_ = POSITION_SAT_POLAR; }

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Member Function Documentation

int PolarSatPosition::command (  int  argc, const char *const *  argv )  [protected]

Reimplemented from SatPosition. Definition at line 295 of file satposition.cc. References SatPosition::command(), and next_. { Tcl& tcl = Tcl::instance(); if (argc == 2) { } if (argc == 3) { if (strcmp(argv[1], "set_next") == 0) { next_ = (PolarSatPosition *) TclObject::lookup(argv[2]); if (next_ == 0) { tcl.resultf("no such object %s", argv[2]); return (TCL_ERROR); } return (TCL_OK); } } return (SatPosition::command(argc, argv)); }

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coordinate PolarSatPosition::coord (   )  [virtual]

Implements SatPosition. Definition at line 238 of file satposition.cc. References inclination_, SatPosition::initial_, NOW, SatPosition::period_, coordinate::phi, PI, coordinate::r, coordinate::theta, and SatPosition::time_advance_. Referenced by SatLinkHandoffMgr::handoff(), and TermLinkHandoffMgr::handoff(). { coordinate current; double partial; // fraction of orbit period completed partial = (fmod(NOW + time_advance_, period_)/period_) * 2*PI; //rad double theta_cur, phi_cur, theta_new, phi_new; // Compute current orbit-centric coordinates: // theta_cur adds effects of time (orbital rotation) to initial_.theta theta_cur = fmod(initial_.theta + partial, 2*PI); phi_cur = initial_.phi; // Reminder: theta_cur and phi_cur are temporal translations of // initial parameters and are NOT true spherical coordinates. // // Now generate actual spherical coordinates, // with 0 < theta_new < PI and 0 < phi_new < 360 if (inclination_ < PI) { // asin returns value between -PI/2 and PI/2, so // theta_new guaranteed to be between 0 and PI theta_new = PI/2 - asin(sin(inclination_) * sin(theta_cur)); // if theta_new is between PI/2 and 3*PI/2, must correct // for return value of atan() if (theta_cur > PI/2 && theta_cur < 3*PI/2) phi_new = atan(cos(inclination_) * tan(theta_cur)) + phi_cur + PI; else phi_new = atan(cos(inclination_) * tan(theta_cur)) + phi_cur; phi_new = fmod(phi_new + 2*PI, 2*PI); } else printf("ERROR: inclination_ > PI\n"); current.r = initial_.r; current.theta = theta_new; current.phi = phi_new; return current; }

bool PolarSatPosition::isascending (   )

Definition at line 284 of file satposition.cc. References SatPosition::initial_, NOW, SatPosition::period_, PI, coordinate::theta, and SatPosition::time_advance_. { double partial = (fmod(NOW + time_advance_, period_)/period_) * 2*PI; //rad double theta_cur = fmod(initial_.theta + partial, 2*PI); if ((theta_cur > PI/2)&&(theta_cur < 3*PI/2)) { return 0; } else { return 1; } }

PolarSatPosition* PolarSatPosition::next (   )  [inline]

Definition at line 82 of file satposition.h. References next_. Referenced by SatLinkHandoffMgr::handoff(), and TermLinkHandoffMgr::handoff(). { return next_; }

Node* SatPosition::node (  void   )  [inline, inherited]

Definition at line 62 of file satposition.h. References SatPosition::node_. Referenced by SatLinkHandoffMgr::handoff(), and TermLinkHandoffMgr::handoff(). { return node_; }

double SatPosition::period (   )  [inline, inherited]

Definition at line 61 of file satposition.h. References SatPosition::period_. { return period_; }

int PolarSatPosition::plane (   )  [inline]

Definition at line 83 of file satposition.h. References plane_. Referenced by SatNode::dumpSats(), and SatLinkHandoffMgr::handoff(). { return plane_; }

void PolarSatPosition::set (  double  Altitude, double  Lon, double  Alpha, double  inclination = 90 )

Definition at line 193 of file satposition.cc. References DEG_TO_RAD, EARTH_RADIUS, inclination_, SatPosition::initial_, MU, SatPosition::period_, coordinate::phi, PI, coordinate::r, and coordinate::theta. Referenced by PolarSatPosition(). { if (Altitude < 0) { fprintf(stderr, "PolarSatPosition: altitude out of \ bounds: %f\n", Altitude); exit(1); } initial_.r = Altitude + EARTH_RADIUS; // Altitude in km above the earth if (Alpha < 0 || Alpha >= 360) { fprintf(stderr, "PolarSatPosition: alpha out of bounds: %f\n", Alpha); exit(1); } initial_.theta = DEG_TO_RAD(Alpha); if (Lon < -180 || Lon > 180) { fprintf(stderr, "PolarSatPosition: lon out of bounds: %f\n", Lon); exit(1); } if (Lon < 0) initial_.phi = DEG_TO_RAD(360 + Lon); else initial_.phi = DEG_TO_RAD(Lon); if (Incl < 0 || Incl > 180) { // retrograde orbits = (90 < Inclination < 180) fprintf(stderr, "PolarSatPosition: inclination out of \ bounds: %f\n", Incl); exit(1); } inclination_ = DEG_TO_RAD(Incl); // XXX: can't use "num = pow(initial_.r,3)" here because of linux lib double num = initial_.r * initial_.r * initial_.r; period_ = 2 * PI * sqrt(num/MU); // seconds }

int SatPosition::type (   )  [inline, inherited]

Definition at line 60 of file satposition.h. References SatPosition::type_. Referenced by SatNode::dumpSats(), and TermLinkHandoffMgr::handoff(). { return type_; }

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Member Data Documentation

double PolarSatPosition::inclination_ [protected]

Definition at line 89 of file satposition.h. Referenced by coord(), and set().

coordinate SatPosition::initial_ [protected, inherited]

Definition at line 69 of file satposition.h. Referenced by GeoSatPosition::coord(), coord(), TermSatPosition::coord(), GeoSatPosition::GeoSatPosition(), isascending(), GeoSatPosition::set(), set(), TermSatPosition::set(), and TermSatPosition::TermSatPosition().

PolarSatPosition* PolarSatPosition::next_ [protected]

Definition at line 87 of file satposition.h. Referenced by command(), and next().

Node* SatPosition::node_ [protected, inherited]

Definition at line 72 of file satposition.h. Referenced by SatPosition::command(), and SatPosition::node().

double SatPosition::period_ [protected, inherited]

Definition at line 70 of file satposition.h. Referenced by GeoSatPosition::coord(), coord(), TermSatPosition::coord(), GeoSatPosition::GeoSatPosition(), isascending(), SatPosition::period(), set(), and TermSatPosition::TermSatPosition().

int PolarSatPosition::plane_ [protected]

Definition at line 88 of file satposition.h. Referenced by plane(), and PolarSatPosition().

double SatPosition::time_advance_ = 0 [static, inherited]

Definition at line 96 of file satposition.cc. Referenced by GeoSatPosition::coord(), coord(), TermSatPosition::coord(), SatGeometry::get_longitude(), isascending(), and SatPosition::SatPosition().

int SatPosition::type_ [protected, inherited]

Definition at line 71 of file satposition.h. Referenced by GeoSatPosition::GeoSatPosition(), PolarSatPosition(), TermSatPosition::TermSatPosition(), and SatPosition::type().

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

• satposition.h
• satposition.cc

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