SatGeometry Class Reference

#include <satgeometry.h>

Inheritance diagram for SatGeometry:

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[legend]List of all members.

Public Member Functions
	SatGeometry ()
Static Public Member Functions
double	distance (coordinate, coordinate)
void	spherical_to_cartesian (double, double, double, double &, double &, double &)
double	propdelay (coordinate, coordinate)
double	get_latitude (coordinate)
double	get_longitude (coordinate)
double	get_radius (coordinate a)
double	get_altitude (coordinate)
double	check_elevation (coordinate, coordinate, double)
int	are_satellites_mutually_visible (coordinate, coordinate)
Protected Member Functions
int	command ()

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Constructor & Destructor Documentation

SatGeometry::SatGeometry (   )  [inline]

Definition at line 73 of file satgeometry.h. { printf("Started\n");}

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Member Function Documentation

int SatGeometry::are_satellites_mutually_visible (  coordinate  , coordinate  )  [static]

Definition at line 144 of file satgeometry.cc. References ATMOS_MARGIN, distance(), EARTH_RADIUS, FALSE, get_radius(), and TRUE. Referenced by SatLinkHandoffMgr::handoff(). { // if we drop a perpendicular from the ISL to the Earth's surface, // we have a right triangle. The atmospheric margin is the minimum // ISL grazing altitude. double c, d, min_radius, grazing_radius; double radius = get_radius(first); // could just use first.r here. double distance_ = distance(first, second); c = radius * radius; d = (distance_/2) * (distance_/2); grazing_radius = (EARTH_RADIUS + ATMOS_MARGIN); min_radius = sqrt(c - d); if (min_radius >= grazing_radius) { return TRUE; } else { return FALSE; } }

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double SatGeometry::check_elevation (  coordinate  , coordinate  , double  )  [static]

Definition at line 117 of file satgeometry.cc. References distance(), EARTH_RADIUS, and coordinate::r. Referenced by TermLinkHandoffMgr::handoff(). { double S = satellite.r; // satellite radius double S_2 = satellite.r * satellite.r; // satellite radius^2 double E = EARTH_RADIUS; double E_2 = E * E; double d, theta, alpha; d = distance(satellite, terminal); if (d < sqrt(S_2 - E_2)) { // elevation angle > 0 theta = acos((E_2+S_2-(d*d))/(2*E*S)); alpha = acos(sin(theta) * S/d); return ( (alpha > elev_mask_) ? alpha : 0); } else return 0; }

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int SatGeometry::command (   )  [inline, protected]

Definition at line 87 of file satgeometry.h. { return 0; }

double SatGeometry::distance (  coordinate  , coordinate  )  [static]

Definition at line 56 of file satgeometry.cc. References DISTANCE, coordinate::phi, coordinate::r, BaseTrace::round(), spherical_to_cartesian(), and coordinate::theta. Referenced by are_satellites_mutually_visible(), check_elevation(), SatLinkHandoffMgr::handoff(), and propdelay(). { double a_x, a_y, a_z, b_x, b_y, b_z; // cartesian spherical_to_cartesian(a.r, a.theta, a.phi, a_x, a_y, a_z); spherical_to_cartesian(b.r, b.theta, b.phi, b_x, b_y, b_z); return (BaseTrace::round(DISTANCE(a_x, a_y, a_z, b_x, b_y, b_z), 1.0E+8)); }

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double SatGeometry::get_altitude (  coordinate   )  [static]

Definition at line 81 of file satgeometry.cc. References EARTH_RADIUS, and coordinate::r. { return (a.r - EARTH_RADIUS); }

double SatGeometry::get_latitude (  coordinate   )  [static]

Definition at line 87 of file satgeometry.cc. References PI, and coordinate::theta. Referenced by SatNode::dumpSats(), SatTrace::format(), and SatLinkHandoffMgr::handoff(). { return (PI/2 - a.theta); }

double SatGeometry::get_longitude (  coordinate   )  [static]

Definition at line 96 of file satgeometry.cc. References EARTH_PERIOD, NOW, coordinate::phi, PI, and SatPosition::time_advance_. Referenced by SatNode::dumpSats(), SatTrace::format(), and SatLinkHandoffMgr::handoff(). { double period = EARTH_PERIOD; // period of earth in seconds // adjust longitude so that it is earth-centric (i.e., account // for earth rotating beneath). double earth_longitude = fmod((coord_.phi - (fmod(NOW + SatPosition::time_advance_,period)/period) * 2*PI), 2*PI); // Bring earth_longitude to be within (-PI, PI) if (earth_longitude < (-1*PI)) earth_longitude = 2*PI + earth_longitude; if (earth_longitude > PI) earth_longitude = (-(2*PI - earth_longitude)); if (fabs(earth_longitude) < 0.0001) return 0; // To avoid trace output of "-0.00" else return (earth_longitude); }

double SatGeometry::get_radius (  coordinate  a  )  [inline, static]

Definition at line 80 of file satgeometry.h. References coordinate::r. Referenced by are_satellites_mutually_visible(). { return a.r; }

double SatGeometry::propdelay (  coordinate  , coordinate  )  [static]

Definition at line 75 of file satgeometry.cc. References distance(), LIGHT, and BaseTrace::round(). Referenced by SatChannel::get_pdelay(). { double delay = distance(a, b)/LIGHT; return (BaseTrace::round(delay, 1.0E+8)); }

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void SatGeometry::spherical_to_cartesian (  double  , double  , double  , double &  , double &  , double &  )  [static]

Definition at line 66 of file satgeometry.cc. Referenced by distance(). { X = R * sin(Theta) * cos (Phi); Y = R * sin(Theta) * sin (Phi); Z = R * cos(Theta); }

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

• satgeometry.h
• satgeometry.cc

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