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/****************************************************************************
Xplanet 0.94 - render an image of a planet into an X window
Copyright (C) 2002 Hari Nair <hari@alumni.caltech.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
****************************************************************************/
#include <cstring>
#include <iostream>
using namespace std;
#include <sys/time.h>
#include "util.h"
#include "Satellite.h"
using namespace sgp4sdp4;
Satellite::Satellite(char tle_lines[3][80])
{
good = (Get_Next_Tle_Set(tle_lines, &tle) == 1);
memcpy(tle_entry, tle_lines, 240);
}
Satellite::~Satellite()
{
}
int
Satellite::getID() const
{
return(tle.catnr);
}
const char * const
Satellite::getName()
{
return(tle.sat_name);
}
bool
Satellite::isGoodData() const
{
return(good);
}
void
Satellite::loadTLE()
{
Get_Next_Tle_Set(tle_entry, &tle);
ClearFlag(ALL_FLAGS);
select_ephemeris(&tle); // SGP4 or SDP4 depending on period
}
void
Satellite::getSpherical(const time_t tv_sec, double &lat, double &lon,
double &alt)
{
double jul_utc = julian(gmtime(&tv_sec)->tm_year + 1900,
gmtime(&tv_sec)->tm_mon + 1,
gmtime(&tv_sec)->tm_mday,
gmtime(&tv_sec)->tm_hour,
gmtime(&tv_sec)->tm_min,
gmtime(&tv_sec)->tm_sec);
double year, day;
/* Modification to support Y2K */
/* Valid 1957 through 2056 */
day = modf(tle.epoch*1E-3, &year)*1E3;
if( year < 57 )
year = year + 2000;
else
year = year + 1900;
/* End modification */
double jul_epoch = julian((int) year,1,0,0,0,0);
jul_epoch += day;
/* Zero vector for initializations */
vector_t zero_vector = {0,0,0,0};
vector_t pos = zero_vector;
vector_t vel = zero_vector;
double tsince = (jul_utc - jul_epoch) * xmnpda;
if( isFlagSet(DEEP_SPACE_EPHEM_FLAG) )
SDP4(tsince, &tle, &pos, &vel);
else
SGP4(tsince, &tle, &pos, &vel);
/* Scale position and velocity vectors to km and km/sec */
Convert_Sat_State( &pos, &vel );
/* Satellite's predicted geodetic position */
geodetic_t sat_geodetic;
/** All angles in rads. Distance in km. Velocity in km/s **/
/* Calculate satellite Lat North, Lon East and Alt. */
Calculate_LatLonAlt(jul_utc, &pos, &sat_geodetic);
lat = sat_geodetic.lat;
lon = sat_geodetic.lon;
alt = sat_geodetic.alt;
#if 0
cout << "BEGIN getSpherical()\n";
cout << getName() << endl;
cout << "day = " << day << "\tyear = " << year << endl;
cout << "tsince = " << tsince << endl;
cout << pos.x << '\t' << pos.y << '\t' << pos.z << endl;
cout << vel.x << '\t' << vel.y << '\t' << vel.z << endl;
cout << lat/deg_to_rad << '\t' << lon/deg_to_rad << '\t'
<< alt << endl;
cout << "END getSpherical()\n\n";
#endif
}
void
Satellite::printTLE() const
{
cout << "epoch = " << tle.epoch << endl;
cout << "xndt2o = " << tle.xndt2o << endl;
cout << "xndd6o = " << tle.xndd6o << endl;
cout << "bstar = " << tle.bstar << endl;
cout << "xincl = " << tle.xincl << endl;
cout << "xnodeo = " << tle.xnodeo << endl;
cout << "eo = " << tle.eo << endl;
cout << "omegao = " << tle.omegao << endl;
cout << "xmo = " << tle.xmo << endl;
cout << "xno = " << tle.xno << endl;
cout << "catnr = " << tle.catnr << endl;
cout << "elset = " << tle.elset << endl;
cout << "revnum = " << tle.revnum << endl;
cout << "name = " << tle.sat_name << endl;
cout << "idesg = " << tle.idesg << endl;
cout << endl;
}
bool
Satellite::operator == (const Satellite &sat) const
{
return(tle.catnr == sat.tle.catnr);
}
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