int main( const int argc, const char **argv)
{
const char *tle_file_name = "ALL_TLE.TXT";
FILE *ifile = fopen( argv[1], "rb"), *tle_file;
FILE *stations;
char line1[100], line2[100], buff[90];
double search_radius = .2; /* default to .2-degree search */
double lon = 0., rho_sin_phi = 0., rho_cos_phi = 0.;
char curr_mpc_code[4];
int i, debug_level = 0, show_non_mpc_report_lines = 0;
char prev_obj[20];
double prev_jd = 0., prev_ra = 0., prev_dec = 0.;
if( argc == 1)
error_exit( -2);
if( !ifile)
{
printf( "Couldn't open input file %s\n", argv[1]);
exit( -1);
}
stations = fopen( "ObsCodes.html", "rb");
if( !stations) /* perhaps stored with truncated extension? */
stations = fopen( "ObsCodes.htm", "rb");
if( !stations) /* Or as a text file? */
stations = fopen( "stations.txt", "rb");
if( !stations)
{
printf( "Failed to find MPC station list 'ObsCodes.html'\n");
printf( "This can be downloaded at:\n\n");
printf( "http://www.minorplanetcenter.org/iau/lists/ObsCodes.html\n");
exit( -1);
}
curr_mpc_code[0] = curr_mpc_code[3] = '\0';
for( i = 1; i < argc; i++)
if( argv[i][0] == '-')
switch( argv[i][1])
{
case 'r':
search_radius = atof( argv[i] + 2);
break;
case 't':
tle_file_name = argv[i] + 2;
break;
break;
case 'd':
debug_level = atoi( argv[i] + 2);
break;
case 'a':
show_non_mpc_report_lines = 1;
break;
default:
printf( "Unrecognized command-line option '%s'\n", argv[i]);
exit( -2);
break;
}
tle_file = fopen( tle_file_name, "rb");
if( !tle_file)
{
printf( "Couldn't open TLE file %s\n", tle_file_name);
exit( -1);
}
*prev_obj = '\0';
while( fgets( buff, sizeof( buff), ifile))
{
double target_ra, target_dec, jd;
if( !get_mpc_data( buff, &jd, &target_ra, &target_dec))
{
char preceding_line[80], line0[100];
double observer_loc[3], observer_loc2[3];
printf( "\n%s", buff);
if( !memcmp( prev_obj, buff, 12) && fabs( jd - prev_jd) < .3)
{
double motion, posn_ang;
if( !compute_motion( jd - prev_jd,
(target_ra - prev_ra) * cos( (prev_dec + target_dec) / 2.),
(target_dec - prev_dec), &motion, &posn_ang))
printf( " Object motion is %.3lf'/sec at PA %.1lf\n",
motion, posn_ang);
}
memcpy( prev_obj, buff, 12);
prev_ra = target_ra;
prev_dec = target_dec;
prev_jd = jd;
if( memcmp( curr_mpc_code, buff + 77, 3))
{
char tbuff[100];
int got_it = 0;
memcpy( curr_mpc_code, buff + 77, 3);
fseek( stations, 0L, SEEK_SET);
while( !got_it && fgets( tbuff, sizeof( tbuff), stations))
got_it = !memcmp( tbuff, curr_mpc_code, 3);
if( got_it)
sscanf( tbuff + 3, "%lf %lf %lf",
&lon, &rho_cos_phi, &rho_sin_phi);
if( !got_it)
printf( "FAILED to find MPC code %s\n", curr_mpc_code);
}
if( debug_level)
printf( "lon = %.5lf rho cos phi = %.5lf rho sin phi = %.5lf\n",
lon, rho_cos_phi, rho_sin_phi);
observer_cartesian_coords( jd,
lon * PI / 180., rho_cos_phi, rho_sin_phi, observer_loc);
observer_cartesian_coords( jd + TIME_EPSILON,
lon * PI / 180., rho_cos_phi, rho_sin_phi, observer_loc2);
fseek( tle_file, 0L, SEEK_SET);
*line0 = '\0';
if( fgets( line1, sizeof( line1), tle_file))
while( fgets( line2, sizeof( line2), tle_file))
{
tle_t tle; /* Structure for two-line elements set for satellite */
if( parse_elements( line1, line2, &tle) >= 0)
{ /* hey! we got a TLE! */
int is_deep = select_ephemeris( &tle);
double sat_params[N_SAT_PARAMS], radius, d_ra, d_dec;
double ra, dec, dist_to_satellite, t_since;
double pos[3]; /* Satellite position vector */
double unused_delta2;
if( debug_level > 1)
printf( "%s", line1);
t_since = (jd - tle.epoch) * 1440.;
if( is_deep)
{
SDP4_init( sat_params, &tle);
SDP4( t_since, &tle, sat_params, pos, NULL);
}
else
{
SGP4_init( sat_params, &tle);
SGP4( t_since, &tle, sat_params, pos, NULL);
}
if( debug_level > 1)
printf( "%s", line2);
if( debug_level > 2)
printf( " %.5lf %.5lf %.5lf\n", pos[0], pos[1], pos[2]);
get_satellite_ra_dec_delta( observer_loc, pos,
&ra, &dec, &dist_to_satellite);
if( debug_level > 3)
printf( "RA: %.5lf dec: %.5lf\n", ra * 180. / PI,
dec * 180. / PI);
epoch_of_date_to_j2000( jd, &ra, &dec);
d_ra = (ra - target_ra + PI * 4.);
while( d_ra > PI)
d_ra -= PI + PI;
d_dec = dec - target_dec;
radius = sqrt( d_ra * d_ra + d_dec * d_dec) * 180. / PI;
if( radius < search_radius) /* good enough for us! */
{
double arcmin_per_sec, posn_ang;
/* Compute position one second later, so we */
/* can show speed/PA of motion: */
t_since += TIME_EPSILON * 1440.;
if( is_deep)
SDP4( t_since, &tle, sat_params, pos, NULL);
else
SGP4( t_since, &tle, sat_params, pos, NULL);
get_satellite_ra_dec_delta( observer_loc2, pos,
&d_ra, &d_dec, &unused_delta2);
epoch_of_date_to_j2000( jd, &d_ra, &d_dec);
d_ra -= ra;
d_dec -= dec;
while( d_ra > PI)
d_ra -= PI + PI;
while( d_ra < -PI)
d_ra += PI + PI;
/* Put RA into 0 to 2pi range: */
if( !compute_motion( TIME_EPSILON, d_ra * cos( dec), d_dec,
&arcmin_per_sec, &posn_ang))
{
line1[8] = line1[16] = '\0';
memcpy( line1 + 30, line1 + 11, 6);
line1[11] = '\0';
printf( " %s = %s%s-%s",
line1 + 2, (line1[9] >= '6' ? "19" : "20"),
line1 + 9, line1 + 30);
printf( " e=%.2lf; P=%.1lf min; i=%.1lf",
tle.eo,
2. * PI / tle.xno,
tle.xincl * 180. / PI);
if( strlen( line0) < 30) /* object name given... */
printf( ": %s\n", line0); /* not all TLEs do this */
else
printf( "\n");
printf( " delta=%8.1lf km; offset=%5.2lf degrees; motion %6.3lf'/sec at PA=%.1lf\n",
dist_to_satellite, radius, arcmin_per_sec,
posn_ang);
/* "Speed" is displayed in arcminutes/second,
or in degrees/minute */
}
}
}
strcpy( preceding_line, line1);
strcpy( line0, line1);
strcpy( line1, line2);
for( i = 0; line0[i] >= ' '; i++)
;
line0[i] = '\0'; /* remove trailing CR/LF */
}
}
else if( show_non_mpc_report_lines)
printf( "%s", buff);
}
fclose( tle_file);
fclose( stations);
fclose( ifile);
return( 0);
} /* End of main() */
int main( const int argc, const char **argv)
{
FILE *ifile = fopen( argv[1], "rb");
char line1[100], line2[100];
const char *intl_id = NULL;
double step_size = .1;
int i, n_steps = 100;
if( !ifile)
{
printf( "Couldn't open input file\n");
exit( -1);
}
for( i = 1; i < argc; i++)
if( argv[i][0] == '-')
switch( argv[i][1])
{
case 'i':
intl_id = argv[i] + 2;
break;
case 'n':
n_steps = atoi( argv[i] + 2);
break;
default:
printf( "Unrecognized option '%s'\n", argv[i]);
break;
}
*line1 = '\0';
sxpx_set_implementation_param( SXPX_DUNDEE_COMPLIANCE, 1);
while( fgets( line2, sizeof( line2), ifile))
{
tle_t tle; /* Pointer to two-line elements set for satellite */
int err_val;
if( (!intl_id || !memcmp( intl_id, line1 + 9, 6))
&& (err_val = parse_elements( line1, line2, &tle)) >= 0)
{ /* hey! we got a TLE! */
int is_deep = select_ephemeris( &tle);
double sat_params[N_SAT_PARAMS], observer_loc[3];
if( err_val)
printf( "WARNING: TLE parsing error %d\n", err_val);
for( i = 0; i < 3; i++)
observer_loc[i] = '\0';
if( is_deep)
SDP4_init( sat_params, &tle);
else
SGP4_init( sat_params, &tle);
for( i = 0; i < n_steps; i++)
{
double ra, dec, dist_to_satellite;
double pos[3]; /* Satellite position vector */
double t_since = (double)( i - n_steps / 2) * step_size;
double jd = tle.epoch + t_since;
t_since *= 1440.;
if( is_deep)
err_val = SDP4( t_since, &tle, sat_params, pos, NULL);
else
err_val = SGP4( t_since, &tle, sat_params, pos, NULL);
if( err_val)
printf( "Ephemeris error %d\n", err_val);
get_satellite_ra_dec_delta( observer_loc, pos,
&ra, &dec, &dist_to_satellite);
epoch_of_date_to_j2000( jd, &ra, &dec);
printf( "%-14sC%13.5f %08.4f %+08.4f",
intl_id, jd, ra * 180. / PI, dec * 180. / PI);
printf( " TLEs 500\n");
}
}
strcpy( line1, line2);
}
fclose( ifile);
return( 0);
} /* End of main() */
