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/******************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
******************************************************************************
*
* Synopsis: read_tle(fitsfile *fptr)
*
* Description: read_tle will read the standard tle format file FUSE.TLE
* and place the orbital elements into the header of the
* fitsfile. The FUSE.TLE file will contain multiple orbital
* element sets, so the set closest in time to the observation
* will be used.
*
* Arguments: fitsfile *fptr Pointer to input file
*
* History: 11/11/98 emurphy Begin work.
* 03/18/98 emurphy Added To do list.
* 04/08/99 peb Tidied code and added necessary
* include files
* 06/07/99 peb Added reporting of version control.
* 06/22/99 peb Added FITS_ wrappers.
* 08/05/99 emm Added statements to print date
* of obs and TLE if dtime > 5.
* Also modified program to work with
* FES keywords TEXPSTRT and TEXPEND
* 05/31/00 peb Implemented cfortran.h calls for slalib
* functions.
* 02/13/03 v1.4 wvd Change 0 to NULL in FITS_update_key
* 03/01/03 v1.5 wvd Correct use of pointer in FITS_read_key
* 04/01/03 v1.6 wvd Replace cf_errmsg with cf_if_warning,
* printf with cf_verbose
* 12/18/03 v1.7 bjg Change calfusettag.h to calfuse.h
* 04/07/07 v1.8 wvd Initialize min_mjd to zero to silence
* compiler warnings.
*
*****************************************************************************/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef CFORTRAN
#include "cfortran.h"
PROTOCCALLSFSUB5(SLA_CLDJ, sla_cldj, INT, INT, INT, PDOUBLE, PINT)
#define slaCldj(IY, IM, ID, DJM, J) \
CCALLSFSUB5(SLA_CLDJ, sla_cldj, INT, INT, INT, PDOUBLE, PINT, \
IY, IM, ID, DJM, J)
#else
#include "slalib.h"
#include "slamac.h"
#endif
#include "calfuse.h"
#define MAXCHARS 120
static char CF_PRGM_ID[] = "read_tle";
static char CF_VER_NUM[] = "1.8";
void read_tle(fitsfile *fptr)
{
char line1[MAXCHARS], line2[MAXCHARS], line3[MAXCHARS];
char sat_num[10], security_class[10], international_num[10];
char inchar[15][15], sp[15][2], sgn[4][2];
char comment[FLEN_CARD], eccen_str[20];
char n6_mant_str[20], drag_mant_str[20], instrument[FLEN_CARD];
int status=0, hdutype=0, card_num, epoch_year, n6_exponent;
int drag_exponent, ephemeris, elset_num, checksum1, checksum2;
int rev_num, e_month, e_day;
double n6_mantissa, drag_mantissa, epoch_day, n2, inclin, raan;
double aop, mean_anom, mean_mot, n6, drag, semimaj, revspersec;
double expstart, expend, expmiddle, eccentr, dtime=1.0e9;
double i_day, f_day, mjd, mjd_f, mjd_d, min_mjd=0;
FILE *ftle;
/* Enter a timestamp into the log. */
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Begin reading TLE file");
/* Open the file with the standard two-line elements. */
ftle = NULL;
ftle = fopen(cf_cal_file("FUSE.TLE"),"r");
if (ftle == NULL)
cf_if_error("Cannot find file FUSE.TLE, which contains the"
" orbital elements.");
/* Rewind the fits file and get the start time of the exposure */
FITS_movabs_hdu(fptr, 1, &hdutype, &status);
FITS_read_key(fptr, TSTRING, "INSTRUME", instrument, comment, &status);
/* In the primary header, the FES files use keywords with a different
name. This is because the FES may have many exposures in a file.
The TEXPSTRT is the start of the first exposure and TEXPEND is the
end of the last exposure. */
if (!strncmp(instrument,"FES",3)) {
/* Read in FES keywords */
FITS_read_key(fptr, TDOUBLE, "TEXPSTRT", &expstart, comment, &status);
FITS_read_key(fptr, TDOUBLE, "TEXPEND", &expend, comment, &status);
} else {
/* Read in FUV keywords */
FITS_read_key(fptr, TDOUBLE, "EXPSTART", &expstart, comment, &status);
FITS_read_key(fptr, TDOUBLE, "EXPEND", &expend, comment, &status);
}
/* expmiddle is in mjd */
expmiddle = (expstart+expend)/2.0;
/* Read in FUSE.TLE file by getting one line at a time */
while (fgets(line1, MAXCHARS,ftle) != NULL) {
fgets(line2, MAXCHARS, ftle);
fgets(line3, MAXCHARS, ftle);
#ifdef DEBUG
printf("\n\n%-80.80s\n",line1);
printf("%-80.80s\n",line2);
printf("%-80.80s\n",line3);
#endif
/*
* This may look like a stupid way to do this, but it has to be
* done this way. You see, the fields can contain leading blanks
* which should be interpreted as zeros. However, c skips over
* leading blanks when reading %f and %d.
*/
sscanf(line2,"%1c%1c%5c%1c%1c%8c%1c%2c%12c%1c%1c%9c%1c%1c%5c%2c%1c"
"%1c%5c%2c%1c%1c%1c%4c%1c",
inchar[1],sp[1],inchar[2],inchar[3],sp[2],inchar[4],sp[3],
inchar[5],inchar[6],sp[4],sgn[1],inchar[7],sp[5],sgn[2],
inchar[8],inchar[9],sp[6],sgn[3],inchar[10],inchar[11],
sp[7],inchar[12], sp[8],inchar[13],inchar[14]);
inchar[1][1]='\0';
card_num=atoi(inchar[1]);
inchar[2][5]='\0';
strncpy(sat_num,inchar[2],5);
inchar[3][1]='\0';
strncpy(security_class,inchar[3],1);
inchar[4][8]='\0';
strncpy(international_num,inchar[4],8);
inchar[5][2]='\0';
epoch_year=atoi(inchar[5]);
if (epoch_year < 50)
epoch_year+=2000;
else
epoch_year+=1900;
inchar[6][12]='\0';
epoch_day=atof(inchar[6]);
inchar[7][9]='\0';
n2=atof(inchar[7]);
if (sgn[1][0] == '-')
n2*=-1.0;
inchar[8][5]='\0';
strcpy(n6_mant_str,"0.");
strncat(n6_mant_str,inchar[8],7);
#ifdef DEBUG
printf("n6=%-10.10s\n",n6_mant_str);
#endif
n6_mantissa=atof(n6_mant_str);
if (sgn[2][0] == '-')
n6_mantissa*=-1.0;
inchar[9][2]='\0';
n6_exponent=atoi(inchar[9]);
inchar[10][5]='\0';
strcpy(drag_mant_str,"0.");
strncat(drag_mant_str,inchar[10],7);
#ifdef DEBUG
printf("Drag=%-10.10s\n",drag_mant_str);
#endif
drag_mantissa=atof(drag_mant_str);
if (sgn[3][0] == '-')
drag_mantissa*=-1.0;
inchar[11][2]='\0';
drag_exponent=atoi(inchar[11]);
inchar[12][1]='\0';
ephemeris=atoi(inchar[12]);
inchar[13][4]='\0';
elset_num=atoi(inchar[13]);
inchar[14][1]='\0';
checksum1=atoi(inchar[14]);
n6=n6_mantissa*pow(10.0,(double) n6_exponent);
drag=drag_mantissa*pow(10.0,(double) drag_exponent);
#ifdef DEBUG
printf("n6=>%10.5f %5d %15.6E\n", n6_mantissa, n6_exponent, n6);
printf("drag=>%10.5f %5d %15.6E\n", drag_mantissa,
drag_exponent, drag);
for(i=1; i<=14; i++)
printf("%2d %-15.15s\n",i,inchar[i]);
for(i=1; i<=3; i++)
printf("%2d %-5.5s\n",i,sgn[i]);
#endif
sscanf(line3,"%1c%1c%5c%1c%8c%1c%8c%1c%7c%1c%8c%1c%8c%1c%11c%5c%1c",
inchar[1],sp[1],inchar[2],sp[2],inchar[3],sp[3],inchar[4],
sp[4],inchar[5],sp[5],inchar[6],sp[6],inchar[7],sp[7],
inchar[8],inchar[9],inchar[10]);
inchar[1][1]='\0';
card_num=atoi(inchar[1]);
inchar[2][5]='\0';
strncpy(sat_num,inchar[2],5);
inchar[3][8]='\0';
inclin=atof(inchar[3]);
inchar[4][8]='\0';
raan=atof(inchar[4]);
inchar[5][7]='\0';
/*
* strcpy(eccen_str,"0.");
* strncat(eccen_str,inchar[5],8);
*/
sprintf(eccen_str,"0.%-8s",inchar[5]);
#ifdef DEBUG
printf("Ecstr=%-20.20s\n",eccen_str);
#endif
eccentr=atof(eccen_str);
inchar[6][8]='\0';
aop=atof(inchar[6]);
inchar[7][8]='\0';
mean_anom=atof(inchar[7]);
inchar[8][11]='\0';
mean_mot=atof(inchar[8]);
inchar[9][5]='\0';
rev_num=atof(inchar[9]);
inchar[10][1]='\0';
checksum2=atoi(inchar[10]);
#ifdef DEBUG
for(i=1; i<=10; i++)
printf("%2d %-15.15s\n",i,inchar[i]);
printf("%4d\n%12.8f\n%10.8f\n%10.5E\n%10.5E%5d%5d%5d\n",
epoch_year, epoch_day, n2, n6, drag, ephemeris,
elset_num, checksum1);
printf("\n%8.4f\n%8.4f\n%10.8f\n%8.4f\n%8.4f\n%11.8f\n%5d\n%1d\n",
inclin, raan, (float) eccentr, aop, mean_anom,
mean_mot, rev_num, checksum2);
#endif
/* Convert the year and day of year into a year month day */
f_day = modf(epoch_day, &i_day);
month_day(epoch_year, (int) i_day, &e_month, &e_day);
/* Convert year month day into a Julian date. */
#ifdef CFORTRAN
slaCldj(epoch_year, e_month, e_day, mjd, status);
#else
slaCldj(epoch_year, e_month, e_day, &mjd, &status);
#endif
mjd += f_day;
if (fabs(expmiddle-mjd) < dtime) {
dtime = fabs(expmiddle-mjd);
min_mjd=mjd;
revspersec = mean_mot/(24.0*60.0*60.0);
semimaj = pow(MU/(4.0*PI*PI*revspersec*revspersec),1.0/3.0);
mjd_f=modf(mjd, &mjd_d);
FITS_update_key(fptr, TDOUBLE, "EPCHTIMD", &mjd_d, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "EPCHTIMF", &mjd_f, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "INCLINAT", &inclin, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "ECCENTRY", &eccentr, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "MEANANOM", &mean_anom, NULL,&status);
FITS_update_key(fptr, TDOUBLE, "ARGPERIG", &aop, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "RASCASCN", &raan, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "SEMIMAJR", &semimaj, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "MEANMOTN", &mean_mot, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "FDM2COEF", &n2, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "SDM6COEF", &n6, NULL, &status);
FITS_update_key(fptr, TDOUBLE, "DRAGCOEF", &drag, NULL, &status);
FITS_update_key(fptr, TSTRING, "PROPMODL", "SGP4", NULL, &status);
}
} /* endwhile */
if (dtime > 5.0) {
cf_verbose(2, "MJD OBS=%12.5f MJD TLE=%12.5f DT=%12.5f\n",
expmiddle, min_mjd, dtime);
cf_if_warning("Orbital elements are more than 5 days old.");
}
/* Enter a timestamp into the log. */
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done reading TLE file");
}
|
