157 lines
3.4 KiB
C
157 lines
3.4 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <getopt.h>
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#include "sgdp4h.h"
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#include "satutl.h"
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#define LIM 128
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#define XKMPER 6378.135 /* Km per earth radii */
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#define XMNPDA 1440.0 /* Minutes per day */
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#define AE 1.0 /* Earth radius in "chosen units". */
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#define XKE 0.743669161e-1
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#define CK2 5.413080e-4 /* (0.5 * XJ2 * AE * AE) */
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extern double SGDP4_jd0;
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void usage(void)
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{
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return;
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}
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// Compute Julian Day from Date
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double date2mjd(int year,int month,double day)
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{
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int a,b;
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double jd;
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if (month<3) {
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year--;
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month+=12;
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}
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a=floor(year/100.);
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b=2.-a+floor(a/4.);
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if (year<1582) b=0;
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if (year==1582 && month<10) b=0;
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if (year==1852 && month==10 && day<=4) b=0;
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jd=floor(365.25*(year+4716))+floor(30.6001*(month+1))+day+b-1524.5;
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return jd-2400000.5;
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}
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// DOY to MJD
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double doy2mjd(int year,double doy)
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{
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int month,k=2;
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double day;
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if (year%4==0 && year%400!=0)
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k=1;
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month=floor(9.0*(k+doy)/275.0+0.98);
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if (doy<32)
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month=1;
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day=doy-floor(275.0*month/9.0)+k*floor((month+9.0)/12.0)+30.0;
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return date2mjd(year,month,day);
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}
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void orbit(orbit_t orb,float *aodp,float *perigee,float *apogee,float *period)
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{
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float xno,eo,xincl;
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float a1,betao2,betao,temp0,del1,a0,del0,xnodp;
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xno=orb.rev*2.0*M_PI/XMNPDA;
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eo=orb.ecc;
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xincl=orb.eqinc;
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a1 = pow(XKE / xno, 2.0/3.0);
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betao2 = 1.0 - eo * eo;
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betao = sqrt(betao2);
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temp0 = (1.5 * CK2) * cos(xincl)*cos(xincl) / (betao * betao2);
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del1 = temp0 / (a1 * a1);
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a0 = a1 * (1.0 - del1 * (1.0/3.0 + del1 * (1.0 + del1 * 134.0/81.0)));
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del0 = temp0 / (a0 * a0);
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xnodp = xno / (1.0 + del0);
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*aodp = (a0 / (1.0 - del0));
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*perigee = (*aodp * (1.0 - eo) - 1) * XKMPER;
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*apogee = (*aodp * (1.0 + eo) - 1) * XKMPER;
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*period = (TWOPI * 1440.0 / XMNPDA) / xnodp;
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*aodp=(*aodp-1)*XKMPER;
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return;
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}
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int main(int argc,char *argv[])
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{
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int arg=0,satno=0,quiet=0;
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char tlefile[LIM];
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char line0[70],line1[70],line2[70];
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FILE *file;
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orbit_t orb;
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float aodp,perigee,apogee,period;
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int info=0;
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double mjd;
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char *env;
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env=getenv("ST_TLEDIR");
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sprintf(tlefile,"%s/classfd.tle",env);
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// Decode options
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while ((arg=getopt(argc,argv,"c:i:aq"))!=-1) {
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switch (arg) {
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case 'c':
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strcpy(tlefile,optarg);
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break;
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case 'i':
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satno=atoi(optarg);
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break;
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case 'a':
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info=1;
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break;
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case 'q':
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quiet=1;
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break;
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case 'h':
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usage();
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return 0;
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break;
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default:
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usage();
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return 0;
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}
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}
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// Open file
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file=fopen(tlefile,"rb");
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if (file==NULL)
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fatal_error("File open failed for reading \"%s\"",tlefile);
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if (info==0 && quiet==0)
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printf("SATNO YEAR DOY INCL ASCN ARGP MA ECC MM\n");
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if (info==1 && quiet==0)
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printf("SATNO SEMI PERIGEE APOGEE PERIOD ECC\n");
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// Loop over file
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while (read_twoline(file,satno,&orb)==0) {
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orbit(orb,&aodp,&perigee,&apogee,&period);
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mjd=doy2mjd(orb.ep_year,orb.ep_day);
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if (info==0) printf("%05d %10.4lf %8.4f %8.4f %8.4f %8.4f %8.6f %8.5f\n",orb.satno,mjd,DEG(orb.eqinc),DEG(orb.ascn),DEG(orb.argp),DEG(orb.mnan),orb.ecc,orb.rev);
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if (info==1) printf("%05d %9.2f %9.2f %9.2f %8.2f %8.6f %14.8lf\n",orb.satno,aodp,perigee,apogee,period,orb.ecc,mjd);
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}
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fclose(file);
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return 0;
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}
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