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sattools/satid.c

618 lines
15 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <wcslib/cel.h>
#include <cpgplot.h>
#include "qfits.h"
#include "sgdp4h.h"
#define LIM 80
#define MMAX 10
#define D2R M_PI/180.0
#define R2D 180.0/M_PI
#define XKMPER 6378.135 // Earth radius in km
#define XKMPAU 149597879.691 // AU in km
#define FLAT (1.0/298.257)
#define STDMAG 6.0
long Isat=0;
long Isatsel=0;
extern double SGDP4_jd0;
struct map {
double lat,lng;
float alt;
char observer[32];
int site_id;
} m;
struct point {
double mjd;
xyz_t obspos,sunpos;
double zeta,z,theta;
} p[MMAX];
struct image {
char filename[64];
int naxis,naxis1,naxis2,nframes;
float *zavg,*zstd,*zmax,*znum;
double ra0,de0;
float x0,y0;
float a[3],b[3],xrms,yrms;
double mjd;
float *dt,exptime;
char nfd[32];
int cospar,tracked;
};
struct image read_fits(char *filename);
void get_site(int site_id);
double modulo(double,double);
void obspos_xyz(double,xyz_t *,xyz_t *);
void sunpos_xyz(double,xyz_t *);
double gmst(double);
double dgmst(double);
void precession_angles(double mjd0,double mjd,double *zeta,double *z,double *theta);
void initialize(struct image img);
void forward(double ra0,double de0,double ra,double de,double *x,double *y);
void reverse(double ra0,double de0,double x,double y,double *ra,double *de);
struct sat apparent_position(double mjd);
void plot_satellites(char *tlefile,struct image img,long satno,double mjd0,float dt,int color)
{
int i;
orbit_t orb;
int imode,flag,textflag,sflag;
FILE *fp=NULL,*file;
xyz_t satpos,satvel;
float x,y,x0,y0;
char norad[7],satname[30],state[16];
float isch;
char filename[128];
double dx,dy,dz,r,ra,de,d,rsun,rearth;
double psun,pearth,ptot;
double a,b,c;
double rx,ry;
cpgqch(&isch);
// Image determinant
d=img.a[1]*img.b[2]-img.a[2]*img.b[1];
// Open TLE file
fp=fopen(tlefile,"rb");
if (fp==NULL)
return;
cpgsci(color);
// Open file
sprintf(filename,"%s.id",img.filename);
file=fopen(filename,"a");
// Read TLEs
while (read_twoline(fp,satno,&orb)==0) {
Isat=orb.satno;
imode=init_sgdp4(&orb);
sprintf(norad," %05ld",Isat);
if (imode==SGDP4_ERROR)
continue;
// Loop over times
for (flag=0,textflag=0,sflag=0,i=0;i<MMAX;i++) {
// Satellite position
satpos_xyz(p[i].mjd+2400000.5,&satpos,&satvel);
// Check on radius
r=sqrt(satpos.x*satpos.x+satpos.y*satpos.y+satpos.z*satpos.z);
if (r>300000)
continue;
// Relative to observer
dx=satpos.x-p[i].obspos.x;
dy=satpos.y-p[i].obspos.y;
dz=satpos.z-p[i].obspos.z;
// Celestial position
r=sqrt(dx*dx+dy*dy+dz*dz);
ra=modulo(atan2(dy,dx),2.0*M_PI);
de=asin(dz/r);
// Correct for precession
a=cos(de)*sin(ra+p[i].zeta);
b=cos(p[i].theta)*cos(de)*cos(ra+p[i].zeta)-sin(p[i].theta)*sin(de);
c=sin(p[i].theta)*cos(de)*cos(ra+p[i].zeta)+cos(p[i].theta)*sin(de);
ra=modulo((atan2(a,b)+p[i].z)*R2D,360.0);
de=asin(c)*R2D;
// Adjust for stationary camera
if (img.tracked==0)
ra+=gmst(img.mjd+0.5*img.exptime/86400.0)-gmst(p[i].mjd);
// Check if nearby enough
r=acos(sin(img.de0*D2R)*sin(de*D2R)+cos(img.de0*D2R)*cos(de*D2R)*cos((img.ra0-ra)*D2R))*R2D;
if (r<90.0)
forward(img.ra0,img.de0,ra,de,&rx,&ry);
else
continue;
// Satellite position relative to the Sun
dx=-satpos.x+p[i].sunpos.x;
dy=-satpos.y+p[i].sunpos.y;
dz=-satpos.z+p[i].sunpos.z;
// Distances
rsun=sqrt(dx*dx+dy*dy+dz*dz);
rearth=sqrt(satpos.x*satpos.x+satpos.y*satpos.y+satpos.z*satpos.z);
// Angles
psun=asin(696.0e3/rsun)*R2D;
pearth=asin(6378.135/rearth)*R2D;
ptot=acos((-dx*satpos.x-dy*satpos.y-dz*satpos.z)/(rsun*rearth))*R2D;
// Visibility state
if (ptot-pearth<-psun) {
cpgsls(4);
strcpy(state,"eclipsed");
} else if (ptot-pearth>-psun && ptot-pearth<psun) {
cpgsls(2);
strcpy(state,"umbra");
sflag=1;
} else if (ptot-pearth>psun) {
cpgsls(1);
strcpy(state,"sunlit");
sflag=1;
}
// Convert image position
dx=rx-img.a[0];
dy=ry-img.b[0];
x=(img.b[2]*dx-img.a[2]*dy)/d+img.x0;
y=(img.a[1]*dy-img.b[1]*dx)/d+img.y0;
// Print name if in viewport
if (x>0.0 && x<img.naxis1 && y>0.0 && y<img.naxis2 && textflag==0) {
if (flag!=0)
cpgdraw(x,y);
cpgsch(0.65);
cpgtext(x,y,norad);
cpgsch(isch);
cpgmove(x,y);
textflag=1;
}
if (i==0) {
x0=x;
y0=y;
}
// Plot satellites
if (flag==0) {
cpgpt1(x,y,17);
cpgmove(x,y);
flag=1;
} else {
cpgdraw(x,y);
}
}
if (textflag==1) {
if (sflag==0)
fprintf(file,"%.23s %8.3f %8.3f %8.3f %8.3f %8.5f %s %s eclipsed\n",img.nfd+1,x0,y0,x,y,img.exptime,norad,tlefile);
else
fprintf(file,"%.23s %8.3f %8.3f %8.3f %8.3f %8.5f %s %s sunlit\n",img.nfd+1,x0,y0,x,y,img.exptime,norad,tlefile);
}
}
fclose(fp);
fclose(file);
cpgsci(1);
return;
}
int main(int argc,char *argv[])
{
int i;
struct image img;
float zmin,zmax,zavg,zstd;
float tr[]={-0.5,1.0,0.0,-0.5,0.0,1.0};
float heat_l[] = {0.0, 0.2, 0.4, 0.6, 1.0};
float heat_r[] = {0.0, 0.5, 1.0, 1.0, 1.0};
float heat_g[] = {0.0, 0.0, 0.5, 1.0, 1.0};
float heat_b[] = {0.0, 0.0, 0.0, 0.3, 1.0};
char text[128];
char *env,filename[128];
float sx,sy,wx,wy;
// Read fits file
img=read_fits(argv[1]);
// Set site
get_site(img.cospar);
// Initialize
initialize(img);
// Fill buffer
if (img.naxis==3) {
for (i=0,zavg=0.0;i<img.naxis1*img.naxis2;i++)
zavg+=img.zmax[i];
zavg/=(float) img.naxis1*img.naxis2;
for (i=0,zstd=0.0;i<img.naxis1*img.naxis2;i++)
zstd+=pow(img.zmax[i]-zavg,2);
zstd=sqrt(zstd/(float) (img.naxis1*img.naxis2));
zmin=zavg-2*zstd;
zmax=zavg+6*zstd;
} else {
for (i=0,zavg=0.0;i<img.naxis1*img.naxis2;i++)
zavg+=img.zavg[i];
zavg/=(float) img.naxis1*img.naxis2;
for (i=0,zstd=0.0;i<img.naxis1*img.naxis2;i++)
zstd+=pow(img.zavg[i]-zavg,2);
zstd=sqrt(zstd/(float) (img.naxis1*img.naxis2));
zmin=zavg-2*zstd;
zmax=zavg+6*zstd;
}
// Sizes
sx=sqrt(img.a[1]*img.a[1]+img.b[1]*img.b[1]);
sy=sqrt(img.a[2]*img.a[2]+img.b[2]*img.b[2]);
wx=img.naxis1*sx/3600.0;
wy=img.naxis2*sy/3600.0;
if (argc==3)
cpgopen(argv[2]);
else
cpgopen("/xs");
cpgpap(14.,1.0);
cpgsvp(0.1,0.95,0.1,0.8);
cpgsch(0.8);
sprintf(text,"UT Date: %.23s COSPAR ID: %04d",img.nfd+1,img.cospar);
cpgmtxt("T",6.0,0.0,0.0,text);
sprintf(text,"R.A.: %10.5f (%4.1f'') Decl.: %10.5f (%4.1f'')",img.ra0,img.xrms,img.de0,img.yrms);
if (img.xrms<1e-3 || img.yrms<1e-3 || img.xrms/sx>2.0 || img.yrms/sy>2.0)
cpgsci(2);
else
cpgsci(1);
cpgmtxt("T",4.8,0.0,0.0,text);
cpgsci(1);
sprintf(text,"FoV: %.2f\\(2218)x%.2f\\(2218) Scale: %.2f''x%.2f'' pix\\u-1\\d",wx,wy,sx,sy);
cpgmtxt("T",3.6,0.0,0.0,text);
sprintf(text,"Stat: %5.1f+-%.1f (%.1f-%.1f)",zavg,zstd,zmin,zmax);
cpgmtxt("T",2.4,0.0,0.0,text);
cpgsch(1.0);
cpgwnad(0.0,img.naxis1,0.0,img.naxis2);
cpglab("x (pix)","y (pix)"," ");
cpgctab (heat_l,heat_r,heat_g,heat_b,5,1.0,0.5);
if (img.naxis==3)
cpgimag(img.zmax,img.naxis1,img.naxis2,1,img.naxis1,1,img.naxis2,zmin,zmax,tr);
else
cpgimag(img.zavg,img.naxis1,img.naxis2,1,img.naxis1,1,img.naxis2,zmin,zmax,tr);
cpgbox("BCTSNI",0.,0,"BCTSNI",0.,0);
cpgstbg(1);
// Environment variables
env=getenv("ST_TLEDIR");
sprintf(filename,"%s/classfd.tle",env);
plot_satellites(filename,img,0,img.mjd,img.exptime,4);
sprintf(filename,"%s/inttles.tle",env);
plot_satellites(filename,img,0,img.mjd,img.exptime,3);
sprintf(filename,"%s/catalog.tle",env);
plot_satellites(filename,img,0,img.mjd,img.exptime,0);
sprintf(filename,"%s/jsc.txt",env);
plot_satellites(filename,img,0,img.mjd,img.exptime,5);
cpgend();
return 0;
}
// Read fits image
struct image read_fits(char *filename)
{
int i,j,k,l,m;
qfitsloader ql;
char key[FITS_LINESZ+1];
char val[FITS_LINESZ+1];
struct image img;
// Copy filename
strcpy(img.filename,filename);
// Image size
img.naxis=atoi(qfits_query_hdr(filename,"NAXIS"));
img.naxis1=atoi(qfits_query_hdr(filename,"NAXIS1"));
img.naxis2=atoi(qfits_query_hdr(filename,"NAXIS2"));
// MJD
img.mjd=(double) atof(qfits_query_hdr(filename,"MJD-OBS"));
strcpy(img.nfd,qfits_query_hdr(filename,"DATE-OBS"));
img.exptime=atof(qfits_query_hdr(filename,"EXPTIME"));
// COSPAR ID
img.cospar=atoi(qfits_query_hdr(filename,"COSPAR"));
// Tracked
if (qfits_query_hdr(filename,"TRACKED")!=NULL)
img.tracked=atoi(qfits_query_hdr(filename,"TRACKED"));
else
img.tracked=0;
// Transformation
img.ra0=atof(qfits_query_hdr(filename,"CRVAL1"));
img.de0=atof(qfits_query_hdr(filename,"CRVAL2"));
img.x0=atof(qfits_query_hdr(filename,"CRPIX1"));
img.y0=atof(qfits_query_hdr(filename,"CRPIX2"));
img.a[0]=0.0;
img.a[1]=3600.0*atof(qfits_query_hdr(filename,"CD1_1"));
img.a[2]=3600.0*atof(qfits_query_hdr(filename,"CD1_2"));
img.b[0]=0.0;
img.b[1]=3600.0*atof(qfits_query_hdr(filename,"CD2_1"));
img.b[2]=3600.0*atof(qfits_query_hdr(filename,"CD2_2"));
img.xrms=3600.0*atof(qfits_query_hdr(filename,"CRRES1"));
img.yrms=3600.0*atof(qfits_query_hdr(filename,"CRRES2"));
// Set parameters
ql.xtnum=0;
ql.ptype=PTYPE_FLOAT;
ql.filename=filename;
// Read four-frame info
if (img.naxis==3) {
// Number of frames
img.nframes=atoi(qfits_query_hdr(filename,"NFRAMES"));
// Timestamps
img.dt=(float *) malloc(sizeof(float)*img.nframes);
for (i=0;i<img.nframes;i++) {
sprintf(key,"DT%04d",i);
strcpy(val,qfits_query_hdr(filename,key));
sscanf(val+1,"%f",&img.dt[i]);
// img.dt[i]=atof(qfits_query_hdr(filename,key));
}
// Allocate image memory
img.zavg=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
img.zstd=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
img.zmax=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
img.znum=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
// Loop over planes
for (k=0;k<4;k++) {
ql.pnum=k;
// Initialize load
if (qfitsloader_init(&ql) != 0)
printf("Error initializing data loading\n");
// Test load
if (qfits_loadpix(&ql) != 0)
printf("Error loading actual data\n");
// Fill z array
for (i=0,l=0;i<img.naxis1;i++) {
for (j=0;j<img.naxis2;j++) {
if (k==0) img.zavg[l]=ql.fbuf[l];
if (k==1) img.zstd[l]=ql.fbuf[l];
if (k==2) img.zmax[l]=ql.fbuf[l];
if (k==3) img.znum[l]=ql.fbuf[l];
l++;
}
}
}
} else {
// Allocate image memory
img.zavg=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
ql.pnum=0;
// Initialize load
if (qfitsloader_init(&ql) != 0)
printf("Error initializing data loading\n");
// Test load
if (qfits_loadpix(&ql) != 0)
printf("Error loading actual data\n");
// Fill z array
for (i=0,l=0;i<img.naxis1;i++) {
for (j=0;j<img.naxis2;j++) {
img.zavg[l]=ql.fbuf[l];
l++;
}
}
}
return img;
}
// Get observing site
void get_site(int site_id)
{
int i=0;
char line[LIM];
FILE *file;
int id;
double lat,lng;
float alt;
char abbrev[3],observer[64],filename[LIM],*env;
env=getenv("ST_DATADIR");
sprintf(filename,"%s/data/sites.txt",env);
file=fopen(filename,"r");
if (file==NULL) {
printf("File with site information not found!\n");
return;
}
while (fgets(line,LIM,file)!=NULL) {
// Skip
if (strstr(line,"#")!=NULL)
continue;
// Strip newline
line[strlen(line)-1]='\0';
// Read data
sscanf(line,"%4d %2s %lf %lf %f",
&id,abbrev,&lat,&lng,&alt);
strcpy(observer,line+38);
// Change to km
alt/=1000.0;
if (id==site_id) {
m.lat=lat;
m.lng=lng;
m.alt=alt;
m.site_id=id;
strcpy(m.observer,observer);
}
}
fclose(file);
return;
}
// Greenwich Mean Sidereal Time
double gmst(double mjd)
{
double t,gmst;
t=(mjd-51544.5)/36525.0;
gmst=modulo(280.46061837+360.98564736629*(mjd-51544.5)+t*t*(0.000387933-t/38710000),360.0);
return gmst;
}
// Greenwich Mean Sidereal Time
double dgmst(double mjd)
{
double t,dgmst;
t=(mjd-51544.5)/36525.0;
dgmst=360.98564736629+t*(0.000387933-t/38710000);
return dgmst;
}
// Return x modulo y [0,y)
double modulo(double x,double y)
{
x=fmod(x,y);
if (x<0.0) x+=y;
return x;
}
// Observer position
void obspos_xyz(double mjd,xyz_t *pos,xyz_t *vel)
{
double ff,gc,gs,theta,s,dtheta;
s=sin(m.lat*D2R);
ff=sqrt(1.0-FLAT*(2.0-FLAT)*s*s);
gc=1.0/ff+m.alt/XKMPER;
gs=(1.0-FLAT)*(1.0-FLAT)/ff+m.alt/XKMPER;
theta=gmst(mjd)+m.lng;
dtheta=dgmst(mjd)*D2R/86400;
pos->x=gc*cos(m.lat*D2R)*cos(theta*D2R)*XKMPER;
pos->y=gc*cos(m.lat*D2R)*sin(theta*D2R)*XKMPER;
pos->z=gs*sin(m.lat*D2R)*XKMPER;
vel->x=-gc*cos(m.lat*D2R)*sin(theta*D2R)*XKMPER*dtheta;
vel->y=gc*cos(m.lat*D2R)*cos(theta*D2R)*XKMPER*dtheta;
vel->z=0.0;
return;
}
// Solar position
void sunpos_xyz(double mjd,xyz_t *pos)
{
double jd,t,l0,m,e,c,r;
double n,s,ecl,ra,de;
jd=mjd+2400000.5;
t=(jd-2451545.0)/36525.0;
l0=modulo(280.46646+t*(36000.76983+t*0.0003032),360.0)*D2R;
m=modulo(357.52911+t*(35999.05029-t*0.0001537),360.0)*D2R;
e=0.016708634+t*(-0.000042037-t*0.0000001267);
c=(1.914602+t*(-0.004817-t*0.000014))*sin(m)*D2R;
c+=(0.019993-0.000101*t)*sin(2.0*m)*D2R;
c+=0.000289*sin(3.0*m)*D2R;
r=1.000001018*(1.0-e*e)/(1.0+e*cos(m+c));
n=modulo(125.04-1934.136*t,360.0)*D2R;
s=l0+c+(-0.00569-0.00478*sin(n))*D2R;
ecl=(23.43929111+(-46.8150*t-0.00059*t*t+0.001813*t*t*t)/3600.0+0.00256*cos(n))*D2R;
ra=atan2(cos(ecl)*sin(s),cos(s));
de=asin(sin(ecl)*sin(s));
pos->x=r*cos(de)*cos(ra)*XKMPAU;
pos->y=r*cos(de)*sin(ra)*XKMPAU;
pos->z=r*sin(de)*XKMPAU;
return;
}
// Compute precession angles
void precession_angles(double mjd0,double mjd,double *zeta,double *z,double *theta)
{
double t0,t;
// Time in centuries
t0=(mjd0-51544.5)/36525.0;
t=(mjd-mjd0)/36525.0;
// Precession angles
*zeta=(2306.2181+1.39656*t0-0.000139*t0*t0)*t;
*zeta+=(0.30188-0.000344*t0)*t*t+0.017998*t*t*t;
*zeta*=D2R/3600.0;
*z=(2306.2181+1.39656*t0-0.000139*t0*t0)*t;
*z+=(1.09468+0.000066*t0)*t*t+0.018203*t*t*t;
*z*=D2R/3600.0;
*theta=(2004.3109-0.85330*t0-0.000217*t0*t0)*t;
*theta+=-(0.42665+0.000217*t0)*t*t-0.041833*t*t*t;
*theta*=D2R/3600.0;
return;
}
// Initialize observer and sun position and precession angles
void initialize(struct image img)
{
int i;
double t;
xyz_t obsvel;
// Loop over points
for (i=0;i<MMAX;i++) {
// Compute time
t=img.exptime*(float) i/(float) (MMAX-1);
p[i].mjd=img.mjd+t/86400.0;
// Compute observer and sun position
obspos_xyz(p[i].mjd,&p[i].obspos,&obsvel);
sunpos_xyz(p[i].mjd,&p[i].sunpos);
// Compute precession angles
precession_angles(p[i].mjd,51544.5,&p[i].zeta,&p[i].z,&p[i].theta);
}
return;
}
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