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satfit.c
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satfit.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "cpgplot.h"
#include "cel.h"
#include "sgdp4h.h"
#include <getopt.h>
#define LIM 80
#define NMAX 256
#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 XKE 0.07436680 // Guassian Gravitational Constant
#define AE 1.0
#define XMNPDA 1440.0
long Isat=0;
long Isatsel=0;
extern double SGDP4_jd0;
struct point {
int flag,satno;
char desig[10];
double mjd,ra,de,rac,dec;
float st,sr;
char iod_line[LIM];
double dx,dy,dr,dt;
xyz_t obspos;
};
struct doppler {
double mjd,freq,v;
xyz_t obspos,obsvel;
};
struct data {
int n,nsel,m;
struct point *p;
struct doppler *q;
double chisq,rms;
} d;
struct site {
int id;
double lng,lat;
float alt;
char observer[64];
};
orbit_t orb;
struct site get_site(int site_id);
struct point decode_iod_observation(char *iod_line);
struct doppler decode_doppler_observation(char *line);
int fgetline(FILE *file,char *s,int lim);
double modulo(double x,double y);
double gmst(double mjd);
double dgmst(double mjd);
double date2mjd(int year,int month,double day);
double mjd2doy(double mjd,int *yr);
void mjd2date(double mjd,int *year,int *month,double *day);
void obspos_xyz(double mjd,double lng,double lat,float alt,xyz_t *pos,xyz_t *vel);
void precess(double mjd0,double ra0,double de0,double mjd,double *ra,double *de);
void forward(double ra0,double de0,double ra,double de,double *x,double *y);
struct data read_data(char *iodfname,char *dopfname);
void versafit(int m,int n,double *a,double *da,double (*func)(double *),double dchisq,double tol,char *opt);
double chisq(double a[]);
orbit_t read_tle(char *filename,int satno);
void format_tle(orbit_t orb,char *line1,char *line2);
void highlight(float x0,float y0,float x,float y,int flag);
void time_range(double *mjdmin,double *mjdmax,int flag);
void print_tle(orbit_t orb,char *filename);
void fit(orbit_t orb,int *ia);
void usage();
double nfd2mjd(char *date);
double dot(xyz_t a,xyz_t b);
double magnitude(xyz_t a);
xyz_t cross(xyz_t a,xyz_t b);
orbit_t classel(int ep_year,double ep_day,xyz_t r,xyz_t v);
orbit_t rv2el(int satno,double mjd,xyz_t r0,xyz_t v0);
// Propagate elements
void propagate(double mjd)
{
int imode;
xyz_t r,v;
char desig[20],line1[80],line2[80];
// Store designation
strcpy(desig,orb.desig);
// Propagate
imode=init_sgdp4(&orb);
imode=satpos_xyz(mjd+2400000.5,&r,&v);
// Convert
orb=rv2el(orb.satno,mjd,r,v);
// Copy designation
strcpy(orb.desig,desig);
return;
}
xyz_t get_position(double r0,int i0)
{
int i;
double rr,drr,r;
xyz_t pos;
double x,y,z;
// Initial range
rr=100.0;
do {
x=d.p[i0].obspos.x+rr*cos(d.p[i0].ra*D2R)*cos(d.p[i0].de*D2R);
y=d.p[i0].obspos.y+rr*sin(d.p[i0].ra*D2R)*cos(d.p[i0].de*D2R);
z=d.p[i0].obspos.z+rr*sin(d.p[i0].de*D2R);
r=sqrt(x*x+y*y+z*z);
drr=r-r0;
rr-=drr;
} while (fabs(drr)>0.01);
pos.x=x;
pos.y=y;
pos.z=z;
return pos;
}
int period_search(void)
{
int i,j,i1,i2;
float dt;
int nrev,nrevmin,nrevmax;
char line1[70],line2[70];
int ia[7];
// Set fitting parameters
for (i=0;i<6;i++)
ia[i]=1;
ia[6]=0;
// Select all points
for (i=0;i<d.n;i++)
d.p[i].flag=2;
// Print observations
printf("Present observations:\n");
for (i=0;i<d.n;i++)
printf("%3d: %s\n",i+1,d.p[i].iod_line);
printf("\nSelect center observations of both arcs: ");
scanf("%d %d",&i1,&i2);
dt=d.p[i2].mjd-d.p[i1].mjd;
printf("\nTime passed: %f days\n",dt);
printf("Provide revolution range to search over [min,max]: ");
scanf("%d %d",&nrevmin,&nrevmax);
for (nrev=nrevmin;nrev<nrevmax+1;nrev++) {
orb.satno=79000+nrev;
orb.rev=nrev/dt;
// Set parameters
for (i=0;i<7;i++)
ia[i]=0;
// Loop over parameters
for (i=0;i<6;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
if (i==3) ia[3]=1;
if (i==4) ia[2]=1;
if (i==5) ia[5]=1;
for (j=0;j<5;j++)
fit(orb,ia);
}
format_tle(orb,line1,line2);
printf("%s\n%s\n# %d revs, %f revs/day, %f\n",line1,line2,nrev,nrev/dt,d.rms);
}
return;
}
int ewsearch(void)
{
int i,satno=88300;
double mjdmin,mjdmax;
int ia[7]={0,0,0,0,0,0,0};
double ecc,eccmin,eccmax,decc;
double rev,revmin,revmax,drev;
double argp,argpmin,argpmax,dargp;
char line1[70],line2[70];
FILE *file,*tlefile;
int year,month;
double day;
// Provide
printf("Eccentricity [min, max, stepsize]: \n");
scanf("%lf %lf %lf",&eccmin,&eccmax,&decc);
printf("Argument of perigee [min, max, stepsize]: \n");
scanf("%lf %lf %lf",&argpmin,&argpmax,&dargp);
// Step 2: get time range
time_range(&mjdmin,&mjdmax,2);
// Open files
file=fopen("search.dat","w");
tlefile=fopen("search.tle","w");
// Step 4: Loop over eccentricity
for (ecc=eccmin;ecc<eccmax;ecc+=decc) {
for (argp=argpmin;argp<argpmax;argp+=dargp) {
orb.satno=satno++;
orb.ecc=ecc;
orb.argp=argp*D2R;
// Set parameters
for (i=0;i<7;i++)
ia[i]=0;
// Step 4: loop over parameters
for (i=0;i<4;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
if (i==3) ia[5]=1;
// if (i==4) ia[3]=1;
// Do fit
fit(orb,ia);
}
fit(orb,ia);
fit(orb,ia);
fit(orb,ia);
printf("%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
fprintf(file,"%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
format_tle(orb,line1,line2);
fprintf(tlefile,"OBJ\n%s\n%s\n",line1,line2);
mjd2date(mjdmin,&year,&month,&day);
fprintf(tlefile,"# %4d%02d%05.2lf-",year,month,day);
mjd2date(mjdmax,&year,&month,&day);
fprintf(tlefile,"%4d%02d%05.2lf, %d measurements, %.5lf deg rms\n",year,month,day,d.n,d.rms);
}
fprintf(file,"\n");
}
fclose(file);
fclose(tlefile);
return orb.satno;
}
int revsearch(void)
{
int i,satno=88300;
double mjdmin,mjdmax;
int ia[7]={0,0,0,0,0,0,0};
double ecc,eccmin,eccmax,decc;
double rev,revmin,revmax,drev;
double argp,argpmin,argpmax,dargp;
char line1[70],line2[70];
FILE *file,*tlefile;
int year,month;
double day;
// Provide
printf("Mean motion [min, max, stepsize]: \n");
scanf("%lf %lf %lf",&revmin,&revmax,&drev);
// Step 1: select all points
// for (i=0;i<d.n;i++)
// d.p[i].flag=2;
// Step 2: get time range
time_range(&mjdmin,&mjdmax,2);
// Open files
file=fopen("search.dat","w");
tlefile=fopen("search.tle","w");
// Step 4: Loop over eccentricity
for (rev=revmin;rev<revmax;rev+=drev) {
orb.satno=satno++;
orb.rev=rev;
// Set parameters
for (i=0;i<7;i++)
ia[i]=0;
// Step 4: loop over parameters
for (i=0;i<5;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
if (i==3) ia[2]=1;
if (i==4) ia[3]=1;
// Do fit
fit(orb,ia);
}
fit(orb,ia);
fit(orb,ia);
fit(orb,ia);
printf("%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
fprintf(file,"%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
format_tle(orb,line1,line2);
fprintf(tlefile,"OBJ\n%s\n%s\n",line1,line2);
mjd2date(mjdmin,&year,&month,&day);
fprintf(tlefile,"# %4d%02d%05.2lf-",year,month,day);
mjd2date(mjdmax,&year,&month,&day);
fprintf(tlefile,"%4d%02d%05.2lf, %d measurements, %.5lf deg rms\n",year,month,day,d.n,d.rms);
}
fclose(file);
fclose(tlefile);
return orb.satno;
}
int psearch(void)
{
int i,satno=99300;
double mjdmin,mjdmax;
int ia[7]={0,0,0,0,0,0,0};
double ecc,eccmin,eccmax,decc;
double rev,revmin,revmax,drev;
double argp,argpmin,argpmax,dargp;
char line1[70],line2[70];
FILE *file;
// Provide
printf("Mean motion [min, max, stepsize]: \n");
scanf("%lf %lf %lf",&revmin,&revmax,&drev);
printf("Eccentricity [min, max, stepsize]: \n");
scanf("%lf %lf %lf",&eccmin,&eccmax,&decc);
// printf("Argument of perigee [min, max, stepsize]: \n");
// scanf("%lf %lf %lf",&argpmin,&argpmax,&dargp);
// Step 1: select all points
// for (i=0;i<d.n;i++)
// d.p[i].flag=2;
// Step 2: get time range
time_range(&mjdmin,&mjdmax,2);
file=fopen("search.dat","w");
// Step 4: Loop over eccentricity
for (rev=revmin;rev<revmax;rev+=drev) {
for (ecc=eccmin;ecc<eccmax;ecc+=decc) {
// for (argp=argpmin;argp<argpmax;argp+=dargp) {
orb.satno=satno;
orb.ecc=ecc;
orb.rev=rev;
//orb.argp=argp*D2R;
// Set parameters
for (i=0;i<7;i++)
ia[i]=0;
// Step 4: loop over parameters
for (i=0;i<5;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
// if (i==3) ia[5]=1;
if (i==4) ia[3]=1;
// Do fit
fit(orb,ia);
}
fit(orb,ia);
fit(orb,ia);
fit(orb,ia);
printf("%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
fprintf(file,"%8.5lf %8.6lf %8.3lf %8.3lf %8.3lf %8.3lf %8.5lf\n",orb.rev,orb.ecc,orb.argp*R2D,orb.ascn*R2D,orb.mnan*R2D,orb.eqinc*R2D,d.rms);
}
fprintf(file,"\n");
// }
}
fclose(file);
return orb.satno;
}
int circular_fit(void)
{
int i;
double mjdmin,mjdmax;
int ia[7]={0,0,0,0,0,0,0};
// Step 1: select all points
// for (i=0;i<d.n;i++)
// d.p[i].flag=2;
// Step 2: get time range
time_range(&mjdmin,&mjdmax,2);
// Step 3: set initial orbit
orb.satno=d.p[0].satno;
orb.eqinc=0.5*M_PI;
orb.ascn=0.0;
orb.ecc=0.0001;
orb.argp=0.0;
orb.mnan=0.0;
orb.rev=14.0;
orb.bstar=0.5e-4;
orb.ep_day=mjd2doy(0.5*(mjdmin+mjdmax),&orb.ep_year);
// Step 4: loop over parameters
for (i=0;i<4;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
if (i==3) ia[5]=1;
// Do fit
fit(orb,ia);
}
fit(orb,ia);
return orb.satno;
}
int adjust_fit(int depth)
{
int i;
double mjdmin,mjdmax;
int ia[6]={0,0,0,0,0,0};
// Step 2: loop over parameters
for (i=0;i<depth;i++) {
if (i==0) ia[4]=1;
if (i==1) ia[1]=1;
if (i==2) ia[0]=1;
if (i==3) ia[5]=1;
if (i==4) ia[2]=1;
if (i==5) ia[3]=1;
// Do fit
fit(orb,ia);
}
fit(orb,ia);
return orb.satno;
}
void old_circular_fit(void)
{
int i,j,i0,i1;
float r0=6500;
xyz_t pos0,pos1;
double ang,dt,w,w0;
// Get end points
for (i=0,j=0;i<d.n;i++) {
if (d.p[i].flag==2) {
if (j==0)
i0=i;
i1=i;
j++;
}
}
// Time difference
dt=86400.0*(d.p[i1].mjd-d.p[i0].mjd);
i=0;
do {
w0=360.0/(2.0*M_PI*sqrt(r0*r0*r0/398600));
// Get positions
pos0=get_position(r0,i0);
pos1=get_position(r0,i1);
// Compute angle
ang=acos((pos0.x*pos1.x+pos0.y*pos1.y+pos0.z*pos1.z)/(r0*r0))*R2D;
// Angular motion (deg/sec);
w=ang/dt;
r0+=1000.0*(w0-w);
i++;
} while (fabs(w0-w)>1e-5 && i<1000);
printf("%f\n",r0);
return;
}
int main(int argc,char *argv[])
{
int i,j,nobs=0;
int redraw=1,plot_residuals=0,adjust=0,quit=0,identify=0;
int ia[]={0,0,0,0,0,0,0};
float dx[]={0.1,0.1,0.35,0.35,0.6,0.6,0.85},dy[]={0.0,-0.25,0.0,-0.25,0.0,-0.25,0.0};
char c;
int mode=0,posn=0,click=0;
float x0,y0,x,y;
float xmin=0.0,xmax=360.0,ymin=-90.0,ymax=90.0;
char string[64],bstar[10]=" 50000-4",line0[72],line1[72],line2[72],text[10];
char filename[64],nfd[32];
int satno=-1;
double mjdmin,mjdmax,mjd=0.0;
int length=864000;
int arg=0,elset=0,circular=0,tleout=0,noplot=0;
char *ioddatafile=NULL,*dopdatafile=NULL,*catalog,tlefile[LIM];
orbit_t orb0;
FILE *file;
// Decode options
while ((arg=getopt(argc,argv,"d:r:c:i:haCo:pIt:l:m:"))!=-1) {
switch(arg) {
case 'd':
ioddatafile=optarg;
break;
case 'r':
dopdatafile=optarg;
break;
case 'c':
catalog=optarg;
break;
case 'i':
satno=atoi(optarg);
break;
case 't':
strcpy(nfd,optarg);
mjd=nfd2mjd(nfd);
break;
case 'm':
mjd=(double) atof(optarg);
break;
case 'l':
length=atoi(optarg);
if (strchr(optarg,'h')!=NULL)
length*=3600;
else if (strchr(optarg,'m')!=NULL)
length*=60;
else if (strchr(optarg,'d')!=NULL)
length*=86400;
break;
case 'C':
circular=1;
break;
case 'p':
noplot=1;
break;
case 'o':
tleout=1;
strcpy(tlefile,optarg);
break;
case 'h':
usage();
return 0;
break;
case 'a':
adjust=1;
break;
case 'I':
identify=1;
break;
default:
usage();
return 0;
}
}
// Read data
d=read_data(ioddatafile,dopdatafile);
// Select observations based on time
if (mjd>0.0) {
mjdmin=mjd-length/86400.0;
mjdmax=mjd;
for (i=0;i<d.n;i++) {
if (d.p[i].mjd>mjdmin && d.p[i].mjd<=mjdmax && d.p[i].flag==1)
d.p[i].flag=2;
else
d.p[i].flag=0;
}
}
time_range(&mjdmin,&mjdmax,1);
// Read TLE
if (satno>=0)
orb=read_tle(catalog,satno);
// Open catalog
if (identify==1) {
file=fopen(catalog,"r");
if (file==NULL)
fatal_error("Failed to open %s\n",catalog);
}
// Reloop stderr
freopen("/tmp/stderr.txt","w",stderr);
// Fit circular orbit
if (circular==1) {
for (i=0;i<d.n;i++)
d.p[i].flag=2;
satno=circular_fit();
plot_residuals=1;
quit=1;
// Dump tle
if (tleout==1)
print_tle(orb,tlefile);
}
// Identify
if (identify==1) {
// Select all points
for (i=0;i<d.n;i++)
d.p[i].flag=2;
// Reset satno
if (satno==-1)
satno=0;
// Loop over file
while (read_twoline(file,satno,&orb)==0) {
orb0=orb;
adjust_fit(2);
fit(orb,ia);
printf("%05d %8.3f %8.3f %8.3f %s %8.3f\n",orb.satno,DEG(orb.mnan-orb0.mnan),DEG(orb.ascn-orb0.ascn),d.rms,ioddatafile,mjdmin-(SGDP4_jd0-2400000.5));
}
fclose(file);
plot_residuals=1;
redraw=1;
quit=1;
noplot=1;
}
// Adjust
if (adjust==1) {
// Count observations
for (i=0,nobs=0;i<d.n;i++) {
if (d.p[i].flag==1) {
d.p[i].flag=2;
nobs++;
}
}
// Not enough observations
if (nobs<10)
return 0;
// Get last point
for (i=0,j=0;i<d.n;i++) {
if (d.p[i].flag==2) {
if (j==0) mjdmax=d.p[i].mjd;
if (d.p[i].mjd>mjdmax) mjdmax=d.p[i].mjd;
j++;
}
}
// Propagate orbit to time of last observation
propagate(mjdmax);
orb0=orb;
// Fit
adjust_fit(16);
// Print results
// printf("%05d %8.3f %8.3f %8.3f %s %8.3f %d\n",satno,DEG(orb.mnan-orb0.mnan),DEG(orb.ascn-orb0.ascn),d.rms,ioddatafile,mjdmin-(SGDP4_jd0-2400000.5),d.nsel);
// Dump tle
if (tleout==1)
print_tle(orb,tlefile);
// Set thingies
plot_residuals=1;
redraw=1;
quit=1;
}
// Exit before plotting
if (quit==1 && noplot==1) {
if (d.n) free(d.p);
if (d.m) free(d.q);
fclose(stderr);
return 0;
}
cpgopen("/xs");
cpgask(0);
// For ever loop
for (;;) {
if (redraw==1) {
cpgpage();
cpgsvp(0.1,0.95,0.0,0.18);
cpgswin(0.0,1.0,-0.5,0.5);
// Buttons
cpgtext(0.12,-0.05,"Inclination");
cpgtext(0.372,-0.05,"Eccentricity");
cpgtext(0.62,-0.05,"Mean Anomaly");
cpgtext(0.87,-0.05,"B\\u*\\d");
cpgtext(0.12,-0.3,"Ascending Node");
cpgtext(0.37,-0.3,"Arg. of Perigee");
cpgtext(0.62,-0.3,"Mean Motion");
// Toggles
for (i=0;i<7;i++) {
cpgpt1(dx[i],dy[i],19);
if (ia[i]==1) {
cpgsci(2);
cpgpt1(dx[i],dy[i],16);
cpgsci(1);
}
}
// Plot map
cpgsvp(0.1,0.9,0.2,0.9);
cpgswin(xmax,xmin,ymin,ymax);
cpgbox("BCTSN",0.,0,"BCTSN",0.,0);
cpglab("Right Ascension","Declination"," ");
if (satno>0) {
// Plot tle
format_tle(orb,line1,line2);
cpgmtxt("T",2.0,0.0,0.0,line1);
cpgmtxt("T",1.0,0.0,0.0,line2);
}
// Plot points
for (i=0;i<d.n;i++) {
if (d.p[i].flag>=1) {
cpgpt1(d.p[i].ra,d.p[i].de,17);
sprintf(text," %d",i+1);
cpgtext(d.p[i].ra,d.p[i].de,text);
if (plot_residuals==1) {
cpgmove(d.p[i].ra,d.p[i].de);
cpgdraw(d.p[i].rac,d.p[i].dec);
}
if (d.p[i].flag==2) {
cpgsci(2);
cpgpt1(d.p[i].ra,d.p[i].de,4);
cpgsci(1);
}
}
}
}
// Quit
if (quit==1)
break;
// Get cursor
cpgband(mode,posn,x0,y0,&x,&y,&c);
// Help
if (c=='h' || c=='?') {
printf("q Quit\nw Write TLE file\nP Search mean motion space\nf Fit orbit\ns Select observations in current window\nu Unselect observations\n1-7 Toggle parameter\nC Fit circular orbit\nS Search mean motion/eccentricity space\nc Change a parameter\nz Zoom\nr Unzoom\nt Toggle starting orbits (LEO, GTO, GEO, HEO)\n");
}
// Quit
if (c=='q' || c=='Q')
break;
// Period search
if (c=='P') {
period_search();
}
// Fit
if (c=='f') {
// Count points
for (i=0,nobs=0;i<d.n;i++)
if (d.p[i].flag==2)
nobs++;
if (satno<0) {
printf("No elements loaded!\n");
} else if (nobs==0) {
printf("No points selected!\n");
} else {
fit(orb,ia);
printf("%d %.5f\n",nobs,d.rms);
plot_residuals=1;
redraw=1;
continue;
}
}
// Write TLE
if (c=='w') {
printf("TLE filename to write: ");
scanf("%s",filename);
print_tle(orb,filename);
printf("\n================================================================================\n");
continue;
}
// Highlight
if (c=='s') {
highlight(xmin,ymin,xmax,ymax,2);
time_range(&mjdmin,&mjdmax,2);
for (i=0,nobs=0;i<d.n;i++)
if (d.p[i].flag==2)
nobs++;
click=0;
mode=0;
redraw=1;
continue;
}
// Unselect
if (c=='U') {
for (i=0;i<d.n;i++)
d.p[i].flag=1;
time_range(&mjdmin,&mjdmax,1);
redraw=1;
continue;
}
// Unselect
if (c=='u') {
for (i=0;i<d.n;i++)
if (d.p[i].flag==2)
d.p[i].flag=1;
redraw=1;
continue;
}
// Toggles
if (isdigit(c) && c-'0'>=1 && c-'0'<8) {
if (ia[c-49]==0)
ia[c-49]=1;
else if (ia[c-49]==1)
ia[c-49]=0;
redraw=1;
continue;
}
// Circular fit
if (c=='C') {
satno=circular_fit();
plot_residuals=1;
printf("%.3f\n",d.rms);
ia[0]=ia[1]=ia[4]=ia[5]=1;
redraw=1;
}
// Search
if (c=='S') {
satno=psearch();
plot_residuals=1;
ia[0]=ia[1]=ia[4]=ia[5]=1;
redraw=1;
}
// Search
if (c=='R') {
satno=revsearch();
plot_residuals=1;
// ia[0]=ia[1]=ia[4]=ia[5]=ia[2]=1;
redraw=1;
}
// EW search
if (c=='e') {
satno=ewsearch();
plot_residuals=1;
redraw=1;
}
// Change
if (c=='c') {
printf("(1) Inclination, (2) Ascending Node, (3) Eccentricity,\n(4) Arg. of Perigee, (5) Mean Anomaly, (6) Mean Motion,\n(7) B* drag, (8) Epoch, (9) Satellite ID\n(0) Sat ID\nWhich parameter to change: ");
scanf("%i",&i);
if (i>=0 && i<=9) {
printf("\nNew value: ");
fgets(string,64,stdin);
scanf("%s",string);
if (i==0) strcpy(orb.desig,string);
if (i==1) orb.eqinc=RAD(atof(string));
if (i==2) orb.ascn=RAD(atof(string));
if (i==3) orb.ecc=atof(string);
if (i==4) orb.argp=RAD(atof(string));
if (i==5) orb.mnan=RAD(atof(string));
if (i==6) orb.rev=atof(string);
if (i==7) orb.bstar=atof(string);
if (i==8) {
orb.ep_year=2000+(int) floor(atof(string)/1000.0);
orb.ep_day=atof(string)-1000*floor(atof(string)/1000.0);
}
if (i==9) orb.satno=atoi(string);
redraw=1;
continue;
}
printf("\n================================================================================\n");
}
// Zoom
if (c=='z') {
click=1;
mode=2;
}
// Execute zoom, or box delete
if (c=='A') {
if (click==0) {
click=1;
} else if (click==1 && mode==2) {
xmin=(x0<x) ? x0 : x;
xmax=(x0>x) ? x0 : x;
ymin=(y0<y) ? y0 : y;
ymax=(y0>y) ? y0 : y;
click=0;
mode=0;
redraw=1;
continue;
} else {
click=0;
mode=0;
redraw=1;
continue;
}
}
// Unzoom
if (c=='r') {
xmin=0.0;
xmax=360.0;
ymin=-90.0;
ymax=90.0;
mode=0;
click=0;
redraw=1;
continue;
}
// Default tle
if (c=='t') {
orb.satno=d.p[0].satno;
strcpy(orb.desig,d.p[0].desig);
orb.ep_day=mjd2doy(0.5*(mjdmin+mjdmax),&orb.ep_year);
satno=orb.satno;
if (elset==0) {
orb.eqinc=0.5*M_PI;
orb.ascn=0.0;
orb.ecc=0.0001;
orb.argp=0.0;
orb.mnan=0.0;
orb.rev=14.0;
orb.bstar=0.5e-4;
printf("LEO orbit\n");
} else if (elset==1) {
orb.eqinc=20.0*D2R;
orb.ascn=0.0;
orb.ecc=0.7;
orb.argp=0.0;
orb.mnan=0.0;
orb.rev=2.25;
orb.bstar=0.0;
printf("GTO orbit\n");
} else if (elset==2) {
orb.eqinc=10.0*D2R;
orb.ascn=0.0;
orb.ecc=0.0001;
orb.argp=0.0;
orb.mnan=0.0;
orb.rev=1.0027;
orb.bstar=0.0;
printf("GSO orbit\n");
} else if (elset==3) {
orb.eqinc=63.434*D2R;
orb.ascn=0.0;
orb.ecc=0.71;
orb.argp=270*D2R;
orb.mnan=0.0;
orb.rev=2.006;
orb.bstar=0.0;
printf("HEO orbit\n");
}
elset++;
if (elset>3)
elset=0;