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rffit.c
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rffit.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include <cpgplot.h>
#include <getopt.h>
#include "sgdp4h.h"
#define LIM 80
#define NMAX 1024
#define D2R M_PI/180.0
#define R2D 180.0/M_PI
#define XKMPER 6378.137 // km
#define KG 0.07436680 // earth radii, earth masses, minutes
#define C 299792.458 // km/s
#define FLAT (1.0/298.257)
struct site {
int id;
double lat,lng;
float alt;
char observer[64];
} site;
struct point {
char timestamp[24];
double mjd,freq,v,freq0;
float t,f,res;
float flux;
int flag,site_id,rsite_id;
struct site s,r;
};
struct data {
int n;
struct point *p;
int fitfreq;
double mjdmin,mjdmax,mjd0;
double freqmin,freqmax,fluxmin,fluxmax,f0,ffit;
char satname[LIM];
} d;
orbit_t orb;
int fgetline(FILE *file,char *s,int lim);
struct data read_data(char *filename,int graves,float offset);
double date2mjd(int year,int month,double day);
void mjd2nfd(double mjd,char *nfd);
struct point decode_line(char *line);
double modulo(double,double);
double gmst(double);
double dgmst(double);
void obspos_xyz(double,struct site,xyz_t *,xyz_t *);
int velocity(orbit_t orb,double mjd,struct site s,double *v,double *azi,double *alt);
double altitude(orbit_t orb,double mjd,struct site s);
void deselect_inside(float x0,float y0,float x,float y);
void highlight(float x0,float y0,float x,float y,int flag);
void deselect_outside(float xmin,float ymin,float xmax,float ymax);
void deselect_nearest(float x,float y,float xmin,float ymin,float xmax,float ymax);
void save_data(float xmin,float ymin,float xmax,float ymax,char *filename);
void equatorial2horizontal(double mjd,struct site s,double ra,double de,double *azi,double *alt);
double chisq(double a[]);
void versafit(int m,int n,double *a,double *da,double (*func)(double *),double dchisq,double tol,char *opt);
double compute_rms(void);
void mjd2date(double mjd,int *year,int *month,double *day);
void print_tle(orbit_t orb,char *filename);
void search(void);
double fit_curve(orbit_t orb,int *ia);
double mjd2doy(double mjd,int *yr);
double doy2mjd(int year,double doy);
int identify_satellite_from_visibility(char *catalog,double altmin);
// Get observing site
struct site get_site(int site_id)
{
int i=0,status;
char line[LIM];
FILE *file;
int id;
double lat,lng;
float alt;
char abbrev[3],observer[64];
struct site s;
char *env,filename[LIM];
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");
exit(0);
}
while (fgets(line,LIM,file)!=NULL) {
// Skip
if (strstr(line,"#")!=NULL)
continue;
// Strip newline
line[strlen(line)-1]='\0';
// Read data
status=sscanf(line,"%4d %2s %lf %lf %f",
&id,abbrev,&lat,&lng,&alt);
strcpy(observer,line+38);
// Change to km
alt/=1000.0;
// Copy site
if (id==site_id) {
s.lat=lat;
s.lng=lng;
s.alt=alt;
s.id=id;
strcpy(s.observer,observer);
}
}
fclose(file);
return s;
}
// Select diagonal
void diagonal_select(float x0,float y0,float x1,float y1,int flag)
{
int i;
float v;
float ymin,ymax;
printf("%f %f %f %f\n",x0,y0,x1,y1);
for (i=0;i<d.n;i++) {
v=(d.p[i].t-x0)/(x1-x0);
ymin=y0+v*(y1-y0)-3.0;
ymax=y0+v*(y1-y0)+3.0;
if (v>0.0 && v<1.0 && d.p[i].f>ymin && d.p[i].f<ymax && d.p[i].flag!=0)
d.p[i].flag=flag;
}
return;
}
void format_tle(orbit_t orb,char *line1,char *line2)
{
int i,csum;
char sbstar[]=" 00000-0",bstar[13];
// Format Bstar term
if (fabs(orb.bstar)>1e-9) {
sprintf(bstar,"%11.4e",10*orb.bstar);
sbstar[0] = bstar[0]; sbstar[1] = bstar[1]; sbstar[2] = bstar[3]; sbstar[3] = bstar[4];
sbstar[4] = bstar[5]; sbstar[5] = bstar[6]; sbstar[6] = bstar[8]; sbstar[7] = bstar[10]; sbstar[8] = '\0';
}
// Print lines
sprintf(line1,"1 %05dU %2d%012.8f .00000000 00000-0 %8s 0 0",orb.satno,orb.ep_year-2000,orb.ep_day,sbstar);
sprintf(line2,"2 %05d %8.4f %8.4f %07.0f %8.4f %8.4f %11.8f 0",orb.satno,DEG(orb.eqinc),DEG(orb.ascn),1E7*orb.ecc,DEG(orb.argp),DEG(orb.mnan),orb.rev);
// Compute checksums
for (i=0,csum=0;i<strlen(line1);i++) {
if (isdigit(line1[i]))
csum+=line1[i]-'0';
else if (line1[i]=='-')
csum++;
}
sprintf(line1,"%s%d",line1,csum%10);
for (i=0,csum=0;i<strlen(line2);i++) {
if (isdigit(line2[i]))
csum+=line2[i]-'0';
else if (line2[i]=='-')
csum++;
}
sprintf(line2,"%s%d",line2,csum%10);
return;
}
int identify_satellite_from_doppler(char *catalog,double rmsmax)
{
int i=0,flag=0;
FILE *fp;
double rms,rmsmin;
int ia[]={0,0,0,0,0,0};
int satno=0,imode;
double v,alt,azi,mjdmid;
// Open catalog
fp=fopen(catalog,"rb");
if (fp==NULL)
fatal_error("File open failed for reading %s\n",catalog);
// Loop over TLEs
while (read_twoline(fp,0,&orb)==0) {
// Initialize
imode=init_sgdp4(&orb);
if (imode==SGDP4_ERROR)
printf("Error\n");
// velocity(orb,d.p[d.n/2].mjd,d.p[d.n/2].s,&v,&azi,&alt);
// if (alt<0.0)
// printf("Continue?\n");
// continue;
rms=fit_curve(orb,ia);
if (flag==0 || rms<rmsmin) {
rmsmin=rms;
satno=orb.satno;
flag=1;
}
if (rms<rmsmax) {
printf("%05d %.3f kHz %.6f MHz\n",orb.satno,rms,d.ffit/1000.0);
i++;
}
}
rewind(fp);
// Plot results
if (i>0) {
printf("Identified %d candidate(s), best fitting satellite is %05d.\n",i,satno);
read_twoline(fp,satno,&orb);
rms=fit_curve(orb,ia);
} else {
printf("No candidates found.\n");
satno=-1;
}
fclose(fp);
return satno;
}
int identify_satellite_from_visibility(char *catalog,double altmin)
{
int i=0,flag=0,nalt,nsel;
FILE *fp;
int satno=0,imode;
double alt,frac;
// Open catalog
fp=fopen(catalog,"rb");
if (fp==NULL)
fatal_error("File open failed for reading %s\n",catalog);
// Loop over TLEs
while (read_twoline(fp,0,&orb)==0) {
// Initialize
imode=init_sgdp4(&orb);
if (imode==SGDP4_ERROR)
printf("Error\n");
if (orb.rev<10.0)
continue;
// Loop over observations
for (i=0,nalt=0,nsel=0;i<d.n;i++) {
if (d.p[i].flag==2) {
alt=altitude(orb,d.p[i].mjd,d.p[i].s);
nsel++;
if (alt>altmin)
nalt++;
}
}
frac=(float) nalt/(float) nsel;
if (nsel==nalt)
printf("%5d %d/%d %.4f\n",orb.satno,nalt,nsel,frac);
}
rewind(fp);
fclose(fp);
return satno;
}
void usage()
{
printf("dpplot -d <data file> -c [tle catalog] -i [satno] -h\n\ndata file: Tabulated doppler curve\ntle catalog: Catalog with TLE's (optional)\nsatno: Satellite to load from TLE catalog (optional)\n\n");
printf("rffit: fit RF observations\n\n");
printf("-d <datafile> Input data file with RF measurements\n");
printf("-c <catalog> Catalog with TLE's [optional]\n");
printf("-i <satno> NORAD ID of satellite to load\n");
printf("-s <site> Site ID\n");
printf("-g GRAVES data\n");
printf("-m <offset> Frequency offset to apply [Hz]\n");
printf("-h This help\n");
return;
}
int main(int argc,char *argv[])
{
int i,j,flag,redraw=1,plot_curve=1,plot_type=1,residuals=0,elset=0;
int imode,year,style,color;
char xlabel[64],ylabel[32],text[64],freqlist[128];
int site_id=4171;
float xmin,xmax,ymin,ymax;
float xminsel,xmaxsel,yminsel,ymaxsel;
float x0,y0,x,y;
double mjd,v,v1,azi,alt,rms=0.0,day,mjdtca=56658.0,altmin=0.0;
float t,f,vtca,foffset=0.0;
char c,nfd[32]="2014-01-01T00:00:00";
int mode=0,posn=0,click=0;
char *catalog,*datafile,filename[64],string[64],bstar[10]=" 00000-0";
int arg=0,nobs=0;
FILE *fp,*std,*fpres;
char line0[72],line1[72],line2[72];
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};
int satno=-1,status;
struct site s0,s1;
int site_number[16],nsite=0,graves=0;
char *env;
// Get site
env=getenv("ST_COSPAR");
if (env!=NULL) {
site_id=atoi(env);
} else {
printf("ST_COSPAR environment variable not found.\n");
}
env=getenv("ST_DATADIR");
// Decode options
while ((arg=getopt(argc,argv,"d:c:i:hs:gm:"))!=-1) {
switch(arg) {
case 'd':
datafile=optarg;
break;
case 'c':
catalog=optarg;
break;
case 'i':
satno=atoi(optarg);
break;
case 'h':
usage();
return 0;
break;
case 'm':
foffset=atof(optarg)/1000.0;
break;
case 's':
site_id=atoi(optarg);
break;
case 'g':
graves=1;
break;
default:
usage();
return 0;
}
}
// Read data
d=read_data(datafile,graves,foffset);
d.fitfreq=1;
// Set graves frequency
if (graves==1) {
d.fitfreq=0;
d.ffit=143050.0;
}
// Count number of sites and assign colors
for (i=0;i<d.n;i++) {
// Check if site is assigned
for (j=0,flag=0;j<nsite;j++)
if (site_number[j]==d.p[i].site_id)
flag=1;
// Not assigned
if (flag==0) {
site_number[nsite]=d.p[i].site_id;
nsite++;
}
if (nsite>=16) {
printf("Too many observing sites.\n");
return 0;
}
}
// Set default observing site
site=get_site(site_id);
// Read TLE
if (satno>=0) {
fp=fopen(catalog,"rb");
if (fp==NULL)
fatal_error("File open failed for reading %s\n",catalog);
status=read_twoline(fp,satno,&orb);
if (status==-1) {
printf("No elements found for %5d\n",satno);
satno=-1;
}
fclose(fp);
}
if (freopen("/tmp/stderr.txt","w",stderr)==NULL)
fprintf(stderr,"Failed to redirect stderr\n");
cpgopen("/xs");
cpgask(0);
xmin=d.mjdmin-d.mjd0-0.005;
xmax=d.mjdmax-d.mjd0+0.005;
if (graves==0) {
ymin=-12.0*d.f0/C;
ymax=12*d.f0/C;
} else if (graves==1) {
ymin=-20.0*d.f0/C;
ymax=20*d.f0/C;
}
// ymin=d.freqmin;
// ymax=d.freqmax;
day=mjd2doy(d.mjd0,&year);
sprintf(xlabel,"MJD - %5.0f (%02d%03.0f)",d.mjd0,year-2000,floor(day));
sprintf(ylabel,"Frequency - %.0f kHz",d.f0);
// For ever loop
for (;;) {
if (redraw==1) {
// Plot buttons
cpgpage();
cpgsvp(0.1,0.95,0.0,0.2);
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);
}
}
// Sky plot
cpgsvp(0.715,0.95,0.5,0.99);
cpgwnad(-90.0,90.0,-90.0,90.0);
cpgbox("BC",0.,0,"BC",0.,0);
cpgsfs(2);
cpgcirc(0.0,0.0,90.0);
cpgpt1(0.0,0.0,2);
// Plot orbit
if (satno>0 && plot_curve==1) {
// Initialize
imode=init_sgdp4(&orb);
if (imode==SGDP4_ERROR)
break;
cpgsci(15);
// for (mjd=d.mjd0,i=0;mjd<d.mjd0+xmax;mjd+=1.0/1440.0,i++) {
for (i=0;i<NMAX;i++) {
mjd=xmin+d.mjd0+(xmax-xmin)*(float) i/(float) (NMAX-1);
velocity(orb,mjd,site,&v,&azi,&alt);
// Get TCA
if (i>0) {
if (vtca*v<0.0) {
mjdtca=mjd;
}
}
x=(90-alt)*sin(azi*D2R);
y=-(90-alt)*cos(azi*D2R);
if (i==0 || alt<0.0)
cpgmove(x,y);
else
cpgdraw(x,y);
vtca=v;
}
mjd2nfd(mjdtca,nfd);
cpgsci(1);
cpgsls(1);
// Plot points
for (i=0;i<d.n;i++) {
velocity(orb,d.p[i].mjd,site,&v,&azi,&alt);
x=(90-alt)*sin(azi*D2R);
y=-(90-alt)*cos(azi*D2R);
if (alt<0.0)
continue;
if (d.p[i].flag==1) {
cpgsci(1);
if (d.p[i].rsite_id==0)
cpgpt1(x,y,17);
else
cpgpt1(x,y,2);
} else if (d.p[i].flag==2) {
cpgsci(1);
if (d.p[i].rsite_id==0)
cpgpt1(x,y,17);
else
cpgpt1(x,y,2);
cpgsci(2);
cpgpt1(x,y,4);
}
}
cpgsci(1);
}
// Diagnostics
cpgsvp(0.715,0.95,0.2,0.5);
cpgwnad(0.0,1.0,0.0,1.0);
sprintf(text,"Measurements: %d",nobs);
cpgtext(0.0,1.0,text);
sprintf(text,"Frequency: %.3f MHz",d.ffit/1000.0);
cpgtext(0.0,0.85,text);
sprintf(text,"rms: %.3f kHz",rms);
cpgtext(0.0,0.7,text);
sprintf(text,"TCA: %s",nfd);
cpgtext(0.0,0.55,text);
sprintf(text,"%s (%04d)",site.observer,site.id);
cpgtext(0.0,0.4,text);
// Plot site numbers
for (j=0;j<nsite;j++) {
sprintf(text,"%04d",site_number[j]);
cpgsci(j+2);
if (j<5)
cpgtext(0.25*j,0.25,text);
else if (j<10)
cpgtext(0.25*(j-5),0.15,text);
else if (j<15)
cpgtext(0.25*(j-10),0.05,text);
}
cpgsci(1);
// Initialize
cpgsvp(0.1,0.65,0.2,0.9);
cpgswin(xmin,xmax,ymin/d.f0*C,ymax/d.f0*C);
cpgbox("",0.,0,"CTSM",0.,0);
cpgmtxt("R",2.5,0.5,0.5,"Velocity (km/s)");
cpgswin(xmin,xmax,ymin,ymax);
cpgbox("BCTSN",0.,0,"BTSN",0.,0);
// cpgenv(xmin,xmax,ymin,ymax,0,0);
cpglab(xlabel,ylabel,"");
// Plot orbit
if (satno>0 && plot_curve==1 && residuals==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);
// Initialize
imode=init_sgdp4(&orb);
if (imode==SGDP4_ERROR)
break;
// Loop over sites for plotting model
for (j=0;j<nsite;j++) {
s0=get_site(site_number[j]);
s1=get_site(d.p[0].rsite_id);
color=j+2;
for (i=0;i<NMAX;i++) {
mjd=xmin+d.mjd0+(xmax-xmin)*(float) i/(float) (NMAX-1);
t=(float) (mjd-d.mjd0);
if (d.p[0].rsite_id!=0) {
velocity(orb,mjd,s1,&v1,&azi,&alt);
velocity(orb,mjd,s0,&v,&azi,&alt);
f=(float) ((1.0-v/C)*(1.0-v1/C)*d.ffit-d.f0);
} else {
velocity(orb,mjd,s0,&v,&azi,&alt);
f=(float) ((1.0-v/C)*d.ffit-d.f0);
}
if (alt>0.0) {
cpgsls(1);
cpgsci(color);
} else {
cpgsls(2);
cpgsci(14);
}
if (i==0)
cpgmove(t,f);
else
cpgdraw(t,f);
}
cpgsci(1);
cpgsls(1);
}
}
// Plot selected points
for (i=0;i<d.n;i++) {
for (j=0;j<nsite;j++)
if (d.p[i].site_id==site_number[j])
break;
color=j+2;
style=17;
x=d.p[i].t;
y=d.p[i].f;
if (d.p[i].flag==1) {
cpgsci(color);
if (d.p[i].rsite_id==0)
cpgpt1(x,y,style);
else
cpgpt1(x,y,2);
} else if (d.p[i].flag==2) {
cpgsci(color);
if (d.p[i].rsite_id==0)
cpgpt1(x,y,style);
else
cpgpt1(x,y,2);
cpgsci(1);
cpgpt1(x,y,4);
}
}
cpgsci(1);
redraw=0;
}
// Get cursor
cpgband(mode,posn,x0,y0,&x,&y,&c);
// Quit
if (c=='q' || c=='Q')
break;
// Toggle curve
if (c=='p') {
plot_curve=(plot_curve==1) ? 0 : 1;
redraw=1;
}
// 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;
}
// 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\nWhich parameter to change: ");
status=scanf("%i",&i);
if (i>=0 && i<=9) {
printf("\nNew value: ");
if (fgets(string,64,stdin)==NULL)
fprintf(stderr,"Failed to read string\n");
status=scanf("%s",string);
// if (i==0) strcpy(d.satname,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);
if (i==0) {
printf("%f\n",d.ffit);
d.ffit=atof(string);
d.fitfreq=0;
}
redraw=1;
}
printf("\n================================================================================\n");
}
// Move
if (c=='m') {
printf("Provide frequency offset (kHz): ");
status=scanf("%lf",&v);
// Loop over points
for (i=0;i<d.n;i++) {
if (d.p[i].flag==2) {
d.p[i].f+=v;
d.p[i].freq+=v;
}
}
click=0;
redraw=1;
printf("\n================================================================================\n");
continue;
}
// Flux limit
if (c=='l') {
env=getenv("ST_DATADIR");
sprintf(freqlist,"%s/data/frequencies.txt",env);
fp=fopen(freqlist,"a");
fprintf(fp,"%05d %lf\n",orb.satno,d.ffit/1000.0);
fclose(fp);
printf("Logged %05d at %lf to %s\n",orb.satno,d.ffit/1000.0,freqlist);
printf("\n================================================================================\n");
}
// 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 {
rms=fit_curve(orb,ia);
//printf("rms: %.3f kHz, cf: %.6f MHz, TCA: %s\n",rms,d.ffit/1000.0,nfd);
printf("%05d %.3f %.3f %s %04d %02d%010.6f\n",orb.satno,d.ffit/1000.0,rms,nfd,d.p[0].site_id,orb.ep_year-2000,orb.ep_day);
redraw=1;
}
}
// Get TLE
if (c=='g') {
printf("Get TLE from catalog, provide satellite number: ");
status=scanf("%d",&satno);
// Read TLE
fp=fopen(catalog,"rb");
if (fp==NULL)
fatal_error("File open failed for reading %s\n",catalog);
status=read_twoline(fp,satno,&orb);
fclose(fp);
if (status==-1) {
printf("No elements found for %5d\n",satno);
satno=-1;
} else {
print_orb(&orb);
d.ffit=d.f0;
redraw=1;
}
printf("\n================================================================================\n");
}
// Identify
if (c=='i') {
if (graves==0) {
printf("rms limit (kHz): ");
status=scanf("%lf",&rms);
} else {
printf("Using 0.1 kHz rms limit\n");
rms=0.1;
}
satno=identify_satellite_from_doppler(catalog,rms);
if (satno>0) {
redraw=1;
plot_curve=1;
}
printf("\n================================================================================\n");
}
// Identify
if (c=='I') {
printf("Above altitude (deg): ");
status=scanf("%lf",&altmin);
satno=identify_satellite_from_visibility(catalog,altmin);
printf("\n================================================================================\n");
}
// Parameter search
// if (c=='S') {
// search();
// redraw=1;
// }
// Write TLE
if (c=='w') {
printf("TLE filename to write: ");
status=scanf("%s",filename);
print_tle(orb,filename);
printf("\n================================================================================\n");
}
// Reread tle
if (c=='R') {
// Read TLE
fp=fopen(catalog,"rb");
if (fp==NULL)
fatal_error("File open failed for reading %s\n",catalog);
read_twoline(fp,satno,&orb);
print_orb(&orb);
printf("\n================================================================================\n");
fclose(fp);
d.ffit=d.f0;
redraw=1;
}
// Diagonal select
if (c=='k') {
printf("Selecting diagonal\n");
diagonal_select(xmin,ymin,xmax,ymax,2);
redraw=1;
}
// Toggle residuals
if (c=='j') {
fpres=fopen("residuals.dat","w");
for (i=0;i<d.n;i++)
fprintf(fpres,"%14.8lf %lf %lf\n",d.p[i].mjd,d.p[i].freq,d.p[i].res);
fclose(fpres);
if (residuals==0)
residuals=1;
else if (residuals==1)
residuals=0;
redraw=1;
}
// Delete
if (c=='X') {
if (click==0) {
deselect_nearest(x,y,xmin,ymin,xmax,ymax);
click=0;
redraw=1;
}
}
// Zoom
if (c=='z') {
click=1;
mode=2;
}
// Delete box
if (c=='d') {
click=2;
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;
} else if (click==2 && mode==2) {
xminsel=(x0<x) ? x0 : x;
xmaxsel=(x0>x) ? x0 : x;
yminsel=(y0<y) ? y0 : y;
ymaxsel=(y0>y) ? y0 : y;
deselect_inside(xminsel,yminsel,xmaxsel,ymaxsel);
click=0;
mode=0;
redraw=1;
} else if (click==3 && mode==2) {
xminsel=(x0<x) ? x0 : x;
xmaxsel=(x0>x) ? x0 : x;
yminsel=(y0<y) ? y0 : y;
ymaxsel=(y0>y) ? y0 : y;
printf("%f %f %f %f\n",xminsel,xmaxsel,yminsel,ymaxsel);
click=0;
mode=0;
redraw=1;
} else {
click=0;
mode=0;
redraw=1;
}
}
// Highlight
if (c=='s') {
highlight(xmin,ymin,xmax,ymax,2);
for (i=0,nobs=0;i<d.n;i++)
if (d.p[i].flag==2)
nobs++;
click=0;
mode=0;
redraw=1;
}
// Highlight
if (c=='H') {
highlight(xmin,ymin,xmax,ymax,1);
click=0;
mode=0;
redraw=1;
}
// Deselect all except highlighted
if (c=='x') {
deselect_inside(xmin,ymin,xmax,ymax);
click=0;
mode=0;
redraw=1;
}
// Invert selection
if (c=='I') {
for (i=0;i<d.n;i++) {
if (d.p[i].flag==2)
d.p[i].flag=1;
else if (d.p[i].flag==1)
d.p[i].flag=2;
}
click=0;
redraw=1;
}
// Deselect highlighted
if (c=='D') {
for (i=0;i<d.n;i++) {
if (d.p[i].flag==2)
d.p[i].flag=0;
}
click=0;
mode=0;
redraw=1;
}
// Save
if (c=='S') {
printf("%s_%.3f_%04d_%05d.dat\n",nfd,d.ffit/1000.0,d.p[0].site_id,satno);
printf("Save highlighted points, provide filename: ");
status=scanf("%s",filename);
save_data(xmin,ymin,xmax,ymax,filename);
printf("\n================================================================================\n");
}
// Unselect
if (c=='U') {
for (i=0;i<d.n;i++)
d.p[i].flag=1;
redraw=1;
}
// Unselect
if (c=='u') {
for (i=0;i<d.n;i++)
if (d.p[i].flag==2)
d.p[i].flag=1;
redraw=1;
}
// Default tle
if (c=='t') {
orb.satno=99999;
strcpy(orb.desig,"13900A");
orb.ep_day=mjd2doy(0.5*(d.mjdmin+d.mjdmax),&orb.ep_year);
satno=orb.satno;
if (elset==0) {
orb.eqinc=0.5*M_PI;
orb.ascn=modulo(gmst(0.5*(d.mjdmin+d.mjdmax))+site.lng,360.0)*D2R;
orb.ecc=0.0001;
orb.argp=0.0;
orb.mnan=site.lat*D2R;
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=0.0;
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=270.0*D2R;