caiyu/gps-sdr-sim
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Time of ephemeris changes to fit our spoofer requirements. The ephemeris shall be valid for 4 hours, 2 hours ahead and 2 hours in the past

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bt-juanfandino1234 2021-05-26 16:30:45 +04:00
parent 399579f352
commit 9646ce72a8
1 changed files with 8 additions and 2 deletions
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10
gpssim.c
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@ -2009,7 +2009,11 @@ int main(int argc, char *argv[])
} }
else else
{ {
if (subGpsTime(g0, gmin)<0.0 || subGpsTime(gmax, g0)<0.0) // Deviation from original gpssim.c. This statement is checking that the current receiver local time is
// within a longer time interval given by two hours before the minimum ephemeris time and two hours after the
// maximum ephemeris time. In the original implementation, the check was that the current receiver local time
// is within the miminum time of ephemeris and the maximum time of ephemeris
if (fabs(subGpsTime(g0, gmin))>2*SECONDS_IN_HOUR && fabs(subGpsTime(gmax, g0))>2*SECONDS_IN_HOUR)
{ {
fprintf(stderr, "ERROR: Invalid start time.\n"); fprintf(stderr, "ERROR: Invalid start time.\n");
fprintf(stderr, "tmin = %4d/%02d/%02d,%02d:%02d:%02.0f (%d:%.0f)\n", fprintf(stderr, "tmin = %4d/%02d/%02d,%02d:%02d:%02.0f (%d:%.0f)\n",
@ -2042,7 +2046,9 @@ int main(int argc, char *argv[])
if (eph[i][sv].vflg == 1) if (eph[i][sv].vflg == 1)
{ {
dt = subGpsTime(g0, eph[i][sv].toc); dt = subGpsTime(g0, eph[i][sv].toc);
if (dt>=-SECONDS_IN_HOUR && dt<SECONDS_IN_HOUR) // Test that ephemeris can be used by comparing the receiver local time with the time of clock from ephemeris data and observing
// the receiver local time is within a 4 hour interval from the time of clock from ephemeris
if (dt>=-2*SECONDS_IN_HOUR && dt<2*SECONDS_IN_HOUR)
{ {
ieph = i; ieph = i;
break; break;