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Added comments to the time of ephemeris check statements

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bt-juanfandino1234 2021-05-26 16:04:50 +04:00
parent b80826d7e6
commit e497ad30ac
1 changed files with 6 additions and 0 deletions
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gpssim.c
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@ -2009,6 +2009,10 @@ int main(int argc, char *argv[])
}
else
{
// 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");
@ -2042,6 +2046,8 @@ int main(int argc, char *argv[])
if (eph[i][sv].vflg == 1)
{
dt = subGpsTime(g0, eph[i][sv].toc);
// 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;