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B"H decoding: use last air position to calculate ground position

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hhm 2014-07-14 04:03:07 -04:00
parent 60e2c92c05
commit d1b37ad1c5
1 changed files with 18 additions and 6 deletions
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24
mode_s.c
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@ -2022,12 +2022,24 @@ void decodeCPR(struct aircraft *a, int fflag, int surface) {
double rlat0 = AirDlat0 * (cprModFunction(j,60) + lat0 / 131072);
double rlat1 = AirDlat1 * (cprModFunction(j,59) + lat1 / 131072);
time_t now = time(NULL);
double surface_rlat = MODES_USER_LATITUDE_DFLT;
double surface_rlon = MODES_USER_LONGITUDE_DFLT;
if (surface) {
// If we're on the ground, make sure we have our receiver base station Lat/Lon
if (0 == (Modes.bUserFlags & MODES_USER_LATLON_VALID))
{return;}
rlat0 += floor(Modes.fUserLat / 90.0) * 90.0; // Move from 1st quadrant to our quadrant
rlat1 += floor(Modes.fUserLat / 90.0) * 90.0;
// If we're on the ground, make sure we have a (likely) valid Lat/Lon
if ((a->bFlags & MODES_ACFLAGS_LATLON_VALID) && (((int)(now - a->seenLatLon)) < Modes.interactive_display_ttl)) {
surface_rlat = a->lat;
surface_rlon = a->lon;
} else if (Modes.bUserFlags & MODES_USER_LATLON_VALID) {
surface_rlat = Modes.fUserLat;
surface_rlon = Modes.fUserLon;
} else {
surface_rlat = Modes.fUserLat;
return;
}
rlat0 += floor(surface_rlat / 90.0) * 90.0; // Move from 1st quadrant to our quadrant
rlat1 += floor(surface_rlat / 90.0) * 90.0;
} else {
if (rlat0 >= 270) rlat0 -= 360;
if (rlat1 >= 270) rlat1 -= 360;
@ -2052,7 +2064,7 @@ void decodeCPR(struct aircraft *a, int fflag, int surface) {
}
if (surface) {
a->lon += floor(Modes.fUserLon / 90.0) * 90.0; // Move from 1st quadrant to our quadrant
a->lon += floor(surface_rlon / 90.0) * 90.0; // Move from 1st quadrant to our quadrant
} else if (a->lon > 180) {
a->lon -= 360;
}