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GPS detects being repositioned

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Avoid screwing up the derived / trend data when we are repositioned;
detect instantaneous position changes and don’t update the trend
data in this case.
This commit is contained in:
James Turner 2019-09-20 23:08:22 +01:00
parent b9a4101f61
commit 15c101efe4
1 changed files with 8 additions and 0 deletions
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8
src/Instrumentation/gps.cxx
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@ -498,6 +498,14 @@ GPS::updateBasicData(double dt)
double track2_deg;
SGGeodesy::inverse(_last_pos, _indicated_pos, _last_true_track, track2_deg, distance_m );
// detect repositions
// setting this value high enough hypersonic aircraft but not spaceships
if ((distance_m / dt) > 100000.0) {
SG_LOG(SG_INSTR, SG_DEBUG, "GPS detected reposition, resetting data");
_dataValid = false;
return;
}
double speed_kt = ((distance_m * SG_METER_TO_NM) * ((1 / dt) * 3600.0));
double vertical_speed_mpm = ((_indicated_pos.getElevationM() - _last_pos.getElevationM()) * 60 / dt);
_last_vertical_speed = vertical_speed_mpm * SG_METER_TO_FEET;