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Numerical robustness for the GPS code, when dt or last_speed_kts is zero.

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jmt 2009-10-06 20:50:15 +00:00 • committed by Tim Moore
parent 696007e503
commit 72d9c254f4
1 changed files with 22 additions and 8 deletions
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30
src/Instrumentation/gps.cxx
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@ -557,7 +557,7 @@ GPS::updateBasicData(double dt)
speed_kt = fgGetLowPass(_last_speed_kts, speed_kt, dt/20.0);
_last_speed_kts = speed_kt;
double odometer = _odometer_node->getDoubleValue();
_odometer_node->setDoubleValue(odometer + distance_m * SG_METER_TO_NM);
odometer = _trip_odometer_node->getDoubleValue();
@ -918,8 +918,10 @@ void GPS::updateRouteData()
}
_routeDistanceNm->setDoubleValue(totalDistance * SG_METER_TO_NM);
double TTW = ((totalDistance * SG_METER_TO_NM) / _last_speed_kts) * 3600.0;
_routeETE->setStringValue(makeTTWString(TTW));
if (_last_speed_kts > 1.0) {
double TTW = ((totalDistance * SG_METER_TO_NM) / _last_speed_kts) * 3600.0;
_routeETE->setStringValue(makeTTWString(TTW));
}
}
/////////////////////////////////////////////////////////////////////////////
@ -927,7 +929,7 @@ void GPS::updateRouteData()
double GPS::getLegDistance() const
{
if (_mode == "obs") {
if (!_last_valid || (_mode == "obs")) {
return -1;
}
@ -936,7 +938,7 @@ double GPS::getLegDistance() const
double GPS::getLegCourse() const
{
if (_mode == "obs") {
if (!_last_valid || (_mode == "obs")) {
return -9999.0;
}
@ -1002,7 +1004,7 @@ double GPS::getCDIDeflection() const
const char* GPS::getWP0Ident() const
{
if (_mode != "leg") {
if (!_last_valid || (_mode != "leg")) {
return "";
}
@ -1011,7 +1013,7 @@ const char* GPS::getWP0Ident() const
const char* GPS::getWP0Name() const
{
if (_mode != "leg") {
if (!_last_valid || (_mode != "leg")) {
return "";
}
@ -1020,11 +1022,19 @@ const char* GPS::getWP0Name() const
const char* GPS::getWP1Ident() const
{
if (!_last_valid) {
return "";
}
return _wp1Ident.c_str();
}
const char* GPS::getWP1Name() const
{
if (!_last_valid) {
return "";
}
return _wp1Name.c_str();
}
@ -1043,7 +1053,7 @@ double GPS::getWP1TTW() const
return -1.0;
}
if (_last_speed_kts <= 0.0) {
if (_last_speed_kts < 1.0) {
return -1.0;
}
@ -1052,6 +1062,10 @@ double GPS::getWP1TTW() const
const char* GPS::getWP1TTWString() const
{
if (!_last_valid) {
return "";
}
return makeTTWString(getWP1TTW());
}