}
}
+ init(true); // init FGPositioned (now position is adjusted)
}
void FGNavRecord::initAirportRelation()
}
mRunway = getRunwayFromName(_name);
+ if (!mRunway) {
+ return;
+ }
if (type() != GS) {
readAirportSceneryData();
mPosition.setElevationFt(mRunway->elevation());
}
- if (type() == ILS) {
+ if (type() == ILS || type() == LOC) {
mRunway->setILS(this);
}
SGPropertyNode* runwayNode, *ilsNode;
for (int i=0; (runwayNode = rootNode->getChild("runway", i)) != NULL; ++i) {
for (int j=0; (ilsNode = runwayNode->getChild("ils", j)) != NULL; ++j) {
- if (ilsNode->getStringValue("nav-id") == ident()) {
+ // must match on both nav-ident and runway ident, to support the following:
+ // - runways with multiple distinct ILS installations (KEWD, for example)
+ // - runways where both ends share the same nav ident (LFAT, for example)
+ if ((ilsNode->getStringValue("nav-id") == ident()) &&
+ (ilsNode->getStringValue("rwy") == mRunway->ident())) {
processSceneryILS(ilsNode);
return;
}
void FGNavRecord::processSceneryILS(SGPropertyNode* aILSNode)
{
- assert(aILSNode->getStringValue("rwy") == mRunway->ident());
double hdgDeg = aILSNode->getDoubleValue("hdg-deg"),
lon = aILSNode->getDoubleValue("lon"),
lat = aILSNode->getDoubleValue("lat"),
void FGNavRecord::alignLocaliserWithRunway(double aThreshold)
{
// find the distance from the threshold to the localizer
- SGGeod runwayThreshold(mRunway->threshold());
- double dist, az1, az2;
- SGGeodesy::inverse(mPosition, runwayThreshold, az1, az2, dist);
+ double dist = SGGeodesy::distanceM(mPosition, mRunway->threshold());
// back project that distance along the runway center line
SGGeod newPos = mRunway->pointOnCenterline(dist);
SG_NORMALIZE_RANGE(hdg_diff, -180.0, 180.0);
if ( fabs(hdg_diff) <= aThreshold ) {
- mPosition = newPos;
+ mPosition = SGGeod::fromGeodFt(newPos, mPosition.getElevationFt());
set_multiuse( mRunway->headingDeg() );
} else {
- SG_LOG(SG_GENERAL, SG_WARN, "localizer:" << ident() << ", aligning with runway "
+ SG_LOG(SG_GENERAL, SG_DEBUG, "localizer:" << ident() << ", aligning with runway "
<< mRunway->ident() << " exceeded heading threshold");
}
}
+double FGNavRecord::localizerWidth() const
+{
+ if (!mRunway) {
+ return 6.0;
+ }
+
+ SGVec3d thresholdCart(SGVec3d::fromGeod(mRunway->threshold()));
+ double axisLength = dist(cart(), thresholdCart);
+ double landingLength = dist(thresholdCart, SGVec3d::fromGeod(mRunway->end()));
+
+// Reference: http://dcaa.slv.dk:8000/icaodocs/
+// ICAO standard width at threshold is 210 m = 689 feet = approx 700 feet.
+// ICAO 3.1.1 half course = DDM = 0.0775
+// ICAO 3.1.3.7.1 Sensitivity 0.00145 DDM/m at threshold
+// implies peg-to-peg of 214 m ... we will stick with 210.
+// ICAO 3.1.3.7.1 "Course sector angle shall not exceed 6 degrees."
+
+// Very short runway: less than 1200 m (4000 ft) landing length:
+ if (landingLength < 1200.0) {
+// ICAO fudges localizer sensitivity for very short runways.
+// This produces a non-monotonic sensitivity-versus length relation.
+ axisLength += 1050.0;
+ }
+
+// Example: very short: San Diego KMYF (Montgomery Field) ILS RWY 28R
+// Example: short: Tom's River KMJX (Robert J. Miller) ILS RWY 6
+// Example: very long: Denver KDEN (Denver) ILS RWY 16R
+ double raw_width = 210.0 / axisLength * SGD_RADIANS_TO_DEGREES;
+ return raw_width < 6.0? raw_width : 6.0;
+
+}
+
FGTACANRecord::FGTACANRecord(void) :
channel(""),
freq(0)