-
-double FGNavRadio::localizerWidth(FGNavRecord* aLOC)
-{
- FGRunway* rwy = aLOC->runway();
- if (!rwy) {
- return 6.0; // no runway associated, return default value
- }
-
-
- SGVec3d thresholdCart(SGVec3d::fromGeod(rwy->threshold()));
- double axisLength = dist(aLOC->cart(), thresholdCart);
- double landingLength = dist(thresholdCart, SGVec3d::fromGeod(rwy->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;
-}
-
-void FGNavRadio::audioNavidChanged()
-{
- if (_sgr->exists(nav_fx_name)) {
- _sgr->remove(nav_fx_name);
- }
-
- try {
- string trans_ident(_navaid->get_trans_ident());
- SGSoundSample* sound = morse.make_ident(trans_ident, LO_FREQUENCY);
- sound->set_volume( 0.3 );
- if (!_sgr->add( sound, nav_fx_name )) {
- SG_LOG(SG_COCKPIT, SG_WARN, "Failed to add v1-vor-ident sound");
- }
-
- if ( _sgr->exists( dme_fx_name ) ) {
- _sgr->remove( dme_fx_name );
- }
-
- sound = morse.make_ident( trans_ident, HI_FREQUENCY );
- sound->set_volume( 0.3 );
- _sgr->add( sound, dme_fx_name );
-
- int offset = (int)(sg_random() * 30.0);
- play_count = offset / 4;
- last_time = globals->get_time_params()->get_cur_time() - offset;
- } catch (sg_io_exception& e) {
- SG_LOG(SG_GENERAL, SG_ALERT, e.getFormattedMessage());
- }
-}