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reduce distance to 300 km

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This commit is contained in:
adrian 2011-09-05 09:46:19 +03:00
parent c69c91769e
commit 2c91f179d1
1 changed files with 16 additions and 12 deletions
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26
src/ATC/trafficcontrol.cxx
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@ -817,36 +817,37 @@ double FGATCController::calculate_attenuation(FGTrafficRecord * rec, FGAirportDy
double course = SGGeodesy::courseRad(own_pos_c, sender_pos_c);
double distance_m = SGGeodesy::distanceM(own_pos, sender_pos);
double probe_distance = 0.0;
// If distance larger than this value (300 km), assume reception imposssible
// technically 300 km is no problem if LOS conditions exist,
// but we do this to spare resources
if (distance_m > 300000)
return -1.0;
double max_points = distance_m / point_distance;
deque<double> _elevations;
//SGGeod probe_pilot = SGGeod::fromGeoc(center.advanceRadM( course, 0 ));
SGGeod probe_pilot = max_own_pos;
double elevation_under_pilot = 0.0;
if (scenery->get_elevation_m( probe_pilot, elevation_under_pilot, NULL )) {
if (scenery->get_elevation_m( max_own_pos, elevation_under_pilot, NULL )) {
receiver_height = own_alt - elevation_under_pilot + 3; //assume antenna located 3 meters above ground
}
//SGGeod probe_sender = SGGeod::fromGeoc(center.advanceRadM( course, distance_m ));
SGGeod probe_sender = max_sender_pos;
double elevation_under_sender = 0.0;
if (scenery->get_elevation_m( probe_sender, elevation_under_sender, NULL )) {
if (scenery->get_elevation_m( max_sender_pos, elevation_under_sender, NULL )) {
transmitter_height = sender_alt - elevation_under_sender;
}
else {
transmitter_height = sender_alt;
}
if(ground_to_air)
transmitter_height += ATC_HAAT;
else
transmitter_height += Aircraft_HAAT;
cerr << "ITM:: RCVhgt: " << receiver_height << ", TRXhgt: " << transmitter_height << ", Distance: " << distance_m << endl;
// If distance larger than this value (400 km), assume reception imposssible
// technically 400 km is no problem if LOS conditions exist,
// but we do this to spare resources
if (distance_m > 400000)
return -1.0;
unsigned int e_size = (deque<unsigned>::size_type)max_points;
@ -860,6 +861,9 @@ double FGATCController::calculate_attenuation(FGTrafficRecord * rec, FGAirportDy
_elevations.push_front(elevation_m);
//cerr << "ITM:: Probe elev: " << elevation_m << endl;
}
else {
_elevations.push_front(0.0);
}
}
_elevations.push_back(elevation_under_pilot);
_elevations.push_front(elevation_under_sender);