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Updates [hack] from David Megginson so VOR reception range scales with

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altitude.
This commit is contained in:
curt 2000-05-30 16:49:44 +00:00
parent 0786793f42
commit 2e08c97204
2 changed files with 28 additions and 4 deletions
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30
src/Cockpit/radiostack.cxx
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@ -27,6 +27,30 @@
#include "radiostack.hxx"
/**
* Boy, this is ugly! Make the VOR range vary by altitude difference.
*/
static inline double
kludgeRange (double stationElev, double aircraftElev, double nominalRange)
{
// Assume that the nominal range (usually
// 50nm) applies at a 5,000 ft difference.
// Just a wild guess!
double factor = ((aircraftElev*METER_TO_FEET) - stationElev) / 5000.0;
double range = fabs(nominalRange * factor);
// Clamp the range to keep it sane; for
// now, never less than 25% or more than
// 500% of nominal range.
if (range < nominalRange/4.0) {
range = nominalRange/4.0;
} else if (range > nominalRange*5.0) {
range = nominalRange*5.0;
}
return range;
}
FGRadioStack *current_radiostack;
@ -205,7 +229,7 @@ void FGRadioStack::search( double lon, double lat, double elev ) {
nav1_loclon = nav.get_lon();
nav1_loclat = nav.get_lat();
nav1_elev = nav.get_elev();
nav1_effective_range = nav.get_range();
nav1_effective_range = kludgeRange(nav1_elev, elev, nav.get_range());
nav1_target_gs = 0.0;
nav1_radial = nav1_sel_radial;
nav1_x = nav1_dme_x = nav.get_x();
@ -251,7 +275,7 @@ void FGRadioStack::search( double lon, double lat, double elev ) {
nav2_loclon = nav.get_lon();
nav2_loclat = nav.get_lat();
nav2_elev = nav.get_elev();
nav2_effective_range = nav.get_range();
nav2_effective_range = kludgeRange(nav2_elev, elev, nav.get_range());
nav2_target_gs = 0.0;
nav2_radial = nav2_sel_radial;
nav2_x = nav2_dme_x = nav.get_x();
@ -271,7 +295,7 @@ void FGRadioStack::search( double lon, double lat, double elev ) {
adf_lon = nav.get_lon();
adf_lat = nav.get_lat();
adf_elev = nav.get_elev();
adf_effective_range = nav.get_range();
adf_effective_range = kludgeRange(adf_elev, elev, nav.get_range());
adf_x = nav.get_x();
adf_y = nav.get_y();
adf_z = nav.get_z();

2
src/Navaids/navlist.cxx
View file

@ -131,7 +131,7 @@ bool FGNavList::query( double lon, double lat, double elev, double freq,
// cout << " dist = " << sqrt(d)
// << " range = " << current->get_range() * NM_TO_METER << endl;
if ( d < (current->get_range() * NM_TO_METER
* current->get_range() * NM_TO_METER) ) {
* current->get_range() * NM_TO_METER * 5.0) ) {
// cout << "matched = " << current->get_ident() << endl;
*n = *current;
return true;