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flightgear/src/Cockpit/radiostack.cxx
curt d116eb2a62 Fixes to vor/ils/adf range pickup.
2001-03-12 15:07:49 +00:00

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// radiostack.cxx -- class to manage an instance of the radio stack
//
// Written by Curtis Olson, started April 2000.
//
// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
#include <simgear/math/sg_random.h>
#include <Aircraft/aircraft.hxx>
#include <Main/bfi.hxx>
#include <Navaids/ilslist.hxx>
#include <Navaids/navlist.hxx>
#include <Time/event.hxx>
#include "radiostack.hxx"
static int nav1_play_count = 0;
static time_t nav1_last_time = 0;
/**
* 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) / 1000.0;
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;
// periodic radio station search wrapper
static void fgRadioSearch( void ) {
current_radiostack->search();
}
// Constructor
FGRadioStack::FGRadioStack() {
nav1_radial = 0.0;
nav1_dme_dist = 0.0;
nav2_radial = 0.0;
nav2_dme_dist = 0.0;
need_update = true;
longitudeVal = fgGetValue("/position/longitude");
latitudeVal = fgGetValue("/position/latitude");
altitudeVal = fgGetValue("/position/altitude");
}
// Destructor
FGRadioStack::~FGRadioStack()
{
unbind(); // FIXME: should be called externally
}
void
FGRadioStack::init ()
{
morse.init();
search();
update();
// Search radio database once per second
global_events.Register( "fgRadioSearch()", fgRadioSearch,
fgEVENT::FG_EVENT_READY, 1000);
}
void
FGRadioStack::bind ()
{
// User inputs
fgTie("/radios/nav1/frequencies/selected", this,
&FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
fgTie("/radios/nav1/frequencies/standby", this,
&FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
fgTie("/radios/nav1/radials/selected", this,
&FGRadioStack::get_nav1_sel_radial,
&FGRadioStack::set_nav1_sel_radial);
fgTie("/radios/nav1/on", this,
&FGRadioStack::get_nav1_on_btn,
&FGRadioStack::set_nav1_on_btn);
fgTie("/radios/nav1/ident", this,
&FGRadioStack::get_nav1_ident_btn,
&FGRadioStack::set_nav1_ident_btn);
// Radio outputs
fgTie("/radios/nav1/radials/actual", this, &FGRadioStack::get_nav1_radial);
fgTie("/radios/nav1/to-flag", this, &FGRadioStack::get_nav1_to_flag);
fgTie("/radios/nav1/from-flag", this, &FGRadioStack::get_nav1_from_flag);
fgTie("/radios/nav1/in-range", this, &FGRadioStack::get_nav1_inrange);
fgTie("/radios/nav1/dme/distance", this, &FGRadioStack::get_nav1_dme_dist);
fgTie("/radios/nav1/dme/in-range", this,
&FGRadioStack::get_nav1_dme_inrange);
fgTie("/radios/nav1/heading-needle-deflection", this,
&FGRadioStack::get_nav1_heading_needle_deflection);
fgTie("/radios/nav1/gs-needle-deflection", this,
&FGRadioStack::get_nav1_gs_needle_deflection);
// User inputs
fgTie("/radios/nav2/frequencies/selected", this,
&FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
fgTie("/radios/nav2/frequencies/standby", this,
&FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
fgTie("/radios/nav2/radials/selected", this,
&FGRadioStack::get_nav2_sel_radial,
&FGRadioStack::set_nav2_sel_radial);
fgTie("/radios/nav2/on", this,
&FGRadioStack::get_nav2_on_btn,
&FGRadioStack::set_nav2_on_btn);
fgTie("/radios/nav2/ident", this,
&FGRadioStack::get_nav2_ident_btn,
&FGRadioStack::set_nav2_ident_btn);
// Radio outputs
fgTie("/radios/nav2/radials/actual", this, &FGRadioStack::get_nav2_radial);
fgTie("/radios/nav2/to-flag", this, &FGRadioStack::get_nav2_to_flag);
fgTie("/radios/nav2/from-flag", this, &FGRadioStack::get_nav2_from_flag);
fgTie("/radios/nav2/in-range", this, &FGRadioStack::get_nav2_inrange);
fgTie("/radios/nav2/dme/distance", this, &FGRadioStack::get_nav2_dme_dist);
fgTie("/radios/nav2/dme/in-range", this,
&FGRadioStack::get_nav2_dme_inrange);
fgTie("/radios/nav2/heading-needle-deflection", this,
&FGRadioStack::get_nav2_heading_needle_deflection);
fgTie("/radios/nav2/gs-needle-deflection", this,
&FGRadioStack::get_nav2_gs_needle_deflection);
// User inputs
fgTie("/radios/adf/frequencies/selected", this,
&FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
fgTie("/radios/adf/frequencies/standby", this,
&FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
fgTie("/radios/adf/rotation", this,
&FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
}
void
FGRadioStack::unbind ()
{
fgUntie("/radios/nav1/frequencies/selected");
fgUntie("/radios/nav1/frequencies/standby");
fgUntie("/radios/nav1/radials/actual");
fgUntie("/radios/nav1/radials/selected");
fgUntie("/radios/nav1/on");
fgUntie("/radios/nav1/ident");
fgUntie("/radios/nav1/to-flag");
fgUntie("/radios/nav1/from-flag");
fgUntie("/radios/nav1/in-range");
fgUntie("/radios/nav1/dme/distance");
fgUntie("/radios/nav1/dme/in-range");
fgUntie("/radios/nav1/heading-needle-deflection");
fgUntie("/radios/nav1/gs-needle-deflection");
fgUntie("/radios/nav2/frequencies/selected");
fgUntie("/radios/nav2/frequencies/standby");
fgUntie("/radios/nav2/radials/actual");
fgUntie("/radios/nav2/radials/selected");
fgUntie("/radios/nav2/on");
fgUntie("/radios/nav2/ident");
fgUntie("/radios/nav2/to-flag");
fgUntie("/radios/nav2/from-flag");
fgUntie("/radios/nav2/in-range");
fgUntie("/radios/nav2/dme/distance");
fgUntie("/radios/nav2/dme/in-range");
fgUntie("/radios/nav2/heading-needle-deflection");
fgUntie("/radios/nav2/gs-needle-deflection");
fgUntie("/radios/adf/frequencies/selected");
fgUntie("/radios/adf/frequencies/standby");
fgUntie("/radios/adf/rotation");
}
// Update the various nav values based on position and valid tuned in navs
void
FGRadioStack::update()
{
double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
need_update = false;
Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
Point3D station;
double az1, az2, s;
if ( nav1_valid ) {
station = Point3D( nav1_x, nav1_y, nav1_z );
nav1_loc_dist = aircraft.distance3D( station );
if ( nav1_has_dme ) {
// staightline distance
station = Point3D( nav1_dme_x, nav1_dme_y, nav1_dme_z );
nav1_dme_dist = aircraft.distance3D( station );
} else {
nav1_dme_dist = 0.0;
}
if ( nav1_has_gs ) {
station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
nav1_gs_dist = aircraft.distance3D( station );
} else {
nav1_gs_dist = 0.0;
}
nav1_effective_range = kludgeRange(nav1_elev, elev, nav1_range);
if ( nav1_loc_dist < nav1_effective_range * NM_TO_METER ) {
nav1_inrange = true;
// wgs84 heading
geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
nav1_loclat, nav1_loclon,
&az1, &az2, &s );
// cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
nav1_heading = az1 - nav1_magvar;
// Alex: nav1_heading = - (az1 - FGBFI::getMagVar() / RAD_TO_DEG);
// cout << " heading = " << nav1_heading
// << " dist = " << nav1_dist << endl;
} else {
nav1_inrange = false;
}
if ( nav1_loc ) {
} else {
nav1_radial = nav1_sel_radial;
}
} else {
nav1_inrange = false;
nav1_dme_dist = 0.0;
// cout << "not picking up vor. :-(" << endl;
}
if ( nav1_valid && nav1_inrange ) {
// play station ident via audio system if on + ident,
// otherwise turn it off
if ( nav1_on_btn && nav1_ident_btn ) {
if ( nav1_last_time <
globals->get_time_params()->get_cur_time() - 30 ) {
nav1_last_time = globals->get_time_params()->get_cur_time();
nav1_play_count = 0;
}
if ( nav1_play_count < 4 ) {
// play VOR ident
if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
globals->get_soundmgr()->play_once( "nav1-vor-ident" );
++nav1_play_count;
}
} else if ( nav1_play_count < 5 && nav1_has_dme ) {
// play DME ident
if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
!globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
globals->get_soundmgr()->play_once( "nav1-dme-ident" );
++nav1_play_count;
}
}
} else {
globals->get_soundmgr()->stop( "nav1-vor-ident" );
globals->get_soundmgr()->stop( "nav1-dme-ident" );
}
}
if ( nav2_valid ) {
station = Point3D( nav2_x, nav2_y, nav2_z );
nav2_loc_dist = aircraft.distance3D( station );
if ( nav2_has_dme ) {
// staightline distance
station = Point3D( nav2_dme_x, nav2_dme_y, nav2_dme_z );
nav2_dme_dist = aircraft.distance3D( station );
} else {
nav2_dme_dist = 0.0;
}
if ( nav2_has_gs ) {
station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
nav2_gs_dist = aircraft.distance3D( station );
} else {
nav2_gs_dist = 0.0;
}
nav2_effective_range = kludgeRange(nav2_elev, elev, nav2_range);
if ( nav2_loc_dist < nav2_effective_range * NM_TO_METER ) {
nav2_inrange = true;
// wgs84 heading
geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
nav2_loclat, nav2_loclon,
&az1, &az2, &s );
nav2_heading = az1 - nav2_magvar;
// Alex: nav2_heading = - (az1 - FGBFI::getMagVar() / RAD_TO_DEG);
// cout << " heading = " << nav2_heading
// << " dist = " << nav2_dist << endl;
} else {
nav2_inrange = false;
}
if ( !nav2_loc ) {
nav2_radial = nav2_sel_radial;
}
} else {
nav2_inrange = false;
// cout << "not picking up vor. :-(" << endl;
}
// adf
if ( adf_valid ) {
// staightline distance
station = Point3D( adf_x, adf_y, adf_z );
adf_dist = aircraft.distance3D( station );
adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
if ( adf_dist < adf_effective_range * NM_TO_METER ) {
adf_inrange = true;
// wgs84 heading
geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
adf_lat, adf_lon,
&az1, &az2, &s );
adf_heading = az1;
// cout << " heading = " << nav2_heading
// << " dist = " << nav2_dist << endl;
} else {
adf_inrange = false;
}
} else {
adf_inrange = false;
}
}
// Update current nav/adf radio stations based on current postition
void FGRadioStack::search()
{
double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
// nav1
FGILS ils;
FGNav nav;
static string last_nav1_ident = "";
static string last_nav2_ident = "";
static bool last_nav1_vor = false;
static bool last_nav2_vor = false;
if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
nav1_ident = ils.get_locident();
if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
nav1_trans_ident = ils.get_trans_ident();
last_nav1_ident = nav1_ident;
last_nav1_vor = false;
nav1_valid = true;
nav1_loc = true;
nav1_has_dme = ils.get_has_dme();
nav1_has_gs = ils.get_has_gs();
nav1_loclon = ils.get_loclon();
nav1_loclat = ils.get_loclat();
nav1_gslon = ils.get_gslon();
nav1_gslat = ils.get_gslat();
nav1_dmelon = ils.get_dmelon();
nav1_dmelat = ils.get_dmelat();
nav1_elev = ils.get_gselev();
nav1_magvar = 0;
nav1_range = FG_ILS_DEFAULT_RANGE;
nav1_effective_range = nav1_range;
nav1_target_gs = ils.get_gsangle();
nav1_radial = ils.get_locheading();
while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
nav1_x = ils.get_x();
nav1_y = ils.get_y();
nav1_z = ils.get_z();
nav1_gs_x = ils.get_gs_x();
nav1_gs_y = ils.get_gs_y();
nav1_gs_z = ils.get_gs_z();
nav1_dme_x = ils.get_dme_x();
nav1_dme_y = ils.get_dme_y();
nav1_dme_z = ils.get_dme_z();
if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
globals->get_soundmgr()->remove( "nav1-vor-ident" );
}
FGSimpleSound *sound;
sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
globals->get_soundmgr()->remove( "nav1-dme-ident" );
}
sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
int offset = (int)(sg_random() * 30.0);
nav1_play_count = offset / 4;
nav1_last_time = globals->get_time_params()->get_cur_time() -
offset;
cout << "offset = " << offset << " play_count = " << nav1_play_count
<< " nav1_last_time = " << nav1_last_time << " current time = "
<< globals->get_time_params()->get_cur_time() << endl;
cout << "Found an ils station in range" << endl;
cout << " id = " << ils.get_locident() << endl;
}
} else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
nav1_ident = nav.get_ident();
if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
last_nav1_ident = nav1_ident;
last_nav1_vor = true;
nav1_trans_ident = nav.get_trans_ident();
nav1_valid = true;
nav1_loc = false;
nav1_has_dme = nav.get_has_dme();
nav1_has_gs = false;
nav1_loclon = nav.get_lon();
nav1_loclat = nav.get_lat();
nav1_elev = nav.get_elev();
nav1_magvar = nav.get_magvar();
nav1_range = nav.get_range();
nav1_effective_range = kludgeRange(nav1_elev, elev, nav1_range);
nav1_target_gs = 0.0;
nav1_radial = nav1_sel_radial;
nav1_x = nav1_dme_x = nav.get_x();
nav1_y = nav1_dme_y = nav.get_y();
nav1_z = nav1_dme_z = nav.get_z();
if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
globals->get_soundmgr()->remove( "nav1-vor-ident" );
}
FGSimpleSound *sound;
sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
globals->get_soundmgr()->remove( "nav1-dme-ident" );
}
sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
int offset = (int)(sg_random() * 30.0);
nav1_play_count = offset / 4;
nav1_last_time = globals->get_time_params()->get_cur_time() -
offset;
cout << "offset = " << offset << " play_count = " << nav1_play_count
<< " nav1_last_time = " << nav1_last_time << " current time = "
<< globals->get_time_params()->get_cur_time() << endl;
cout << "Found a vor station in range" << endl;
cout << " id = " << nav.get_ident() << endl;
}
} else {
nav1_valid = false;
nav1_ident = "";
nav1_radial = 0;
nav1_dme_dist = 0;
globals->get_soundmgr()->remove( "nav1-vor-ident" );
globals->get_soundmgr()->remove( "nav1-dme-ident" );
cout << "not picking up vor1. :-(" << endl;
}
if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
nav2_ident = ils.get_locident();
if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
last_nav2_ident = nav2_ident;
last_nav2_vor = false;
nav2_trans_ident = ils.get_trans_ident();
nav2_valid = true;
nav2_loc = true;
nav2_has_dme = ils.get_has_dme();
nav2_has_gs = ils.get_has_gs();
nav2_loclon = ils.get_loclon();
nav2_loclat = ils.get_loclat();
nav2_elev = ils.get_gselev();
nav2_magvar = 0;
nav2_range = FG_ILS_DEFAULT_RANGE;
nav2_effective_range = nav2_range;
nav2_target_gs = ils.get_gsangle();
nav2_radial = ils.get_locheading();
while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
nav2_x = ils.get_x();
nav2_y = ils.get_y();
nav2_z = ils.get_z();
nav2_gs_x = ils.get_gs_x();
nav2_gs_y = ils.get_gs_y();
nav2_gs_z = ils.get_gs_z();
nav2_dme_x = ils.get_dme_x();
nav2_dme_y = ils.get_dme_y();
nav2_dme_z = ils.get_dme_z();
// cout << "Found an ils station in range" << endl;
// cout << " id = " << ils.get_locident() << endl;
}
} else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
nav2_ident = nav.get_ident();
if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
last_nav2_ident = nav2_ident;
last_nav2_vor = true;
nav2_trans_ident = nav.get_trans_ident();
nav2_valid = true;
nav2_loc = false;
nav2_has_dme = nav.get_has_dme();
nav2_has_dme = false;
nav2_loclon = nav.get_lon();
nav2_loclat = nav.get_lat();
nav2_elev = nav.get_elev();
nav2_magvar = nav.get_magvar();
nav2_range = nav.get_range();
nav2_effective_range = kludgeRange(nav2_elev, elev, nav2_range);
nav2_target_gs = 0.0;
nav2_radial = nav2_sel_radial;
nav2_x = nav2_dme_x = nav.get_x();
nav2_y = nav2_dme_y = nav.get_y();
nav2_z = nav2_dme_z = nav.get_z();
// cout << "Found a vor station in range" << endl;
// cout << " id = " << nav.get_ident() << endl;
}
} else {
nav2_valid = false;
nav2_ident = "";
nav2_radial = 0;
nav2_dme_dist = 0;
// cout << "not picking up vor2. :-(" << endl;
}
// adf
if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
adf_valid = true;
adf_lon = nav.get_lon();
adf_lat = nav.get_lat();
adf_elev = nav.get_elev();
adf_range = nav.get_range();
adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
adf_x = nav.get_x();
adf_y = nav.get_y();
adf_z = nav.get_z();
// cout << "Found an adf station in range" << endl;
// cout << " id = " << nav.get_ident() << endl;
} else {
adf_valid = false;
// cout << "not picking up adf. :-(" << endl;
}
}
// return the amount of heading needle deflection, returns a value
// clamped to the range of ( -10 , 10 )
double FGRadioStack::get_nav1_heading_needle_deflection() const {
double r;
if ( nav1_inrange ) {
r = nav1_heading - nav1_radial;
// cout << "Radial = " << nav1_radial
// << " Bearing = " << nav1_heading << endl;
while ( r > 180.0 ) { r -= 360.0;}
while ( r < -180.0 ) { r += 360.0;}
if ( fabs(r) > 90.0 ) {
r = ( r<0.0 ? -r-180.0 : -r+180.0 );
if ( nav1_loc ) {
r = -r;
}
}
// According to Robin Peel, the ILS is 4x more sensitive than a vor
if ( nav1_loc ) { r *= 4.0; }
if ( r < -10.0 ) { r = -10.0; }
if ( r > 10.0 ) { r = 10.0; }
} else {
r = 0.0;
}
return r;
}
// return the amount of heading needle deflection, returns a value
// clamped to the range of ( -10 , 10 )
double FGRadioStack::get_nav2_heading_needle_deflection() const {
double r;
if ( nav2_inrange ) {
r = nav2_heading - nav2_radial;
// cout << "Radial = " << nav2_radial
// << " Bearing = " << nav2_heading << endl;
while (r> 180.0) r-=360.0;
while (r<-180.0) r+=360.0;
if ( fabs(r) > 90.0 )
r = ( r<0.0 ? -r-180.0 : -r+180.0 );
// According to Robin Peel, the ILS is 4x more sensitive than a vor
if ( nav2_loc ) r *= 4.0;
if ( r < -10.0 ) r = -10.0;
if ( r > 10.0 ) r = 10.0;
} else {
r = 0.0;
}
return r;
}
// return the amount of glide slope needle deflection (.i.e. the
// number of degrees we are off the glide slope * 5.0
double FGRadioStack::get_nav1_gs_needle_deflection() const {
if ( nav1_inrange && nav1_has_gs ) {
double x = nav1_gs_dist;
double y = (FGBFI::getAltitude() - nav1_elev) * FEET_TO_METER;
double angle = atan2( y, x ) * RAD_TO_DEG;
return (nav1_target_gs - angle) * 5.0;
} else {
return 0.0;
}
}
// return the amount of glide slope needle deflection (.i.e. the
// number of degrees we are off the glide slope * 5.0
double FGRadioStack::get_nav2_gs_needle_deflection() const {
if ( nav2_inrange && nav2_has_gs ) {
double x = nav2_gs_dist;
double y = (FGBFI::getAltitude() - nav2_elev) * FEET_TO_METER;
double angle = atan2( y, x ) * RAD_TO_DEG;
return (nav2_target_gs - angle) * 5.0;
} else {
return 0.0;
}
}
/**
* Return true if the NAV1 TO flag should be active.
*/
bool
FGRadioStack::get_nav1_to_flag () const
{
if (nav1_inrange) {
double offset = fabs(nav1_heading - nav1_radial);
if (nav1_loc)
return true;
else
return (offset <= 90.0 || offset >= 270.0);
} else {
return false;
}
}
/**
* Return true if the NAV1 FROM flag should be active.
*/
bool
FGRadioStack::get_nav1_from_flag () const
{
if (nav1_inrange) {
double offset = fabs(nav1_heading - nav1_radial);
if (nav1_loc)
return false;
else
return (offset > 90.0 && offset < 270.0);
} else {
return false;
}
}
/**
* Return true if the NAV2 TO flag should be active.
*/
bool
FGRadioStack::get_nav2_to_flag () const
{
if (nav2_inrange) {
double offset = fabs(nav2_heading - nav2_radial);
if (nav2_loc)
return true;
else
return (offset <= 90.0 || offset >= 270.0);
} else {
return false;
}
}
/**
* Return true if the NAV2 FROM flag should be active.
*/
bool
FGRadioStack::get_nav2_from_flag () const
{
if (nav2_inrange) {
double offset = fabs(nav2_heading - nav2_radial);
if (nav2_loc)
return false;
else
return (offset > 90.0 && offset < 270.0);
} else {
return false;
}
}
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