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// navradio.cxx -- class to manage a nav radio instance
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// Written by Curtis Olson, started April 2000.
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// Copyright (C) 2000 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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// $Id: navradio.cxx,v 1.6 2005/01/19 02:11:28 curt Exp $
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#include <simgear/compiler.h>
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#include <simgear/sg_inlines.h>
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#include <simgear/math/sg_random.h>
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#include <simgear/math/vector.hxx>
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#include <Aircraft/aircraft.hxx>
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#include <Navaids/navlist.hxx>
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#include "navradio.hxx"
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FGNavRadio::FGNavRadio(SGPropertyNode *node) :
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lon_node(fgGetNode("/position/longitude-deg", true)),
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lat_node(fgGetNode("/position/latitude-deg", true)),
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alt_node(fgGetNode("/position/altitude-ft", true)),
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nav_target_radial(0.0),
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nav_target_radial_true(0.0),
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nav_target_auto_hdg(0.0),
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nav_gs_rate_of_climb(0.0),
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_time_before_search_sec(0.0)
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SGPath path( globals->get_fg_root() );
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term.append( "Navaids/range.term" );
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low.append( "Navaids/range.low" );
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high.append( "Navaids/range.high" );
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term_tbl = new SGInterpTable( term.str() );
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low_tbl = new SGInterpTable( low.str() );
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high_tbl = new SGInterpTable( high.str() );
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for ( i = 0; i < node->nChildren(); ++i ) {
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SGPropertyNode *child = node->getChild(i);
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string cname = child->getName();
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string cval = child->getStringValue();
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if ( cname == "name" ) {
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} else if ( cname == "number" ) {
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num = child->getIntValue();
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SG_LOG( SG_INSTR, SG_WARN,
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"Error in nav radio config logic" );
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if ( name.length() ) {
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SG_LOG( SG_INSTR, SG_WARN, "Section = " << name );
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FGNavRadio::~FGNavRadio()
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branch = "/instrumentation/" + name;
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SGPropertyNode *node = fgGetNode(branch.c_str(), num, true );
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fgGetNode(("/systems/electrical/outputs/" + name).c_str(), true);
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nav_serviceable = node->getChild("serviceable", 0, true);
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cdi_serviceable = (node->getChild("cdi", 0, true))
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->getChild("serviceable", 0, true);
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gs_serviceable = (node->getChild("gs", 0, true))
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->getChild("serviceable");
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tofrom_serviceable = (node->getChild("to-from", 0, true))
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->getChild("serviceable", 0, true);
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std::ostringstream temp;
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temp << name << "nav-ident" << num;
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nav_fx_name = temp.str();
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temp << name << "dme-ident" << num;
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dme_fx_name = temp.str();
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std::ostringstream temp;
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branch = "/instrumentation/" + name + "[" + temp.str() + "]";
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fgTie( (branch + "power-btn").c_str(), this,
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&FGNavRadio::get_power_btn, &FGNavRadio::set_power_btn );
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fgSetArchivable( (branch + "power-btn").c_str() );
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fgTie( (branch + "/frequencies/selected-mhz").c_str() , this,
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&FGNavRadio::get_nav_freq, &FGNavRadio::set_nav_freq );
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fgSetArchivable( (branch + "/frequencies/selected-mhz").c_str() );
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fgTie( (branch + "/frequencies/standby-mhz").c_str() , this,
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&FGNavRadio::get_nav_alt_freq, &FGNavRadio::set_nav_alt_freq);
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fgSetArchivable( (branch + "/frequencies/standby-mhz").c_str() );
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fgTie( (branch + "/frequencies/selected-mhz-fmt").c_str() , this,
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&FGNavRadio::get_fmt_freq, &FGNavRadio::set_fmt_freq );
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fgSetArchivable( (branch + "/frequencies/selected-mhz-fmt").c_str() );
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fgTie( (branch + "/frequencies/standby-mhz-fmt").c_str() , this,
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&FGNavRadio::get_fmt_alt_freq, &FGNavRadio::set_fmt_alt_freq);
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fgSetArchivable( (branch + "/frequencies/standby-mhz-fmt").c_str() );
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fgTie( (branch + "/radials/selected-deg").c_str() , this,
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&FGNavRadio::get_nav_sel_radial, &FGNavRadio::set_nav_sel_radial );
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fgSetArchivable((branch + "/radials/selected-deg").c_str() );
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fgTie( (branch + "/volume").c_str() , this,
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&FGNavRadio::get_nav_vol_btn, &FGNavRadio::set_nav_vol_btn );
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fgSetArchivable( (branch + "/volume").c_str() );
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fgTie( (branch + "/ident").c_str(), this,
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&FGNavRadio::get_nav_ident_btn, &FGNavRadio::set_nav_ident_btn );
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fgSetArchivable( (branch + "/ident").c_str() );
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fgTie( (branch + "/audio-btn").c_str(), this,
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&FGNavRadio::get_audio_btn, &FGNavRadio::set_audio_btn );
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fgSetArchivable( (branch + "/audio-btn").c_str() );
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fgTie( (branch + "/heading-deg").c_str(),
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this, &FGNavRadio::get_nav_heading );
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fgTie( (branch + "/radials/actual-deg").c_str(),
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this, &FGNavRadio::get_nav_radial );
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fgTie( (branch + "/radials/target-radial-deg").c_str(),
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this, &FGNavRadio::get_nav_target_radial_true );
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fgTie( (branch + "/radials/reciprocal-radial-deg").c_str(),
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this, &FGNavRadio::get_nav_reciprocal_radial );
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fgTie( (branch + "/radials/target-auto-hdg-deg").c_str(),
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this, &FGNavRadio::get_nav_target_auto_hdg );
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fgTie( (branch + "/to-flag").c_str(),
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this, &FGNavRadio::get_nav_to_flag );
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fgTie( (branch + "/from-flag").c_str(),
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this, &FGNavRadio::get_nav_from_flag );
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fgTie( (branch + "/in-range").c_str(),
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this, &FGNavRadio::get_nav_inrange );
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fgTie( (branch + "/heading-needle-deflection").c_str(),
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this, &FGNavRadio::get_nav_cdi_deflection );
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fgTie( (branch + "/crosstrack-error-m").c_str(),
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this, &FGNavRadio::get_nav_cdi_xtrack_error );
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fgTie( (branch + "/has-gs").c_str(),
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this, &FGNavRadio::get_nav_has_gs );
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fgTie( (branch + "/nav-loc").c_str(),
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this, &FGNavRadio::get_nav_loc );
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fgTie( (branch + "/gs-rate-of-climb").c_str(),
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this, &FGNavRadio::get_nav_gs_rate_of_climb );
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fgTie( (branch + "/gs-needle-deflection").c_str(),
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this, &FGNavRadio::get_nav_gs_deflection );
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fgTie( (branch + "/gs-distance").c_str(),
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this, &FGNavRadio::get_nav_gs_dist_signed );
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fgTie( (branch + "/nav-distance").c_str(),
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this, &FGNavRadio::get_nav_loc_dist );
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fgTie( (branch + "/nav-id").c_str(),
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this, &FGNavRadio::get_nav_id );
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// put nav_id characters into seperate properties for instrument displays
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fgTie( (branch + "/nav-id_asc1").c_str(),
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this, &FGNavRadio::get_nav_id_c1 );
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fgTie( (branch + "/nav-id_asc2").c_str(),
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this, &FGNavRadio::get_nav_id_c2 );
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fgTie( (branch + "/nav-id_asc3").c_str(),
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this, &FGNavRadio::get_nav_id_c3 );
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fgTie( (branch + "/nav-id_asc4").c_str(),
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this, &FGNavRadio::get_nav_id_c4 );
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FGNavRadio::unbind ()
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std::ostringstream temp;
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branch = "/instrumentation/" + name + "[" + temp.str() + "]";
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fgUntie( (branch + "/frequencies/selected-mhz").c_str() );
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fgUntie( (branch + "/frequencies/standby-mhz").c_str() );
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fgUntie( (branch + "/radials/actual-deg").c_str() );
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fgUntie( (branch + "/radials/selected-deg").c_str() );
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fgUntie( (branch + "/ident").c_str() );
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fgUntie( (branch + "/to-flag").c_str() );
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fgUntie( (branch + "/from-flag").c_str() );
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fgUntie( (branch + "/in-range").c_str() );
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fgUntie( (branch + "/heading-needle-deflection").c_str() );
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fgUntie( (branch + "/gs-needle-deflection").c_str() );
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// model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
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double FGNavRadio::adjustNavRange( double stationElev, double aircraftElev,
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double nominalRange )
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// extend out actual usable range to be 1.3x the published safe range
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const double usability_factor = 1.3;
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// assumptions we model the standard service volume, plus
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// ... rather than specifying a cylinder, we model a cone that
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// contains the cylinder. Then we put an upside down cone on top
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// to model diminishing returns at too-high altitudes.
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// altitude difference
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double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
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// cout << "aircraft elev = " << aircraftElev * SG_METER_TO_FEET
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// << " station elev = " << stationElev << endl;
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if ( nominalRange < 25.0 + SG_EPSILON ) {
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// Standard Terminal Service Volume
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return term_tbl->interpolate( alt ) * usability_factor;
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} else if ( nominalRange < 50.0 + SG_EPSILON ) {
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// Standard Low Altitude Service Volume
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// table is based on range of 40, scale to actual range
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return low_tbl->interpolate( alt ) * nominalRange / 40.0
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// Standard High Altitude Service Volume
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// table is based on range of 130, scale to actual range
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return high_tbl->interpolate( alt ) * nominalRange / 130.0
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// model standard ILS service volumes as per AIM 1-1-9
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double FGNavRadio::adjustILSRange( double stationElev, double aircraftElev,
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double offsetDegrees, double distance )
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// assumptions we model the standard service volume, plus
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// altitude difference
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// double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
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// double offset = fabs( offsetDegrees );
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// if ( offset < 10 ) {
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// return FG_ILS_DEFAULT_RANGE;
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// } else if ( offset < 35 ) {
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// return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
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// } else if ( offset < 45 ) {
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// return (45 - offset);
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// } else if ( offset > 170 ) {
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// return FG_ILS_DEFAULT_RANGE;
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// } else if ( offset > 145 ) {
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// return 10 + (offset - 145) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
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// } else if ( offset > 135 ) {
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// return (offset - 135);
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return FG_LOC_DEFAULT_RANGE;
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// Update the various nav values based on position and valid tuned in navs
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FGNavRadio::update(double dt)
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double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
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Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
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// Create "formatted" versions of the nav frequencies for
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// consistant display output.
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sprintf( tmp, "%.2f", nav_freq );
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sprintf( tmp, "%.2f", nav_alt_freq );
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// On timeout, scan again
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_time_before_search_sec -= dt;
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if ( _time_before_search_sec < 0 ) {
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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// cout << "nav_valid = " << nav_valid
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// << " power_btn = " << power_btn
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// << " bus_power = " << bus_power->getDoubleValue()
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// << " nav_serviceable = " << nav_serviceable->getBoolValue()
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if ( nav_valid && power_btn && (bus_power->getDoubleValue() > 1.0)
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&& nav_serviceable->getBoolValue() )
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station = Point3D( nav_x, nav_y, nav_z );
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nav_loc_dist = aircraft.distance3D( station );
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// cout << "station = " << station << " dist = " << nav_loc_dist
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// find closest distance to the gs base line
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sgdSetVec3( p, aircraft.x(), aircraft.y(), aircraft.z() );
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sgdSetVec3( p0, nav_gs_x, nav_gs_y, nav_gs_z );
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double dist = sgdClosestPointToLineDistSquared( p, p0,
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nav_gs_dist = sqrt( dist );
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// cout << "nav_gs_dist = " << nav_gs_dist << endl;
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Point3D tmp( nav_gs_x, nav_gs_y, nav_gs_z );
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// cout << " (" << aircraft.distance3D( tmp ) << ")" << endl;
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// wgs84 heading to glide slope (to determine sign of distance)
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geo_inverse_wgs_84( elev,
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lat * SGD_RADIANS_TO_DEGREES,
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lon * SGD_RADIANS_TO_DEGREES,
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nav_gslat, nav_gslon,
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double r = az1 - nav_target_radial;
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while ( r > 180.0 ) { r -= 360.0;}
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while ( r < -180.0 ) { r += 360.0;}
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if ( r >= -90.0 && r <= 90.0 ) {
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nav_gs_dist_signed = nav_gs_dist;
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nav_gs_dist_signed = -nav_gs_dist;
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/* cout << "Target Radial = " << nav_target_radial
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<< " Bearing = " << az1
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<< " dist (signed) = " << nav_gs_dist_signed
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// wgs84 heading to localizer
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geo_inverse_wgs_84( elev,
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lat * SGD_RADIANS_TO_DEGREES,
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lon * SGD_RADIANS_TO_DEGREES,
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nav_loclat, nav_loclon,
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&nav_heading, &az2, &s );
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// cout << "az1 = " << az1 << " magvar = " << nav_magvar << endl;
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nav_radial = az2 - nav_twist;
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// cout << " heading = " << nav_heading
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// << " dist = " << nav_dist << endl;
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double offset = nav_radial - nav_target_radial;
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while ( offset < -180.0 ) { offset += 360.0; }
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while ( offset > 180.0 ) { offset -= 360.0; }
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// cout << "ils offset = " << offset << endl;
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= adjustILSRange( nav_elev, elev, offset,
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nav_loc_dist * SG_METER_TO_NM );
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nav_effective_range = adjustNavRange( nav_elev, elev, nav_range );
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// cout << "nav range = " << nav_effective_range
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// << " (" << nav_range << ")" << endl;
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if ( nav_loc_dist < nav_effective_range * SG_NM_TO_METER ) {
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} else if ( nav_loc_dist < 2 * nav_effective_range * SG_NM_TO_METER ) {
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nav_inrange = sg_random() <
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( 2 * nav_effective_range * SG_NM_TO_METER - nav_loc_dist ) /
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(nav_effective_range * SG_NM_TO_METER);
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nav_target_radial = nav_sel_radial;
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// Calculate some values for the nav/ils hold autopilot
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double cur_radial = get_nav_reciprocal_radial();
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// ILS localizers radials are already "true" in our
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cur_radial += nav_twist;
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if ( get_nav_from_flag() ) {
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while ( cur_radial >= 360.0 ) { cur_radial -= 360.0; }
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// determine the target radial in "true" heading
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nav_target_radial_true = nav_target_radial;
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// ILS localizers radials are already "true" in our
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// VOR radials need to have that vor's offset added in
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nav_target_radial_true += nav_twist;
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while ( nav_target_radial_true < 0.0 ) {
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nav_target_radial_true += 360.0;
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while ( nav_target_radial_true > 360.0 ) {
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nav_target_radial_true -= 360.0;
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// determine the heading adjustment needed.
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// over 8km scale by 3.0
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// (3 is chosen because max deflection is 10
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// and 30 is clamped angle to radial)
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// under 8km scale by 10.0
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// because the overstated error helps drive it to the radial in a
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// moderate cross wind.
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double adjustment = 0.0;
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if (nav_loc_dist > 8000) {
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adjustment = get_nav_cdi_deflection() * 3.0;
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adjustment = get_nav_cdi_deflection() * 10.0;
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SG_CLAMP_RANGE( adjustment, -30.0, 30.0 );
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// determine the target heading to fly to intercept the
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nav_target_auto_hdg = nav_target_radial_true + adjustment;
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while ( nav_target_auto_hdg < 0.0 ) { nav_target_auto_hdg += 360.0; }
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while ( nav_target_auto_hdg > 360.0 ) { nav_target_auto_hdg -= 360.0; }
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// Calculate desired rate of climb for intercepting the GS
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double x = nav_gs_dist;
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double y = (alt_node->getDoubleValue() - nav_elev)
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double current_angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
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double target_angle = nav_target_gs;
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double gs_diff = target_angle - current_angle;
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// convert desired vertical path angle into a climb rate
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double des_angle = current_angle - 10 * gs_diff;
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// estimate horizontal speed towards ILS in meters per minute
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double dist = last_x - x;
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double new_vel = ( dist / dt );
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horiz_vel = 0.75 * horiz_vel + 0.25 * new_vel;
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// double horiz_vel = cur_fdm_state->get_V_ground_speed()
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// * SG_FEET_TO_METER * 60.0;
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// double horiz_vel = airspeed_node->getFloatValue()
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// * SG_FEET_TO_METER * 60.0;
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nav_gs_rate_of_climb = -sin( des_angle * SGD_DEGREES_TO_RADIANS )
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* horiz_vel * SG_METER_TO_FEET;
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// cout << "not picking up vor. :-(" << endl;
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if ( nav_valid && nav_inrange && nav_serviceable->getBoolValue() ) {
556
// play station ident via audio system if on + ident,
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// otherwise turn it off
558
if ( power_btn && (bus_power->getDoubleValue() > 1.0)
559
&& nav_ident_btn && audio_btn )
561
SGSoundSample *sound;
562
sound = globals->get_soundmgr()->find( nav_fx_name );
563
if ( sound != NULL ) {
564
sound->set_volume( nav_vol_btn );
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SG_LOG( SG_COCKPIT, SG_ALERT,
567
"Can't find nav-vor-ident sound" );
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sound = globals->get_soundmgr()->find( dme_fx_name );
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if ( sound != NULL ) {
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sound->set_volume( nav_vol_btn );
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SG_LOG( SG_COCKPIT, SG_ALERT,
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"Can't find nav-dme-ident sound" );
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// cout << "nav_last_time = " << nav_last_time << " ";
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// cout << "cur_time = "
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// << globals->get_time_params()->get_cur_time();
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globals->get_time_params()->get_cur_time() - 30 ) {
581
nav_last_time = globals->get_time_params()->get_cur_time();
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// cout << " nav_play_count = " << nav_play_count << endl;
585
// cout << "playing = "
586
// << globals->get_soundmgr()->is_playing(nav_fx_name)
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if ( nav_play_count < 4 ) {
590
if ( !globals->get_soundmgr()->is_playing(nav_fx_name) ) {
591
globals->get_soundmgr()->play_once( nav_fx_name );
594
} else if ( nav_play_count < 5 && nav_has_dme ) {
596
if ( !globals->get_soundmgr()->is_playing(nav_fx_name) &&
597
!globals->get_soundmgr()->is_playing(dme_fx_name) ) {
598
globals->get_soundmgr()->play_once( dme_fx_name );
603
globals->get_soundmgr()->stop( nav_fx_name );
604
globals->get_soundmgr()->stop( dme_fx_name );
610
// Update current nav/adf radio stations based on current postition
611
void FGNavRadio::search()
615
_time_before_search_sec = 1.0;
617
double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
618
double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
619
double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
621
FGNavRecord *nav = NULL;
622
FGNavRecord *loc = NULL;
623
FGNavRecord *dme = NULL;
624
FGNavRecord *gs = NULL;
626
////////////////////////////////////////////////////////////////////////
628
////////////////////////////////////////////////////////////////////////
630
nav = globals->get_navlist()->findByFreq(nav_freq, lon, lat, elev);
631
dme = globals->get_dmelist()->findByFreq(nav_freq, lon, lat, elev);
633
loc = globals->get_loclist()->findByFreq(nav_freq, lon, lat, elev);
634
gs = globals->get_gslist()->findByFreq(nav_freq, lon, lat, elev);
638
nav_id = loc->get_ident();
639
// cout << "localizer = " << nav_id << endl;
641
if ( last_nav_id != nav_id || last_nav_vor ) {
642
nav_trans_ident = loc->get_trans_ident();
643
nav_target_radial = loc->get_multiuse();
644
while ( nav_target_radial < 0.0 ) { nav_target_radial += 360.0; }
645
while ( nav_target_radial > 360.0 ) { nav_target_radial -= 360.0; }
646
nav_loclon = loc->get_lon();
647
nav_loclat = loc->get_lat();
648
nav_x = loc->get_x();
649
nav_y = loc->get_y();
650
nav_z = loc->get_z();
651
last_nav_id = nav_id;
652
last_nav_vor = false;
654
nav_has_dme = (dme != NULL);
655
nav_has_gs = (gs != NULL);
657
nav_gslon = gs->get_lon();
658
nav_gslat = gs->get_lat();
659
nav_elev = gs->get_elev_ft();
660
int tmp = (int)(gs->get_multiuse() / 1000.0);
661
nav_target_gs = (double)tmp / 100.0;
662
nav_gs_x = gs->get_x();
663
nav_gs_y = gs->get_y();
664
nav_gs_z = gs->get_z();
666
// derive GS baseline (perpendicular to the runay
668
double tlon, tlat, taz;
669
geo_direct_wgs_84 ( 0.0, nav_gslat, nav_gslon,
670
nav_target_radial + 90,
671
100.0, &tlat, &tlon, &taz );
672
// cout << "nav_target_radial = " << nav_target_radial << endl;
673
// cout << "nav_loc = " << nav_loc << endl;
674
// cout << nav_gslon << "," << nav_gslat << " "
675
// << tlon << "," << tlat << " (" << nav_elev << ")"
677
Point3D p1 = sgGeodToCart( Point3D(tlon*SGD_DEGREES_TO_RADIANS,
678
tlat*SGD_DEGREES_TO_RADIANS,
679
nav_elev*SG_FEET_TO_METER)
681
// cout << nav_gs_x << "," << nav_gs_y << "," << nav_gs_z
683
// cout << p1 << endl;
684
sgdSetVec3( gs_base_vec,
685
p1.x()-nav_gs_x, p1.y()-nav_gs_y, p1.z()-nav_gs_z );
686
// cout << gs_base_vec[0] << "," << gs_base_vec[1] << ","
687
// << gs_base_vec[2] << endl;
689
nav_elev = loc->get_elev_ft();
692
nav_range = FG_LOC_DEFAULT_RANGE;
693
nav_effective_range = nav_range;
695
if ( globals->get_soundmgr()->exists( nav_fx_name ) ) {
696
globals->get_soundmgr()->remove( nav_fx_name );
698
SGSoundSample *sound;
699
sound = morse.make_ident( nav_trans_ident, LO_FREQUENCY );
700
sound->set_volume( 0.3 );
701
globals->get_soundmgr()->add( sound, nav_fx_name );
703
if ( globals->get_soundmgr()->exists( dme_fx_name ) ) {
704
globals->get_soundmgr()->remove( dme_fx_name );
706
sound = morse.make_ident( nav_trans_ident, HI_FREQUENCY );
707
sound->set_volume( 0.3 );
708
globals->get_soundmgr()->add( sound, dme_fx_name );
710
int offset = (int)(sg_random() * 30.0);
711
nav_play_count = offset / 4;
712
nav_last_time = globals->get_time_params()->get_cur_time() -
714
// cout << "offset = " << offset << " play_count = "
716
// << " nav_last_time = " << nav_last_time
717
// << " current time = "
718
// << globals->get_time_params()->get_cur_time() << endl;
720
// cout << "Found an loc station in range" << endl;
721
// cout << " id = " << loc->get_locident() << endl;
723
} else if ( nav != NULL ) {
724
nav_id = nav->get_ident();
725
// cout << "nav = " << nav_id << endl;
727
if ( last_nav_id != nav_id || !last_nav_vor ) {
728
last_nav_id = nav_id;
730
nav_trans_ident = nav->get_trans_ident();
732
nav_has_dme = (dme != NULL);
734
nav_loclon = nav->get_lon();
735
nav_loclat = nav->get_lat();
736
nav_elev = nav->get_elev_ft();
737
nav_twist = nav->get_multiuse();
738
nav_range = nav->get_range();
739
nav_effective_range = adjustNavRange(nav_elev, elev, nav_range);
741
nav_target_radial = nav_sel_radial;
742
nav_x = nav->get_x();
743
nav_y = nav->get_y();
744
nav_z = nav->get_z();
746
if ( globals->get_soundmgr()->exists( nav_fx_name ) ) {
747
globals->get_soundmgr()->remove( nav_fx_name );
749
SGSoundSample *sound;
750
sound = morse.make_ident( nav_trans_ident, LO_FREQUENCY );
751
sound->set_volume( 0.3 );
752
if ( globals->get_soundmgr()->add( sound, nav_fx_name ) ) {
753
// cout << "Added nav-vor-ident sound" << endl;
755
SG_LOG(SG_COCKPIT, SG_WARN, "Failed to add v1-vor-ident sound");
758
if ( globals->get_soundmgr()->exists( dme_fx_name ) ) {
759
globals->get_soundmgr()->remove( dme_fx_name );
761
sound = morse.make_ident( nav_trans_ident, HI_FREQUENCY );
762
sound->set_volume( 0.3 );
763
globals->get_soundmgr()->add( sound, dme_fx_name );
765
int offset = (int)(sg_random() * 30.0);
766
nav_play_count = offset / 4;
767
nav_last_time = globals->get_time_params()->get_cur_time() -
769
// cout << "offset = " << offset << " play_count = "
770
// << nav_play_count << " nav_last_time = "
771
// << nav_last_time << " current time = "
772
// << globals->get_time_params()->get_cur_time() << endl;
774
// cout << "Found a vor station in range" << endl;
775
// cout << " id = " << nav->get_ident() << endl;
780
nav_target_radial = 0;
781
nav_trans_ident = "";
783
if ( ! globals->get_soundmgr()->remove( nav_fx_name ) ) {
784
SG_LOG(SG_COCKPIT, SG_WARN, "Failed to remove nav-vor-ident sound");
786
globals->get_soundmgr()->remove( dme_fx_name );
787
// cout << "not picking up vor1. :-(" << endl;
792
// return the amount of heading needle deflection, returns a value
793
// clamped to the range of ( -10 , 10 )
794
double FGNavRadio::get_nav_cdi_deflection() const {
798
&& nav_serviceable->getBoolValue() && cdi_serviceable->getBoolValue() )
800
r = nav_radial - nav_target_radial;
801
// cout << "Target radial = " << nav_target_radial
802
// << " Actual radial = " << nav_radial << endl;
804
while ( r > 180.0 ) { r -= 360.0;}
805
while ( r < -180.0 ) { r += 360.0;}
806
if ( fabs(r) > 90.0 )
807
r = ( r<0.0 ? -r-180.0 : -r+180.0 );
809
// According to Robin Peel, the ILS is 4x more sensitive than a vor
810
r = -r; // reverse, since radial is outbound
811
if ( nav_loc ) { r *= 4.0; }
812
if ( r < -10.0 ) { r = -10.0; }
813
if ( r > 10.0 ) { r = 10.0; }
821
// return the amount of cross track distance error, returns a meters
822
double FGNavRadio::get_nav_cdi_xtrack_error() const {
826
&& nav_serviceable->getBoolValue() && cdi_serviceable->getBoolValue() )
828
r = nav_radial - nav_target_radial;
829
// cout << "Target radial = " << nav_target_radial
830
// << " Actual radial = " << nav_radial
831
// << " r = " << r << endl;
833
while ( r > 180.0 ) { r -= 360.0;}
834
while ( r < -180.0 ) { r += 360.0;}
835
if ( fabs(r) > 90.0 )
836
r = ( r<0.0 ? -r-180.0 : -r+180.0 );
838
r = -r; // reverse, since radial is outbound
840
m = nav_loc_dist * sin(r * SGD_DEGREES_TO_RADIANS);
849
// return the amount of glide slope needle deflection (.i.e. the
850
// number of degrees we are off the glide slope * 5.0
851
double FGNavRadio::get_nav_gs_deflection() const {
852
if ( nav_inrange && nav_has_gs
853
&& nav_serviceable->getBoolValue() && gs_serviceable->getBoolValue() )
855
double x = nav_gs_dist;
856
double y = (fgGetDouble("/position/altitude-ft") - nav_elev)
858
// cout << "dist = " << x << " height = " << y << endl;
859
double angle = asin( y / x ) * SGD_RADIANS_TO_DEGREES;
860
return (nav_target_gs - angle) * 5.0;
868
* Return true if the NAV TO flag should be active.
871
FGNavRadio::get_nav_to_flag () const
874
&& nav_serviceable->getBoolValue()
875
&& tofrom_serviceable->getBoolValue() )
877
double offset = fabs(nav_radial - nav_target_radial);
881
return !(offset <= 90.0 || offset >= 270.0);
890
* Return true if the NAV FROM flag should be active.
893
FGNavRadio::get_nav_from_flag () const
896
&& nav_serviceable->getBoolValue()
897
&& tofrom_serviceable->getBoolValue() ) {
898
double offset = fabs(nav_radial - nav_target_radial);
902
return !(offset > 90.0 && offset < 270.0);
911
* Return the true heading to station
914
FGNavRadio::get_nav_heading () const
921
* Return the current radial.
924
FGNavRadio::get_nav_radial () const
930
FGNavRadio::get_nav_reciprocal_radial () const
932
double recip = nav_radial + 180;
933
if ( recip >= 360 ) {
added
removed
src/Instrumentation/navradio.cxx
