1 // radiostack.cxx -- class to manage an instance of the radio stack
3 // Written by Curtis Olson, started April 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <simgear/compiler.h>
29 #include <simgear/math/sg_random.h>
31 #include <Aircraft/aircraft.hxx>
32 #include <ATC/ATCdisplay.hxx>
33 //#include <Navaids/atis.hxx>
34 #include <Navaids/ilslist.hxx>
35 #include <Navaids/mkrbeacons.hxx>
36 #include <Navaids/navlist.hxx>
37 #include <Time/event.hxx>
39 #include "radiostack.hxx"
44 static int nav1_play_count = 0;
45 static int nav2_play_count = 0;
46 static int adf_play_count = 0;
47 static time_t nav1_last_time = 0;
48 static time_t nav2_last_time = 0;
49 static time_t adf_last_time = 0;
52 FGRadioStack *current_radiostack;
56 * Boy, this is ugly! Make the VOR range vary by altitude difference.
58 static double kludgeRange ( double stationElev, double aircraftElev,
61 // Assume that the nominal range (usually
62 // 50nm) applies at a 5,000 ft difference.
64 double factor = ((aircraftElev*SG_METER_TO_FEET) - stationElev) / 5000.0;
65 double range = fabs(nominalRange * factor);
67 // Clamp the range to keep it sane; for
68 // now, never less than 25% or more than
69 // 500% of nominal range.
70 if (range < nominalRange/4.0) {
71 range = nominalRange/4.0;
72 } else if (range > nominalRange*5.0) {
73 range = nominalRange*5.0;
80 // periodic radio station search wrapper
81 static void fgRadioSearch( void ) {
82 current_radiostack->search();
86 FGRadioStack::FGRadioStack() :
87 lon_node(fgGetNode("/position/longitude-deg", true)),
88 lat_node(fgGetNode("/position/latitude-deg", true)),
89 alt_node(fgGetNode("/position/altitude-ft", true)),
109 SGPath path( globals->get_fg_root() );
111 term.append( "Navaids/range.term" );
113 low.append( "Navaids/range.low" );
115 high.append( "Navaids/range.high" );
117 term_tbl = new SGInterpTable( term.str() );
118 low_tbl = new SGInterpTable( low.str() );
119 high_tbl = new SGInterpTable( high.str() );
120 dme_last_time.stamp();
125 FGRadioStack::~FGRadioStack()
127 unbind(); // FIXME: should be called externally
136 FGRadioStack::init ()
145 // Search radio database once per second
146 global_events.Register( "fgRadioSearch()", fgRadioSearch,
147 fgEVENT::FG_EVENT_READY, 1000);
151 FGRadioStack::bind ()
154 fgTie("/radios/comm[0]/frequencies/selected-mhz", this,
155 &FGRadioStack::get_comm1_freq, &FGRadioStack::set_comm1_freq);
156 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
157 fgTie("/radios/comm[0]/frequencies/standby-mhz", this,
158 &FGRadioStack::get_comm1_alt_freq, &FGRadioStack::set_comm1_alt_freq);
159 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
160 fgTie("/radios/comm[0]/volume", this,
161 &FGRadioStack::get_comm1_vol_btn,
162 &FGRadioStack::set_comm1_vol_btn);
163 fgSetArchivable("/radios/comm[0]/volume");
164 fgTie("/radios/comm[0]/ident", this,
165 &FGRadioStack::get_comm1_ident_btn,
166 &FGRadioStack::set_comm1_ident_btn);
167 fgSetArchivable("/radios/comm[0]/ident");
169 fgTie("/radios/comm[1]/frequencies/selected-mhz", this,
170 &FGRadioStack::get_comm2_freq, &FGRadioStack::set_comm2_freq);
171 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
172 fgTie("/radios/comm[1]/frequencies/standby-mhz", this,
173 &FGRadioStack::get_comm2_alt_freq, &FGRadioStack::set_comm2_alt_freq);
174 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
175 fgTie("/radios/comm[1]/volume", this,
176 &FGRadioStack::get_comm2_vol_btn,
177 &FGRadioStack::set_comm2_vol_btn);
178 fgSetArchivable("/radios/comm[0]/volume");
179 fgTie("/radios/comm[1]/ident", this,
180 &FGRadioStack::get_comm2_ident_btn,
181 &FGRadioStack::set_comm2_ident_btn);
182 fgSetArchivable("/radios/comm[1]/ident");
184 fgTie("/radios/nav[0]/frequencies/selected-mhz", this,
185 &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
186 fgSetArchivable("/radios/nav[0]/frequencies/selected-mhz");
187 fgTie("/radios/nav[0]/frequencies/standby-mhz", this,
188 &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
189 fgSetArchivable("/radios/nav[0]/frequencies/standby-mhz");
190 fgTie("/radios/nav[0]/radials/selected-deg", this,
191 &FGRadioStack::get_nav1_sel_radial,
192 &FGRadioStack::set_nav1_sel_radial);
193 fgSetArchivable("/radios/nav[0]/radials/selected-deg");
194 fgTie("/radios/nav[0]/volume", this,
195 &FGRadioStack::get_nav1_vol_btn,
196 &FGRadioStack::set_nav1_vol_btn);
197 fgSetArchivable("/radios/nav[0]/volume");
198 fgTie("/radios/nav[0]/ident", this,
199 &FGRadioStack::get_nav1_ident_btn,
200 &FGRadioStack::set_nav1_ident_btn);
201 fgSetArchivable("/radios/nav[0]/ident");
204 fgTie("/radios/nav[0]/radials/actual-deg", this,
205 &FGRadioStack::get_nav1_radial);
206 fgTie("/radios/nav[0]/to-flag", this, &FGRadioStack::get_nav1_to_flag);
207 fgTie("/radios/nav[0]/from-flag", this, &FGRadioStack::get_nav1_from_flag);
208 fgTie("/radios/nav[0]/in-range", this, &FGRadioStack::get_nav1_inrange);
209 fgTie("/radios/nav[0]/heading-needle-deflection", this,
210 &FGRadioStack::get_nav1_heading_needle_deflection);
211 fgTie("/radios/nav[0]/gs-needle-deflection", this,
212 &FGRadioStack::get_nav1_gs_needle_deflection);
215 fgTie("/radios/nav[1]/frequencies/selected-mhz", this,
216 &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
217 fgSetArchivable("/radios/nav[1]/frequencies/selected-mhz");
218 fgTie("/radios/nav[1]/frequencies/standby-mhz", this,
219 &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
220 fgSetArchivable("/radios/nav[1]/frequencies/standby-mhz");
221 fgTie("/radios/nav[1]/radials/selected-deg", this,
222 &FGRadioStack::get_nav2_sel_radial,
223 &FGRadioStack::set_nav2_sel_radial);
224 fgSetArchivable("/radios/nav[1]/radials/selected-deg");
225 fgTie("/radios/nav[1]/volume", this,
226 &FGRadioStack::get_nav2_vol_btn,
227 &FGRadioStack::set_nav2_vol_btn);
228 fgSetArchivable("/radios/nav[1]/volume");
229 fgTie("/radios/nav[1]/ident", this,
230 &FGRadioStack::get_nav2_ident_btn,
231 &FGRadioStack::set_nav2_ident_btn);
232 fgSetArchivable("/radios/nav[1]/ident");
235 fgTie("/radios/nav[1]/radials/actual-deg", this,
236 &FGRadioStack::get_nav2_radial);
237 fgTie("/radios/nav[1]/to-flag", this, &FGRadioStack::get_nav2_to_flag);
238 fgTie("/radios/nav[1]/from-flag", this, &FGRadioStack::get_nav2_from_flag);
239 fgTie("/radios/nav[1]/in-range", this, &FGRadioStack::get_nav2_inrange);
240 fgTie("/radios/nav[1]/heading-needle-deflection", this,
241 &FGRadioStack::get_nav2_heading_needle_deflection);
242 fgTie("/radios/nav[1]/gs-needle-deflection", this,
243 &FGRadioStack::get_nav2_gs_needle_deflection);
246 fgTie("/radios/dme/frequencies/selected-khz", this,
247 &FGRadioStack::get_dme_freq, &FGRadioStack::set_adf_freq);
250 fgTie("/radios/dme/in-range", this, &FGRadioStack::get_dme_inrange);
251 fgTie("/radios/dme/distance-nm", this, &FGRadioStack::get_dme_dist);
252 fgTie("/radios/dme/speed-kt", this, &FGRadioStack::get_dme_spd);
253 fgTie("/radios/dme/ete-min", this, &FGRadioStack::get_dme_ete);
256 fgTie("/radios/adf/frequencies/selected-khz", this,
257 &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
258 fgSetArchivable("/radios/adf/frequencies/selected-khz");
259 fgTie("/radios/adf/frequencies/standby-khz", this,
260 &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
261 fgSetArchivable("/radios/adf/frequencies/standby-khz");
262 fgTie("/radios/adf/rotation-deg", this,
263 &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
264 fgSetArchivable("/radios/adf/rotation-deg");
265 fgTie("/radios/adf/volume", this,
266 &FGRadioStack::get_adf_vol_btn,
267 &FGRadioStack::set_adf_vol_btn);
268 fgSetArchivable("/radios/adf/volume");
269 fgTie("/radios/adf/ident", this,
270 &FGRadioStack::get_adf_ident_btn,
271 &FGRadioStack::set_adf_ident_btn);
272 fgSetArchivable("/radios/adf/ident");
274 fgTie("/radios/marker-beacon/inner", this,
275 &FGRadioStack::get_inner_blink);
276 fgTie("/radios/marker-beacon/middle", this,
277 &FGRadioStack::get_middle_blink);
278 fgTie("/radios/marker-beacon/outer", this,
279 &FGRadioStack::get_outer_blink);
283 FGRadioStack::unbind ()
285 fgUntie("/radios/comm[0]/frequencies/selected-mhz");
286 fgUntie("/radios/comm[0]/frequencies/standby-mhz");
287 fgUntie("/radios/comm[0]/on");
288 fgUntie("/radios/comm[0]/ident");
290 fgUntie("/radios/comm[1]/frequencies/selected-mhz");
291 fgUntie("/radios/comm[1]/frequencies/standby-mhz");
292 fgUntie("/radios/comm[1]/on");
293 fgUntie("/radios/comm[1]/ident");
295 fgUntie("/radios/nav[0]/frequencies/selected-mhz");
296 fgUntie("/radios/nav[0]/frequencies/standby-mhz");
297 fgUntie("/radios/nav[0]/radials/actual-deg");
298 fgUntie("/radios/nav[0]/radials/selected-deg");
299 fgUntie("/radios/nav[0]/on");
300 fgUntie("/radios/nav[0]/ident");
301 fgUntie("/radios/nav[0]/to-flag");
302 fgUntie("/radios/nav[0]/from-flag");
303 fgUntie("/radios/nav[0]/in-range");
304 fgUntie("/radios/nav[0]/heading-needle-deflection");
305 fgUntie("/radios/nav[0]/gs-needle-deflection");
307 fgUntie("/radios/nav[1]/frequencies/selected-mhz");
308 fgUntie("/radios/nav[1]/frequencies/standby-mhz");
309 fgUntie("/radios/nav[1]/radials/actual-deg");
310 fgUntie("/radios/nav[1]/radials/selected-deg");
311 fgUntie("/radios/nav[1]/on");
312 fgUntie("/radios/nav[1]/ident");
313 fgUntie("/radios/nav[1]/to-flag");
314 fgUntie("/radios/nav[1]/from-flag");
315 fgUntie("/radios/nav[1]/in-range");
316 fgUntie("/radios/nav[1]/heading-needle-deflection");
317 fgUntie("/radios/nav[1]/gs-needle-deflection");
319 fgUntie("/radios/dme/frequencies/selected-khz");
322 fgUntie("/radios/dme/in-range");
323 fgUntie("/radios/dme/distance-nm");
324 fgUntie("/radios/dme/speed-kt");
325 fgUntie("/radios/dme/ete-min");
327 fgUntie("/radios/adf/frequencies/selected-khz");
328 fgUntie("/radios/adf/frequencies/standby-khz");
329 fgUntie("/radios/adf/rotation-deg");
330 fgUntie("/radios/adf/on");
331 fgUntie("/radios/adf/ident");
333 fgUntie("/radios/marker-beacon/inner");
334 fgUntie("/radios/marker-beacon/middle");
335 fgUntie("/radios/marker-beacon/outer");
339 // model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
340 double FGRadioStack::adjustNavRange( double stationElev, double aircraftElev,
341 double nominalRange )
343 // extend out actual usable range to be 1.3x the published safe range
344 const double usability_factor = 1.3;
346 // assumptions we model the standard service volume, plus
347 // ... rather than specifying a cylinder, we model a cone that
348 // contains the cylinder. Then we put an upside down cone on top
349 // to model diminishing returns at too-high altitudes.
351 // altitude difference
352 double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
353 // cout << "aircraft elev = " << aircraftElev * SG_METER_TO_FEET
354 // << " station elev = " << stationElev << endl;
356 if ( nominalRange < 25.0 + SG_EPSILON ) {
357 // Standard Terminal Service Volume
358 return term_tbl->interpolate( alt ) * usability_factor;
359 } else if ( nominalRange < 50.0 + SG_EPSILON ) {
360 // Standard Low Altitude Service Volume
361 // table is based on range of 40, scale to actual range
362 return low_tbl->interpolate( alt ) * nominalRange / 40.0
365 // Standard High Altitude Service Volume
366 // table is based on range of 130, scale to actual range
367 return high_tbl->interpolate( alt ) * nominalRange / 130.0
373 // model standard ILS service volumes as per AIM 1-1-9
374 double FGRadioStack::adjustILSRange( double stationElev, double aircraftElev,
375 double offsetDegrees, double distance )
377 // assumptions we model the standard service volume, plus
379 // altitude difference
380 // double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
381 double offset = fabs( offsetDegrees );
384 return FG_ILS_DEFAULT_RANGE;
385 } else if ( offset < 35 ) {
386 return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
387 } else if ( offset < 45 ) {
388 return (45 - offset);
389 } else if ( offset > 170 ) {
390 return FG_ILS_DEFAULT_RANGE;
391 } else if ( offset > 145 ) {
392 return 10 + (offset - 145) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
393 } else if ( offset > 135 ) {
394 return (offset - 135);
401 // Update the various nav values based on position and valid tuned in navs
403 FGRadioStack::update()
408 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
409 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
410 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
414 Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
418 ////////////////////////////////////////////////////////////////////////
420 ////////////////////////////////////////////////////////////////////////
422 static bool repeating_message_registered = false;
423 static int dcl_i = 0; //Hack to only call the transmission now and then - should use the event scheduler
425 station = Point3D( comm1_x, comm1_y, comm1_z );
426 comm1_dist = aircraft.distance3D( station );
427 if ( comm1_dist < comm1_effective_range * SG_NM_TO_METER ) {
428 comm1_inrange = true;
429 // TODO - only get the transmission and register every now and then
431 transmission = atis.get_transmission();
432 //ChangeRepeatingMessage(transmission);
434 if(!repeating_message_registered) {
435 current_atcdisplay->RegisterRepeatingMessage( transmission );
436 repeating_message_registered = true;
443 comm1_inrange = false;
444 if(repeating_message_registered) {
445 current_atcdisplay->CancelRepeatingMessage();
446 repeating_message_registered = false;
451 comm1_inrange = false;
452 if(repeating_message_registered) {
453 current_atcdisplay->CancelRepeatingMessage();
454 repeating_message_registered = false;
457 // cout << "not picking up comm1. :-(" << endl;
460 ////////////////////////////////////////////////////////////////////////
462 ////////////////////////////////////////////////////////////////////////
465 station = Point3D( nav1_x, nav1_y, nav1_z );
466 nav1_loc_dist = aircraft.distance3D( station );
469 station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
470 nav1_gs_dist = aircraft.distance3D( station );
476 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
477 nav1_loclat, nav1_loclon,
479 // cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
480 nav1_heading = az1 - nav1_magvar;
481 // cout << " heading = " << nav1_heading
482 // << " dist = " << nav1_dist << endl;
485 double offset = nav1_heading - nav1_radial;
486 while ( offset < -180.0 ) { offset += 360.0; }
487 while ( offset > 180.0 ) { offset -= 360.0; }
488 // cout << "ils offset = " << offset << endl;
489 nav1_effective_range = adjustILSRange(nav1_elev, elev, offset,
490 nav1_loc_dist * SG_METER_TO_NM );
492 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
494 // cout << "nav1 range = " << nav1_effective_range
495 // << " (" << nav1_range << ")" << endl;
497 if ( nav1_loc_dist < nav1_effective_range * SG_NM_TO_METER ) {
499 } else if ( nav1_loc_dist < 2 * nav1_effective_range * SG_NM_TO_METER ) {
500 nav1_inrange = sg_random() <
501 ( 2 * nav1_effective_range * SG_NM_TO_METER - nav1_loc_dist ) /
502 (nav1_effective_range * SG_NM_TO_METER);
504 nav1_inrange = false;
508 nav1_radial = nav1_sel_radial;
511 nav1_inrange = false;
512 // cout << "not picking up vor. :-(" << endl;
515 #ifdef ENABLE_AUDIO_SUPPORT
516 if ( nav1_valid && nav1_inrange ) {
517 // play station ident via audio system if on + ident,
518 // otherwise turn it off
519 if ( nav1_vol_btn > 0.1 && nav1_ident_btn ) {
520 FGSimpleSound *sound;
521 sound = globals->get_soundmgr()->find( "nav1-vor-ident" );
522 sound->set_volume( nav1_vol_btn * 0.3 );
523 sound = globals->get_soundmgr()->find( "nav1-dme-ident" );
524 sound->set_volume( nav1_vol_btn * 0.3 );
525 if ( nav1_last_time <
526 globals->get_time_params()->get_cur_time() - 30 ) {
527 nav1_last_time = globals->get_time_params()->get_cur_time();
530 if ( nav1_play_count < 4 ) {
532 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
533 globals->get_soundmgr()->play_once( "nav1-vor-ident" );
536 } else if ( nav1_play_count < 5 && nav1_has_dme ) {
538 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
539 !globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
540 globals->get_soundmgr()->play_once( "nav1-dme-ident" );
545 globals->get_soundmgr()->stop( "nav1-vor-ident" );
546 globals->get_soundmgr()->stop( "nav1-dme-ident" );
552 ////////////////////////////////////////////////////////////////////////
554 ////////////////////////////////////////////////////////////////////////
557 station = Point3D( nav2_x, nav2_y, nav2_z );
558 nav2_loc_dist = aircraft.distance3D( station );
561 station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
562 nav2_gs_dist = aircraft.distance3D( station );
568 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
569 nav2_loclat, nav2_loclon,
571 nav2_heading = az1 - nav2_magvar;
572 // cout << " heading = " << nav2_heading
573 // << " dist = " << nav2_dist << endl;
576 double offset = nav2_heading - nav2_radial;
577 while ( offset < -180.0 ) { offset += 360.0; }
578 while ( offset > 180.0 ) { offset -= 360.0; }
579 // cout << "ils offset = " << offset << endl;
580 nav2_effective_range = adjustILSRange(nav2_elev, elev, offset,
581 nav2_loc_dist * SG_METER_TO_NM );
583 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
585 // cout << "nav2 range = " << nav2_effective_range
586 // << " (" << nav2_range << ")" << endl;
588 if ( nav2_loc_dist < nav2_effective_range * SG_NM_TO_METER ) {
590 } else if ( nav2_loc_dist < 2 * nav2_effective_range * SG_NM_TO_METER ) {
591 nav2_inrange = sg_random() <
592 ( 2 * nav2_effective_range * SG_NM_TO_METER - nav2_loc_dist ) /
593 (nav2_effective_range * SG_NM_TO_METER);
595 nav2_inrange = false;
599 nav2_radial = nav2_sel_radial;
602 nav2_inrange = false;
603 // cout << "not picking up vor. :-(" << endl;
606 #ifdef ENABLE_AUDIO_SUPPORT
607 if ( nav2_valid && nav2_inrange ) {
608 // play station ident via audio system if on + ident,
609 // otherwise turn it off
610 if ( nav2_vol_btn > 0.1 && nav2_ident_btn ) {
611 FGSimpleSound *sound;
612 sound = globals->get_soundmgr()->find( "nav2-vor-ident" );
613 sound->set_volume( nav2_vol_btn * 0.3 );
614 sound = globals->get_soundmgr()->find( "nav2-dme-ident" );
615 sound->set_volume( nav2_vol_btn * 0.3 );
616 if ( nav2_last_time <
617 globals->get_time_params()->get_cur_time() - 30 ) {
618 nav2_last_time = globals->get_time_params()->get_cur_time();
621 if ( nav2_play_count < 4 ) {
623 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") ) {
624 globals->get_soundmgr()->play_once( "nav2-vor-ident" );
627 } else if ( nav2_play_count < 5 && nav2_has_dme ) {
629 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") &&
630 !globals->get_soundmgr()->is_playing("nav2-dme-ident") ) {
631 globals->get_soundmgr()->play_once( "nav2-dme-ident" );
636 globals->get_soundmgr()->stop( "nav2-vor-ident" );
637 globals->get_soundmgr()->stop( "nav2-dme-ident" );
643 ////////////////////////////////////////////////////////////////////////
645 ////////////////////////////////////////////////////////////////////////
648 station = Point3D( dme_x, dme_y, dme_z );
649 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
650 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
651 if (dme_dist < dme_effective_range * SG_NM_TO_METER) {
653 } else if (dme_dist < 2 * dme_effective_range * SG_NM_TO_METER) {
654 dme_inrange = sg_random() <
655 (2 * dme_effective_range * SG_NM_TO_METER - dme_dist) /
656 (dme_effective_range * SG_NM_TO_METER);
661 SGTimeStamp current_time;
662 station = Point3D( dme_x, dme_y, dme_z );
663 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
664 current_time.stamp();
665 long dMs = (current_time - dme_last_time) / 1000;
666 // Update every second
668 double dDist = dme_dist - dme_prev_dist;
669 dme_spd = fabs((dDist/dMs) * 3600000);
670 // FIXME: the panel should be able to
674 dme_ete = fabs((dme_dist/dme_spd) * 60.0);
675 // FIXME: the panel should be able to
679 dme_prev_dist = dme_dist;
680 dme_last_time.stamp();
690 ////////////////////////////////////////////////////////////////////////
692 ////////////////////////////////////////////////////////////////////////
695 // staightline distance
696 station = Point3D( adf_x, adf_y, adf_z );
697 adf_dist = aircraft.distance3D( station );
700 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
704 // cout << " heading = " << nav2_heading
705 // << " dist = " << nav2_dist << endl;
707 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
708 if ( adf_dist < adf_effective_range * SG_NM_TO_METER ) {
710 } else if ( adf_dist < 2 * adf_effective_range * SG_NM_TO_METER ) {
711 adf_inrange = sg_random() <
712 ( 2 * adf_effective_range * SG_NM_TO_METER - adf_dist ) /
713 (adf_effective_range * SG_NM_TO_METER);
721 #ifdef ENABLE_AUDIO_SUPPORT
722 if ( adf_valid && adf_inrange ) {
723 // play station ident via audio system if on + ident,
724 // otherwise turn it off
725 if ( adf_vol_btn > 0.1 && adf_ident_btn ) {
726 FGSimpleSound *sound;
727 sound = globals->get_soundmgr()->find( "adf-ident" );
728 sound->set_volume( adf_vol_btn * 0.3 );
730 globals->get_time_params()->get_cur_time() - 30 ) {
731 adf_last_time = globals->get_time_params()->get_cur_time();
734 if ( adf_play_count < 4 ) {
736 if ( !globals->get_soundmgr()->is_playing("adf-ident") ) {
737 globals->get_soundmgr()->play_once( "adf-ident" );
742 globals->get_soundmgr()->stop( "adf-ident" );
747 // marker beacon blinking
748 bool light_on = ( outer_blink || middle_blink || inner_blink );
752 if ( light_on && (current - blink > 400000) ) {
755 } else if ( !light_on && (current - blink > 100000) ) {
760 if ( outer_marker ) {
761 outer_blink = light_on;
766 if ( middle_marker ) {
767 middle_blink = light_on;
769 middle_blink = false;
772 if ( inner_marker ) {
773 inner_blink = light_on;
778 // cout << outer_blink << " " << middle_blink << " " << inner_blink << endl;
782 // Update current nav/adf radio stations based on current postition
783 void FGRadioStack::search()
785 static FGMkrBeacon::fgMkrBeacType last_beacon = FGMkrBeacon::NOBEACON;
787 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
788 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
789 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
791 // FIXME: the panel should handle this
792 // don't worry about overhead for now,
793 // since this is handled only periodically
794 int dme_switch_pos = fgGetInt("/panel/dme/switch-position");
795 if (dme_switch_pos == 0) {
798 } else if (dme_switch_pos == 1) {
799 if (dme_freq != nav1_freq) {
800 dme_freq = nav1_freq;
803 } else if (dme_switch_pos == 3) {
804 if (dme_freq != nav2_freq) {
805 dme_freq = nav2_freq;
813 static string last_comm1_ident = "";
814 static string last_comm2_ident = "";
815 static string last_nav1_ident = "";
816 static string last_nav2_ident = "";
817 static string last_adf_ident = "";
818 static bool last_nav1_vor = false;
819 static bool last_nav2_vor = false;
822 ////////////////////////////////////////////////////////////////////////
824 ////////////////////////////////////////////////////////////////////////
826 if ( current_atislist->query( lon, lat, elev, comm1_freq, &atis ) ) {
827 //cout << "atis found in radiostack search !!!!" << endl;
828 comm1_ident = atis.get_ident();
830 if ( last_comm1_ident != comm1_ident ) {
831 //nav1_trans_ident = ils.get_trans_ident();
832 last_comm1_ident = comm1_ident;
833 comm1_elev = atis.get_elev();
834 comm1_range = FG_ATIS_DEFAULT_RANGE;
835 comm1_effective_range = comm1_range;
836 comm1_x = atis.get_x();
837 comm1_y = atis.get_y();
838 comm1_z = atis.get_z();
839 //cout << "Found a new atis station in range" << endl;
840 //cout << " id = " << atis.get_ident() << endl;
845 //comm1_trans_ident = "";
846 last_comm1_ident = "";
847 // cout << "not picking up atis" << endl;
850 ////////////////////////////////////////////////////////////////////////
852 ////////////////////////////////////////////////////////////////////////
854 if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
855 nav1_ident = ils.get_locident();
857 if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
858 nav1_trans_ident = ils.get_trans_ident();
859 last_nav1_ident = nav1_ident;
860 last_nav1_vor = false;
862 nav1_has_dme = ils.get_has_dme();
863 nav1_has_gs = ils.get_has_gs();
865 nav1_loclon = ils.get_loclon();
866 nav1_loclat = ils.get_loclat();
867 nav1_gslon = ils.get_gslon();
868 nav1_gslat = ils.get_gslat();
869 nav1_elev = ils.get_gselev();
871 nav1_range = FG_ILS_DEFAULT_RANGE;
872 nav1_effective_range = nav1_range;
873 nav1_target_gs = ils.get_gsangle();
874 nav1_radial = ils.get_locheading();
875 while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
876 while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
877 nav1_x = ils.get_x();
878 nav1_y = ils.get_y();
879 nav1_z = ils.get_z();
880 nav1_gs_x = ils.get_gs_x();
881 nav1_gs_y = ils.get_gs_y();
882 nav1_gs_z = ils.get_gs_z();
884 #ifdef ENABLE_AUDIO_SUPPORT
885 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
886 globals->get_soundmgr()->remove( "nav1-vor-ident" );
888 FGSimpleSound *sound;
889 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
890 sound->set_volume( 0.3 );
891 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
893 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
894 globals->get_soundmgr()->remove( "nav1-dme-ident" );
896 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
897 sound->set_volume( 0.3 );
898 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
900 int offset = (int)(sg_random() * 30.0);
901 nav1_play_count = offset / 4;
902 nav1_last_time = globals->get_time_params()->get_cur_time() -
904 // cout << "offset = " << offset << " play_count = "
905 // << nav1_play_count
906 // << " nav1_last_time = " << nav1_last_time
907 // << " current time = "
908 // << globals->get_time_params()->get_cur_time() << endl;
911 // cout << "Found an ils station in range" << endl;
912 // cout << " id = " << ils.get_locident() << endl;
914 } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
915 nav1_ident = nav.get_ident();
917 if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
918 last_nav1_ident = nav1_ident;
919 last_nav1_vor = true;
920 nav1_trans_ident = nav.get_trans_ident();
922 nav1_has_dme = nav.get_has_dme();
924 nav1_loclon = nav.get_lon();
925 nav1_loclat = nav.get_lat();
926 nav1_elev = nav.get_elev();
927 nav1_magvar = nav.get_magvar();
928 nav1_range = nav.get_range();
929 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
930 nav1_target_gs = 0.0;
931 nav1_radial = nav1_sel_radial;
932 nav1_x = nav.get_x();
933 nav1_y = nav.get_y();
934 nav1_z = nav.get_z();
936 #ifdef ENABLE_AUDIO_SUPPORT
937 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
938 globals->get_soundmgr()->remove( "nav1-vor-ident" );
940 FGSimpleSound *sound;
941 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
942 sound->set_volume( 0.3 );
943 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
945 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
946 globals->get_soundmgr()->remove( "nav1-dme-ident" );
948 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
949 sound->set_volume( 0.3 );
950 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
952 int offset = (int)(sg_random() * 30.0);
953 nav1_play_count = offset / 4;
954 nav1_last_time = globals->get_time_params()->get_cur_time() -
956 // cout << "offset = " << offset << " play_count = "
957 // << nav1_play_count << " nav1_last_time = "
958 // << nav1_last_time << " current time = "
959 // << globals->get_time_params()->get_cur_time() << endl;
962 // cout << "Found a vor station in range" << endl;
963 // cout << " id = " << nav.get_ident() << endl;
969 nav1_trans_ident = "";
970 last_nav1_ident = "";
971 #ifdef ENABLE_AUDIO_SUPPORT
972 globals->get_soundmgr()->remove( "nav1-vor-ident" );
973 globals->get_soundmgr()->remove( "nav1-dme-ident" );
975 // cout << "not picking up vor1. :-(" << endl;
979 ////////////////////////////////////////////////////////////////////////
981 ////////////////////////////////////////////////////////////////////////
983 if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
984 nav2_ident = ils.get_locident();
986 if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
987 last_nav2_ident = nav2_ident;
988 last_nav2_vor = false;
989 nav2_trans_ident = ils.get_trans_ident();
991 nav2_has_dme = ils.get_has_dme();
992 nav2_has_gs = ils.get_has_gs();
994 nav2_loclon = ils.get_loclon();
995 nav2_loclat = ils.get_loclat();
996 nav2_elev = ils.get_gselev();
998 nav2_range = FG_ILS_DEFAULT_RANGE;
999 nav2_effective_range = nav2_range;
1000 nav2_target_gs = ils.get_gsangle();
1001 nav2_radial = ils.get_locheading();
1002 while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
1003 while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
1004 nav2_x = ils.get_x();
1005 nav2_y = ils.get_y();
1006 nav2_z = ils.get_z();
1007 nav2_gs_x = ils.get_gs_x();
1008 nav2_gs_y = ils.get_gs_y();
1009 nav2_gs_z = ils.get_gs_z();
1011 #ifdef ENABLE_AUDIO_SUPPORT
1012 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
1013 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1015 FGSimpleSound *sound;
1016 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
1017 sound->set_volume( 0.3 );
1018 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
1020 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
1021 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1023 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
1024 sound->set_volume( 0.3 );
1025 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
1027 int offset = (int)(sg_random() * 30.0);
1028 nav2_play_count = offset / 4;
1029 nav2_last_time = globals->get_time_params()->get_cur_time() -
1031 // cout << "offset = " << offset << " play_count = "
1032 // << nav2_play_count << " nav2_last_time = "
1033 // << nav2_last_time << " current time = "
1034 // << globals->get_time_params()->get_cur_time() << endl;
1037 // cout << "Found an ils station in range" << endl;
1038 // cout << " id = " << ils.get_locident() << endl;
1040 } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
1041 nav2_ident = nav.get_ident();
1043 if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
1044 last_nav2_ident = nav2_ident;
1045 last_nav2_vor = true;
1046 nav2_trans_ident = nav.get_trans_ident();
1048 nav2_has_dme = nav.get_has_dme();
1049 nav2_has_dme = false;
1050 nav2_loclon = nav.get_lon();
1051 nav2_loclat = nav.get_lat();
1052 nav2_elev = nav.get_elev();
1053 nav2_magvar = nav.get_magvar();
1054 nav2_range = nav.get_range();
1055 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
1056 nav2_target_gs = 0.0;
1057 nav2_radial = nav2_sel_radial;
1058 nav2_x = nav.get_x();
1059 nav2_y = nav.get_y();
1060 nav2_z = nav.get_z();
1062 #ifdef ENABLE_AUDIO_SUPPORT
1063 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
1064 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1066 FGSimpleSound *sound;
1067 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
1068 sound->set_volume( 0.3 );
1069 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
1071 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
1072 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1074 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
1075 sound->set_volume( 0.3 );
1076 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
1078 int offset = (int)(sg_random() * 30.0);
1079 nav2_play_count = offset / 4;
1080 nav2_last_time = globals->get_time_params()->get_cur_time() -
1082 // cout << "offset = " << offset << " play_count = "
1083 // << nav2_play_count << " nav2_last_time = "
1084 // << nav2_last_time << " current time = "
1085 // << globals->get_time_params()->get_cur_time() << endl;
1088 // cout << "Found a vor station in range" << endl;
1089 // cout << " id = " << nav.get_ident() << endl;
1095 nav2_trans_ident = "";
1096 last_nav2_ident = "";
1097 #ifdef ENABLE_AUDIO_SUPPORT
1098 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1099 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1101 // cout << "not picking up vor1. :-(" << endl;
1105 ////////////////////////////////////////////////////////////////////////
1107 ////////////////////////////////////////////////////////////////////////
1109 if ( current_ilslist->query( lon, lat, elev, dme_freq, &ils ) ) {
1110 if (ils.get_has_dme()) {
1112 dme_lon = ils.get_loclon();
1113 dme_lat = ils.get_loclat();
1114 dme_elev = ils.get_gselev();
1115 dme_range = FG_ILS_DEFAULT_RANGE;
1116 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1117 dme_x = ils.get_dme_x();
1118 dme_y = ils.get_dme_y();
1119 dme_z = ils.get_dme_z();
1121 } else if ( current_navlist->query( lon, lat, elev, dme_freq, &nav ) ) {
1122 if (nav.get_has_dme()) {
1124 dme_lon = nav.get_lon();
1125 dme_lat = nav.get_lat();
1126 dme_elev = nav.get_elev();
1127 dme_range = nav.get_range();
1128 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1129 dme_x = nav.get_x();
1130 dme_y = nav.get_y();
1131 dme_z = nav.get_z();
1139 ////////////////////////////////////////////////////////////////////////
1141 ////////////////////////////////////////////////////////////////////////
1143 FGMkrBeacon::fgMkrBeacType beacon_type
1144 = current_beacons->query( lon * SGD_RADIANS_TO_DEGREES,
1145 lat * SGD_RADIANS_TO_DEGREES, elev );
1147 outer_marker = middle_marker = inner_marker = false;
1149 if ( beacon_type == FGMkrBeacon::OUTER ) {
1150 outer_marker = true;
1151 // cout << "OUTER MARKER" << endl;
1152 #ifdef ENABLE_AUDIO_SUPPORT
1153 if ( last_beacon != FGMkrBeacon::OUTER ) {
1154 if ( ! globals->get_soundmgr()->exists( "outer-marker" ) ) {
1155 FGSimpleSound *sound = beacon.get_outer();
1156 sound->set_volume( 0.3 );
1157 globals->get_soundmgr()->add( sound, "outer-marker" );
1159 if ( !globals->get_soundmgr()->is_playing("outer-marker") ) {
1160 globals->get_soundmgr()->play_looped( "outer-marker" );
1164 } else if ( beacon_type == FGMkrBeacon::MIDDLE ) {
1165 middle_marker = true;
1166 // cout << "MIDDLE MARKER" << endl;
1167 #ifdef ENABLE_AUDIO_SUPPORT
1168 if ( last_beacon != FGMkrBeacon::MIDDLE ) {
1169 if ( ! globals->get_soundmgr()->exists( "middle-marker" ) ) {
1170 FGSimpleSound *sound = beacon.get_middle();
1171 sound->set_volume( 0.3 );
1172 globals->get_soundmgr()->add( sound, "middle-marker" );
1174 if ( !globals->get_soundmgr()->is_playing("middle-marker") ) {
1175 globals->get_soundmgr()->play_looped( "middle-marker" );
1179 } else if ( beacon_type == FGMkrBeacon::INNER ) {
1180 inner_marker = true;
1181 // cout << "INNER MARKER" << endl;
1182 #ifdef ENABLE_AUDIO_SUPPORT
1183 if ( last_beacon != FGMkrBeacon::INNER ) {
1184 if ( ! globals->get_soundmgr()->exists( "inner-marker" ) ) {
1185 FGSimpleSound *sound = beacon.get_inner();
1186 sound->set_volume( 0.3 );
1187 globals->get_soundmgr()->add( sound, "inner-marker" );
1189 if ( !globals->get_soundmgr()->is_playing("inner-marker") ) {
1190 globals->get_soundmgr()->play_looped( "inner-marker" );
1195 // cout << "no marker" << endl;
1196 #ifdef ENABLE_AUDIO_SUPPORT
1197 globals->get_soundmgr()->stop( "outer-marker" );
1198 globals->get_soundmgr()->stop( "middle-marker" );
1199 globals->get_soundmgr()->stop( "inner-marker" );
1202 last_beacon = beacon_type;
1205 ////////////////////////////////////////////////////////////////////////
1207 ////////////////////////////////////////////////////////////////////////
1209 if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
1211 #if defined( _MSC_VER ) || defined(__MINGW32__)
1212 _snprintf( freq, 10, "%.0f", adf_freq );
1214 snprintf( freq, 10, "%.0f", adf_freq );
1217 adf_ident += nav.get_ident();
1218 // cout << "adf ident = " << adf_ident << endl;
1220 if ( last_adf_ident != adf_ident ) {
1221 last_adf_ident = adf_ident;
1223 adf_trans_ident = nav.get_trans_ident();
1224 adf_lon = nav.get_lon();
1225 adf_lat = nav.get_lat();
1226 adf_elev = nav.get_elev();
1227 adf_range = nav.get_range();
1228 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
1229 adf_x = nav.get_x();
1230 adf_y = nav.get_y();
1231 adf_z = nav.get_z();
1233 #ifdef ENABLE_AUDIO_SUPPORT
1234 if ( globals->get_soundmgr()->exists( "adf-ident" ) ) {
1235 globals->get_soundmgr()->remove( "adf-ident" );
1237 FGSimpleSound *sound;
1238 sound = morse.make_ident( adf_trans_ident, LO_FREQUENCY );
1239 sound->set_volume( 0.3 );
1240 globals->get_soundmgr()->add( sound, "adf-ident" );
1242 int offset = (int)(sg_random() * 30.0);
1243 adf_play_count = offset / 4;
1244 adf_last_time = globals->get_time_params()->get_cur_time() -
1246 // cout << "offset = " << offset << " play_count = "
1247 // << adf_play_count << " adf_last_time = "
1248 // << adf_last_time << " current time = "
1249 // << globals->get_time_params()->get_cur_time() << endl;
1252 // cout << "Found an adf station in range" << endl;
1253 // cout << " id = " << nav.get_ident() << endl;
1258 adf_trans_ident = "";
1259 #ifdef ENABLE_AUDIO_SUPPORT
1260 globals->get_soundmgr()->remove( "adf-ident" );
1262 last_adf_ident = "";
1263 // cout << "not picking up adf. :-(" << endl;
1268 // return the amount of heading needle deflection, returns a value
1269 // clamped to the range of ( -10 , 10 )
1270 double FGRadioStack::get_nav1_heading_needle_deflection() const {
1273 if ( nav1_inrange ) {
1274 r = nav1_heading - nav1_radial;
1275 // cout << "Radial = " << nav1_radial
1276 // << " Bearing = " << nav1_heading << endl;
1278 while ( r > 180.0 ) { r -= 360.0;}
1279 while ( r < -180.0 ) { r += 360.0;}
1280 if ( fabs(r) > 90.0 ) {
1281 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1287 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1288 if ( nav1_loc ) { r *= 4.0; }
1289 if ( r < -10.0 ) { r = -10.0; }
1290 if ( r > 10.0 ) { r = 10.0; }
1298 // return the amount of heading needle deflection, returns a value
1299 // clamped to the range of ( -10 , 10 )
1300 double FGRadioStack::get_nav2_heading_needle_deflection() const {
1303 if ( nav2_inrange ) {
1304 r = nav2_heading - nav2_radial;
1305 // cout << "Radial = " << nav2_radial
1306 // << " Bearing = " << nav2_heading << endl;
1308 while (r> 180.0) r-=360.0;
1309 while (r<-180.0) r+=360.0;
1310 if ( fabs(r) > 90.0 )
1311 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1312 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1313 if ( nav2_loc ) r *= 4.0;
1314 if ( r < -10.0 ) r = -10.0;
1315 if ( r > 10.0 ) r = 10.0;
1323 // return the amount of glide slope needle deflection (.i.e. the
1324 // number of degrees we are off the glide slope * 5.0
1325 double FGRadioStack::get_nav1_gs_needle_deflection() const {
1326 if ( nav1_inrange && nav1_has_gs ) {
1327 double x = nav1_gs_dist;
1328 double y = (fgGetDouble("/position/altitude-ft") - nav1_elev)
1330 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1331 return (nav1_target_gs - angle) * 5.0;
1338 // return the amount of glide slope needle deflection (.i.e. the
1339 // number of degrees we are off the glide slope * 5.0
1340 double FGRadioStack::get_nav2_gs_needle_deflection() const {
1341 if ( nav2_inrange && nav2_has_gs ) {
1342 double x = nav2_gs_dist;
1343 double y = (fgGetDouble("/position/altitude-ft") - nav2_elev)
1345 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1346 return (nav2_target_gs - angle) * 5.0;
1354 * Return true if the NAV1 TO flag should be active.
1357 FGRadioStack::get_nav1_to_flag () const
1360 double offset = fabs(nav1_heading - nav1_radial);
1364 return (offset <= 90.0 || offset >= 270.0);
1372 * Return true if the NAV1 FROM flag should be active.
1375 FGRadioStack::get_nav1_from_flag () const
1378 double offset = fabs(nav1_heading - nav1_radial);
1382 return (offset > 90.0 && offset < 270.0);
1390 * Return true if the NAV2 TO flag should be active.
1393 FGRadioStack::get_nav2_to_flag () const
1396 double offset = fabs(nav2_heading - nav2_radial);
1400 return (offset <= 90.0 || offset >= 270.0);
1408 * Return true if the NAV2 FROM flag should be active.
1411 FGRadioStack::get_nav2_from_flag () const
1414 double offset = fabs(nav2_heading - nav2_radial);
1418 return (offset > 90.0 && offset < 270.0);