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 <stdio.h> // snprintf
30 #include <simgear/compiler.h>
31 #include <simgear/math/sg_random.h>
33 #include <Aircraft/aircraft.hxx>
34 #include <ATC/ATCdisplay.hxx>
35 //#include <Navaids/atis.hxx>
36 #include <Navaids/ilslist.hxx>
37 #include <Navaids/mkrbeacons.hxx>
38 #include <Navaids/navlist.hxx>
39 #include <Time/event.hxx>
41 #include "radiostack.hxx"
46 static int nav1_play_count = 0;
47 static int nav2_play_count = 0;
48 static int adf_play_count = 0;
49 static time_t nav1_last_time = 0;
50 static time_t nav2_last_time = 0;
51 static time_t adf_last_time = 0;
54 FGRadioStack *current_radiostack;
58 * Boy, this is ugly! Make the VOR range vary by altitude difference.
60 static double kludgeRange ( double stationElev, double aircraftElev,
63 // Assume that the nominal range (usually
64 // 50nm) applies at a 5,000 ft difference.
66 double factor = ((aircraftElev*SG_METER_TO_FEET) - stationElev) / 5000.0;
67 double range = fabs(nominalRange * factor);
69 // Clamp the range to keep it sane; for
70 // now, never less than 25% or more than
71 // 500% of nominal range.
72 if (range < nominalRange/4.0) {
73 range = nominalRange/4.0;
74 } else if (range > nominalRange*5.0) {
75 range = nominalRange*5.0;
82 // periodic radio station search wrapper
83 static void fgRadioSearch( void ) {
84 current_radiostack->search();
88 FGRadioStack::FGRadioStack() :
89 lon_node(fgGetNode("/position/longitude-deg", true)),
90 lat_node(fgGetNode("/position/latitude-deg", true)),
91 alt_node(fgGetNode("/position/altitude-ft", true)),
111 SGPath path( globals->get_fg_root() );
113 term.append( "Navaids/range.term" );
115 low.append( "Navaids/range.low" );
117 high.append( "Navaids/range.high" );
119 term_tbl = new SGInterpTable( term.str() );
120 low_tbl = new SGInterpTable( low.str() );
121 high_tbl = new SGInterpTable( high.str() );
122 dme_last_time.stamp();
127 FGRadioStack::~FGRadioStack()
129 unbind(); // FIXME: should be called externally
138 FGRadioStack::init ()
145 update(1); // FIXME: use dt
147 // Search radio database once per second
148 global_events.Register( "fgRadioSearch()", fgRadioSearch,
149 fgEVENT::FG_EVENT_READY, 1000);
153 FGRadioStack::bind ()
156 fgTie("/radios/comm[0]/frequencies/selected-mhz", this,
157 &FGRadioStack::get_comm1_freq, &FGRadioStack::set_comm1_freq);
158 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
159 fgTie("/radios/comm[0]/frequencies/standby-mhz", this,
160 &FGRadioStack::get_comm1_alt_freq, &FGRadioStack::set_comm1_alt_freq);
161 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
162 fgTie("/radios/comm[0]/volume", this,
163 &FGRadioStack::get_comm1_vol_btn,
164 &FGRadioStack::set_comm1_vol_btn);
165 fgSetArchivable("/radios/comm[0]/volume");
166 fgTie("/radios/comm[0]/ident", this,
167 &FGRadioStack::get_comm1_ident_btn,
168 &FGRadioStack::set_comm1_ident_btn);
169 fgSetArchivable("/radios/comm[0]/ident");
171 fgTie("/radios/comm[1]/frequencies/selected-mhz", this,
172 &FGRadioStack::get_comm2_freq, &FGRadioStack::set_comm2_freq);
173 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
174 fgTie("/radios/comm[1]/frequencies/standby-mhz", this,
175 &FGRadioStack::get_comm2_alt_freq, &FGRadioStack::set_comm2_alt_freq);
176 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
177 fgTie("/radios/comm[1]/volume", this,
178 &FGRadioStack::get_comm2_vol_btn,
179 &FGRadioStack::set_comm2_vol_btn);
180 fgSetArchivable("/radios/comm[0]/volume");
181 fgTie("/radios/comm[1]/ident", this,
182 &FGRadioStack::get_comm2_ident_btn,
183 &FGRadioStack::set_comm2_ident_btn);
184 fgSetArchivable("/radios/comm[1]/ident");
186 fgTie("/radios/nav[0]/frequencies/selected-mhz", this,
187 &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
188 fgSetArchivable("/radios/nav[0]/frequencies/selected-mhz");
189 fgTie("/radios/nav[0]/frequencies/standby-mhz", this,
190 &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
191 fgSetArchivable("/radios/nav[0]/frequencies/standby-mhz");
192 fgTie("/radios/nav[0]/radials/selected-deg", this,
193 &FGRadioStack::get_nav1_sel_radial,
194 &FGRadioStack::set_nav1_sel_radial);
195 fgSetArchivable("/radios/nav[0]/radials/selected-deg");
196 fgTie("/radios/nav[0]/volume", this,
197 &FGRadioStack::get_nav1_vol_btn,
198 &FGRadioStack::set_nav1_vol_btn);
199 fgSetArchivable("/radios/nav[0]/volume");
200 fgTie("/radios/nav[0]/ident", this,
201 &FGRadioStack::get_nav1_ident_btn,
202 &FGRadioStack::set_nav1_ident_btn);
203 fgSetArchivable("/radios/nav[0]/ident");
206 fgTie("/radios/nav[0]/radials/actual-deg", this,
207 &FGRadioStack::get_nav1_radial);
208 fgTie("/radios/nav[0]/to-flag", this, &FGRadioStack::get_nav1_to_flag);
209 fgTie("/radios/nav[0]/from-flag", this, &FGRadioStack::get_nav1_from_flag);
210 fgTie("/radios/nav[0]/in-range", this, &FGRadioStack::get_nav1_inrange);
211 fgTie("/radios/nav[0]/heading-needle-deflection", this,
212 &FGRadioStack::get_nav1_heading_needle_deflection);
213 fgTie("/radios/nav[0]/gs-needle-deflection", this,
214 &FGRadioStack::get_nav1_gs_needle_deflection);
217 fgTie("/radios/nav[1]/frequencies/selected-mhz", this,
218 &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
219 fgSetArchivable("/radios/nav[1]/frequencies/selected-mhz");
220 fgTie("/radios/nav[1]/frequencies/standby-mhz", this,
221 &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
222 fgSetArchivable("/radios/nav[1]/frequencies/standby-mhz");
223 fgTie("/radios/nav[1]/radials/selected-deg", this,
224 &FGRadioStack::get_nav2_sel_radial,
225 &FGRadioStack::set_nav2_sel_radial);
226 fgSetArchivable("/radios/nav[1]/radials/selected-deg");
227 fgTie("/radios/nav[1]/volume", this,
228 &FGRadioStack::get_nav2_vol_btn,
229 &FGRadioStack::set_nav2_vol_btn);
230 fgSetArchivable("/radios/nav[1]/volume");
231 fgTie("/radios/nav[1]/ident", this,
232 &FGRadioStack::get_nav2_ident_btn,
233 &FGRadioStack::set_nav2_ident_btn);
234 fgSetArchivable("/radios/nav[1]/ident");
237 fgTie("/radios/nav[1]/radials/actual-deg", this,
238 &FGRadioStack::get_nav2_radial);
239 fgTie("/radios/nav[1]/to-flag", this, &FGRadioStack::get_nav2_to_flag);
240 fgTie("/radios/nav[1]/from-flag", this, &FGRadioStack::get_nav2_from_flag);
241 fgTie("/radios/nav[1]/in-range", this, &FGRadioStack::get_nav2_inrange);
242 fgTie("/radios/nav[1]/heading-needle-deflection", this,
243 &FGRadioStack::get_nav2_heading_needle_deflection);
244 fgTie("/radios/nav[1]/gs-needle-deflection", this,
245 &FGRadioStack::get_nav2_gs_needle_deflection);
248 fgTie("/radios/dme/frequencies/selected-khz", this,
249 &FGRadioStack::get_dme_freq, &FGRadioStack::set_dme_freq);
252 fgTie("/radios/dme/in-range", this, &FGRadioStack::get_dme_inrange);
253 fgTie("/radios/dme/distance-nm", this, &FGRadioStack::get_dme_dist);
254 fgTie("/radios/dme/speed-kt", this, &FGRadioStack::get_dme_spd);
255 fgTie("/radios/dme/ete-min", this, &FGRadioStack::get_dme_ete);
258 fgTie("/radios/adf/frequencies/selected-khz", this,
259 &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
260 fgSetArchivable("/radios/adf/frequencies/selected-khz");
261 fgTie("/radios/adf/frequencies/standby-khz", this,
262 &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
263 fgSetArchivable("/radios/adf/frequencies/standby-khz");
264 fgTie("/radios/adf/rotation-deg", this,
265 &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
266 fgSetArchivable("/radios/adf/rotation-deg");
267 fgTie("/radios/adf/volume", this,
268 &FGRadioStack::get_adf_vol_btn,
269 &FGRadioStack::set_adf_vol_btn);
270 fgSetArchivable("/radios/adf/volume");
271 fgTie("/radios/adf/ident", this,
272 &FGRadioStack::get_adf_ident_btn,
273 &FGRadioStack::set_adf_ident_btn);
274 fgSetArchivable("/radios/adf/ident");
276 fgTie("/radios/marker-beacon/inner", this,
277 &FGRadioStack::get_inner_blink);
278 fgTie("/radios/marker-beacon/middle", this,
279 &FGRadioStack::get_middle_blink);
280 fgTie("/radios/marker-beacon/outer", this,
281 &FGRadioStack::get_outer_blink);
285 FGRadioStack::unbind ()
287 fgUntie("/radios/comm[0]/frequencies/selected-mhz");
288 fgUntie("/radios/comm[0]/frequencies/standby-mhz");
289 fgUntie("/radios/comm[0]/on");
290 fgUntie("/radios/comm[0]/ident");
292 fgUntie("/radios/comm[1]/frequencies/selected-mhz");
293 fgUntie("/radios/comm[1]/frequencies/standby-mhz");
294 fgUntie("/radios/comm[1]/on");
295 fgUntie("/radios/comm[1]/ident");
297 fgUntie("/radios/nav[0]/frequencies/selected-mhz");
298 fgUntie("/radios/nav[0]/frequencies/standby-mhz");
299 fgUntie("/radios/nav[0]/radials/actual-deg");
300 fgUntie("/radios/nav[0]/radials/selected-deg");
301 fgUntie("/radios/nav[0]/on");
302 fgUntie("/radios/nav[0]/ident");
303 fgUntie("/radios/nav[0]/to-flag");
304 fgUntie("/radios/nav[0]/from-flag");
305 fgUntie("/radios/nav[0]/in-range");
306 fgUntie("/radios/nav[0]/heading-needle-deflection");
307 fgUntie("/radios/nav[0]/gs-needle-deflection");
309 fgUntie("/radios/nav[1]/frequencies/selected-mhz");
310 fgUntie("/radios/nav[1]/frequencies/standby-mhz");
311 fgUntie("/radios/nav[1]/radials/actual-deg");
312 fgUntie("/radios/nav[1]/radials/selected-deg");
313 fgUntie("/radios/nav[1]/on");
314 fgUntie("/radios/nav[1]/ident");
315 fgUntie("/radios/nav[1]/to-flag");
316 fgUntie("/radios/nav[1]/from-flag");
317 fgUntie("/radios/nav[1]/in-range");
318 fgUntie("/radios/nav[1]/heading-needle-deflection");
319 fgUntie("/radios/nav[1]/gs-needle-deflection");
321 fgUntie("/radios/dme/frequencies/selected-khz");
324 fgUntie("/radios/dme/in-range");
325 fgUntie("/radios/dme/distance-nm");
326 fgUntie("/radios/dme/speed-kt");
327 fgUntie("/radios/dme/ete-min");
329 fgUntie("/radios/adf/frequencies/selected-khz");
330 fgUntie("/radios/adf/frequencies/standby-khz");
331 fgUntie("/radios/adf/rotation-deg");
332 fgUntie("/radios/adf/on");
333 fgUntie("/radios/adf/ident");
335 fgUntie("/radios/marker-beacon/inner");
336 fgUntie("/radios/marker-beacon/middle");
337 fgUntie("/radios/marker-beacon/outer");
341 // model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
342 double FGRadioStack::adjustNavRange( double stationElev, double aircraftElev,
343 double nominalRange )
345 // extend out actual usable range to be 1.3x the published safe range
346 const double usability_factor = 1.3;
348 // assumptions we model the standard service volume, plus
349 // ... rather than specifying a cylinder, we model a cone that
350 // contains the cylinder. Then we put an upside down cone on top
351 // to model diminishing returns at too-high altitudes.
353 // altitude difference
354 double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
355 // cout << "aircraft elev = " << aircraftElev * SG_METER_TO_FEET
356 // << " station elev = " << stationElev << endl;
358 if ( nominalRange < 25.0 + SG_EPSILON ) {
359 // Standard Terminal Service Volume
360 return term_tbl->interpolate( alt ) * usability_factor;
361 } else if ( nominalRange < 50.0 + SG_EPSILON ) {
362 // Standard Low Altitude Service Volume
363 // table is based on range of 40, scale to actual range
364 return low_tbl->interpolate( alt ) * nominalRange / 40.0
367 // Standard High Altitude Service Volume
368 // table is based on range of 130, scale to actual range
369 return high_tbl->interpolate( alt ) * nominalRange / 130.0
375 // model standard ILS service volumes as per AIM 1-1-9
376 double FGRadioStack::adjustILSRange( double stationElev, double aircraftElev,
377 double offsetDegrees, double distance )
379 // assumptions we model the standard service volume, plus
381 // altitude difference
382 // double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
383 double offset = fabs( offsetDegrees );
386 return FG_ILS_DEFAULT_RANGE;
387 } else if ( offset < 35 ) {
388 return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
389 } else if ( offset < 45 ) {
390 return (45 - offset);
391 } else if ( offset > 170 ) {
392 return FG_ILS_DEFAULT_RANGE;
393 } else if ( offset > 145 ) {
394 return 10 + (offset - 145) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
395 } else if ( offset > 135 ) {
396 return (offset - 135);
403 // Update the various nav values based on position and valid tuned in navs
405 FGRadioStack::update(int dt)
410 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
411 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
412 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
416 Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
420 ////////////////////////////////////////////////////////////////////////
422 ////////////////////////////////////////////////////////////////////////
424 static bool repeating_message_registered = false;
425 static int dcl_i = 0; //Hack to only call the transmission now and then - should use the event scheduler
427 station = Point3D( comm1_x, comm1_y, comm1_z );
428 comm1_dist = aircraft.distance3D( station );
429 if ( comm1_dist < comm1_effective_range * SG_NM_TO_METER ) {
430 comm1_inrange = true;
431 // TODO - only get the transmission and register every now and then
433 transmission = atis.get_transmission();
434 current_atcdisplay->ChangeRepeatingMessage(transmission);
436 if(!repeating_message_registered) {
437 current_atcdisplay->RegisterRepeatingMessage(transmission);
438 repeating_message_registered = true;
445 comm1_inrange = false;
446 if(repeating_message_registered) {
447 current_atcdisplay->CancelRepeatingMessage();
448 repeating_message_registered = false;
453 comm1_inrange = false;
454 if(repeating_message_registered) {
455 current_atcdisplay->CancelRepeatingMessage();
456 repeating_message_registered = false;
459 // cout << "not picking up comm1. :-(" << endl;
462 ////////////////////////////////////////////////////////////////////////
464 ////////////////////////////////////////////////////////////////////////
467 station = Point3D( nav1_x, nav1_y, nav1_z );
468 nav1_loc_dist = aircraft.distance3D( station );
471 station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
472 nav1_gs_dist = aircraft.distance3D( station );
478 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
479 nav1_loclat, nav1_loclon,
481 // cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
482 nav1_heading = az1 - nav1_magvar;
483 // cout << " heading = " << nav1_heading
484 // << " dist = " << nav1_dist << endl;
487 double offset = nav1_heading - nav1_radial;
488 while ( offset < -180.0 ) { offset += 360.0; }
489 while ( offset > 180.0 ) { offset -= 360.0; }
490 // cout << "ils offset = " << offset << endl;
491 nav1_effective_range = adjustILSRange(nav1_elev, elev, offset,
492 nav1_loc_dist * SG_METER_TO_NM );
494 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
496 // cout << "nav1 range = " << nav1_effective_range
497 // << " (" << nav1_range << ")" << endl;
499 if ( nav1_loc_dist < nav1_effective_range * SG_NM_TO_METER ) {
501 } else if ( nav1_loc_dist < 2 * nav1_effective_range * SG_NM_TO_METER ) {
502 nav1_inrange = sg_random() <
503 ( 2 * nav1_effective_range * SG_NM_TO_METER - nav1_loc_dist ) /
504 (nav1_effective_range * SG_NM_TO_METER);
506 nav1_inrange = false;
510 nav1_radial = nav1_sel_radial;
513 nav1_inrange = false;
514 // cout << "not picking up vor. :-(" << endl;
517 #ifdef ENABLE_AUDIO_SUPPORT
518 if ( nav1_valid && nav1_inrange ) {
519 // play station ident via audio system if on + ident,
520 // otherwise turn it off
521 if ( nav1_vol_btn > 0.1 && nav1_ident_btn ) {
522 FGSimpleSound *sound;
523 sound = globals->get_soundmgr()->find( "nav1-vor-ident" );
524 sound->set_volume( nav1_vol_btn * 0.3 );
525 sound = globals->get_soundmgr()->find( "nav1-dme-ident" );
526 sound->set_volume( nav1_vol_btn * 0.3 );
527 if ( nav1_last_time <
528 globals->get_time_params()->get_cur_time() - 30 ) {
529 nav1_last_time = globals->get_time_params()->get_cur_time();
532 if ( nav1_play_count < 4 ) {
534 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
535 globals->get_soundmgr()->play_once( "nav1-vor-ident" );
538 } else if ( nav1_play_count < 5 && nav1_has_dme ) {
540 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
541 !globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
542 globals->get_soundmgr()->play_once( "nav1-dme-ident" );
547 globals->get_soundmgr()->stop( "nav1-vor-ident" );
548 globals->get_soundmgr()->stop( "nav1-dme-ident" );
554 ////////////////////////////////////////////////////////////////////////
556 ////////////////////////////////////////////////////////////////////////
559 station = Point3D( nav2_x, nav2_y, nav2_z );
560 nav2_loc_dist = aircraft.distance3D( station );
563 station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
564 nav2_gs_dist = aircraft.distance3D( station );
570 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
571 nav2_loclat, nav2_loclon,
573 nav2_heading = az1 - nav2_magvar;
574 // cout << " heading = " << nav2_heading
575 // << " dist = " << nav2_dist << endl;
578 double offset = nav2_heading - nav2_radial;
579 while ( offset < -180.0 ) { offset += 360.0; }
580 while ( offset > 180.0 ) { offset -= 360.0; }
581 // cout << "ils offset = " << offset << endl;
582 nav2_effective_range = adjustILSRange(nav2_elev, elev, offset,
583 nav2_loc_dist * SG_METER_TO_NM );
585 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
587 // cout << "nav2 range = " << nav2_effective_range
588 // << " (" << nav2_range << ")" << endl;
590 if ( nav2_loc_dist < nav2_effective_range * SG_NM_TO_METER ) {
592 } else if ( nav2_loc_dist < 2 * nav2_effective_range * SG_NM_TO_METER ) {
593 nav2_inrange = sg_random() <
594 ( 2 * nav2_effective_range * SG_NM_TO_METER - nav2_loc_dist ) /
595 (nav2_effective_range * SG_NM_TO_METER);
597 nav2_inrange = false;
601 nav2_radial = nav2_sel_radial;
604 nav2_inrange = false;
605 // cout << "not picking up vor. :-(" << endl;
608 #ifdef ENABLE_AUDIO_SUPPORT
609 if ( nav2_valid && nav2_inrange ) {
610 // play station ident via audio system if on + ident,
611 // otherwise turn it off
612 if ( nav2_vol_btn > 0.1 && nav2_ident_btn ) {
613 FGSimpleSound *sound;
614 sound = globals->get_soundmgr()->find( "nav2-vor-ident" );
615 sound->set_volume( nav2_vol_btn * 0.3 );
616 sound = globals->get_soundmgr()->find( "nav2-dme-ident" );
617 sound->set_volume( nav2_vol_btn * 0.3 );
618 if ( nav2_last_time <
619 globals->get_time_params()->get_cur_time() - 30 ) {
620 nav2_last_time = globals->get_time_params()->get_cur_time();
623 if ( nav2_play_count < 4 ) {
625 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") ) {
626 globals->get_soundmgr()->play_once( "nav2-vor-ident" );
629 } else if ( nav2_play_count < 5 && nav2_has_dme ) {
631 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") &&
632 !globals->get_soundmgr()->is_playing("nav2-dme-ident") ) {
633 globals->get_soundmgr()->play_once( "nav2-dme-ident" );
638 globals->get_soundmgr()->stop( "nav2-vor-ident" );
639 globals->get_soundmgr()->stop( "nav2-dme-ident" );
645 ////////////////////////////////////////////////////////////////////////
647 ////////////////////////////////////////////////////////////////////////
650 station = Point3D( dme_x, dme_y, dme_z );
651 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
652 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
653 if (dme_dist < dme_effective_range * SG_NM_TO_METER) {
655 } else if (dme_dist < 2 * dme_effective_range * SG_NM_TO_METER) {
656 dme_inrange = sg_random() <
657 (2 * dme_effective_range * SG_NM_TO_METER - dme_dist) /
658 (dme_effective_range * SG_NM_TO_METER);
663 SGTimeStamp current_time;
664 station = Point3D( dme_x, dme_y, dme_z );
665 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
666 current_time.stamp();
667 long dMs = (current_time - dme_last_time) / 1000;
668 // Update every second
670 double dDist = dme_dist - dme_prev_dist;
671 dme_spd = fabs((dDist/dMs) * 3600000);
672 // FIXME: the panel should be able to
676 dme_ete = fabs((dme_dist/dme_spd) * 60.0);
677 // FIXME: the panel should be able to
681 dme_prev_dist = dme_dist;
682 dme_last_time.stamp();
692 ////////////////////////////////////////////////////////////////////////
694 ////////////////////////////////////////////////////////////////////////
697 // staightline distance
698 station = Point3D( adf_x, adf_y, adf_z );
699 adf_dist = aircraft.distance3D( station );
702 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
706 // cout << " heading = " << nav2_heading
707 // << " dist = " << nav2_dist << endl;
709 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
710 if ( adf_dist < adf_effective_range * SG_NM_TO_METER ) {
712 } else if ( adf_dist < 2 * adf_effective_range * SG_NM_TO_METER ) {
713 adf_inrange = sg_random() <
714 ( 2 * adf_effective_range * SG_NM_TO_METER - adf_dist ) /
715 (adf_effective_range * SG_NM_TO_METER);
723 #ifdef ENABLE_AUDIO_SUPPORT
724 if ( adf_valid && adf_inrange ) {
725 // play station ident via audio system if on + ident,
726 // otherwise turn it off
727 if ( adf_vol_btn > 0.1 && adf_ident_btn ) {
728 FGSimpleSound *sound;
729 sound = globals->get_soundmgr()->find( "adf-ident" );
730 sound->set_volume( adf_vol_btn * 0.3 );
732 globals->get_time_params()->get_cur_time() - 30 ) {
733 adf_last_time = globals->get_time_params()->get_cur_time();
736 if ( adf_play_count < 4 ) {
738 if ( !globals->get_soundmgr()->is_playing("adf-ident") ) {
739 globals->get_soundmgr()->play_once( "adf-ident" );
744 globals->get_soundmgr()->stop( "adf-ident" );
749 // marker beacon blinking
750 bool light_on = ( outer_blink || middle_blink || inner_blink );
754 if ( light_on && (current - blink > 400000) ) {
757 } else if ( !light_on && (current - blink > 100000) ) {
762 if ( outer_marker ) {
763 outer_blink = light_on;
768 if ( middle_marker ) {
769 middle_blink = light_on;
771 middle_blink = false;
774 if ( inner_marker ) {
775 inner_blink = light_on;
780 // cout << outer_blink << " " << middle_blink << " " << inner_blink << endl;
784 // Update current nav/adf radio stations based on current postition
785 void FGRadioStack::search()
787 static FGMkrBeacon::fgMkrBeacType last_beacon = FGMkrBeacon::NOBEACON;
789 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
790 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
791 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
793 // FIXME: the panel should handle this
794 // don't worry about overhead for now,
795 // since this is handled only periodically
796 int dme_switch_pos = fgGetInt("/radios/dme/switch-position");
797 if (dme_switch_pos == 0) {
800 } else if (dme_switch_pos == 1) {
801 if (dme_freq != nav1_freq) {
802 dme_freq = nav1_freq;
805 } else if (dme_switch_pos == 3) {
806 if (dme_freq != nav2_freq) {
807 dme_freq = nav2_freq;
815 static string last_comm1_ident = "";
816 static string last_comm2_ident = "";
817 static string last_nav1_ident = "";
818 static string last_nav2_ident = "";
819 static string last_adf_ident = "";
820 static bool last_nav1_vor = false;
821 static bool last_nav2_vor = false;
824 ////////////////////////////////////////////////////////////////////////
826 ////////////////////////////////////////////////////////////////////////
828 if ( current_atislist->query( lon, lat, elev, comm1_freq, &atis ) ) {
829 //cout << "atis found in radiostack search !!!!" << endl;
830 comm1_ident = atis.get_ident();
832 if ( last_comm1_ident != comm1_ident ) {
833 //nav1_trans_ident = ils.get_trans_ident();
834 last_comm1_ident = comm1_ident;
835 comm1_elev = atis.get_elev();
836 comm1_range = FG_ATIS_DEFAULT_RANGE;
837 comm1_effective_range = comm1_range;
838 comm1_x = atis.get_x();
839 comm1_y = atis.get_y();
840 comm1_z = atis.get_z();
841 //cout << "Found a new atis station in range" << endl;
842 //cout << " id = " << atis.get_ident() << endl;
847 //comm1_trans_ident = "";
848 last_comm1_ident = "";
849 // cout << "not picking up atis" << endl;
852 ////////////////////////////////////////////////////////////////////////
854 ////////////////////////////////////////////////////////////////////////
856 if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
857 nav1_ident = ils.get_locident();
859 if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
860 nav1_trans_ident = ils.get_trans_ident();
861 last_nav1_ident = nav1_ident;
862 last_nav1_vor = false;
864 nav1_has_dme = ils.get_has_dme();
865 nav1_has_gs = ils.get_has_gs();
867 nav1_loclon = ils.get_loclon();
868 nav1_loclat = ils.get_loclat();
869 nav1_gslon = ils.get_gslon();
870 nav1_gslat = ils.get_gslat();
871 nav1_elev = ils.get_gselev();
873 nav1_range = FG_ILS_DEFAULT_RANGE;
874 nav1_effective_range = nav1_range;
875 nav1_target_gs = ils.get_gsangle();
876 nav1_radial = ils.get_locheading();
877 while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
878 while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
879 nav1_x = ils.get_x();
880 nav1_y = ils.get_y();
881 nav1_z = ils.get_z();
882 nav1_gs_x = ils.get_gs_x();
883 nav1_gs_y = ils.get_gs_y();
884 nav1_gs_z = ils.get_gs_z();
886 #ifdef ENABLE_AUDIO_SUPPORT
887 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
888 globals->get_soundmgr()->remove( "nav1-vor-ident" );
890 FGSimpleSound *sound;
891 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
892 sound->set_volume( 0.3 );
893 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
895 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
896 globals->get_soundmgr()->remove( "nav1-dme-ident" );
898 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
899 sound->set_volume( 0.3 );
900 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
902 int offset = (int)(sg_random() * 30.0);
903 nav1_play_count = offset / 4;
904 nav1_last_time = globals->get_time_params()->get_cur_time() -
906 // cout << "offset = " << offset << " play_count = "
907 // << nav1_play_count
908 // << " nav1_last_time = " << nav1_last_time
909 // << " current time = "
910 // << globals->get_time_params()->get_cur_time() << endl;
913 // cout << "Found an ils station in range" << endl;
914 // cout << " id = " << ils.get_locident() << endl;
916 } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
917 nav1_ident = nav.get_ident();
919 if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
920 last_nav1_ident = nav1_ident;
921 last_nav1_vor = true;
922 nav1_trans_ident = nav.get_trans_ident();
924 nav1_has_dme = nav.get_has_dme();
926 nav1_loclon = nav.get_lon();
927 nav1_loclat = nav.get_lat();
928 nav1_elev = nav.get_elev();
929 nav1_magvar = nav.get_magvar();
930 nav1_range = nav.get_range();
931 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
932 nav1_target_gs = 0.0;
933 nav1_radial = nav1_sel_radial;
934 nav1_x = nav.get_x();
935 nav1_y = nav.get_y();
936 nav1_z = nav.get_z();
938 #ifdef ENABLE_AUDIO_SUPPORT
939 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
940 globals->get_soundmgr()->remove( "nav1-vor-ident" );
942 FGSimpleSound *sound;
943 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
944 sound->set_volume( 0.3 );
945 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
947 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
948 globals->get_soundmgr()->remove( "nav1-dme-ident" );
950 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
951 sound->set_volume( 0.3 );
952 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
954 int offset = (int)(sg_random() * 30.0);
955 nav1_play_count = offset / 4;
956 nav1_last_time = globals->get_time_params()->get_cur_time() -
958 // cout << "offset = " << offset << " play_count = "
959 // << nav1_play_count << " nav1_last_time = "
960 // << nav1_last_time << " current time = "
961 // << globals->get_time_params()->get_cur_time() << endl;
964 // cout << "Found a vor station in range" << endl;
965 // cout << " id = " << nav.get_ident() << endl;
971 nav1_trans_ident = "";
972 last_nav1_ident = "";
973 #ifdef ENABLE_AUDIO_SUPPORT
974 globals->get_soundmgr()->remove( "nav1-vor-ident" );
975 globals->get_soundmgr()->remove( "nav1-dme-ident" );
977 // cout << "not picking up vor1. :-(" << endl;
981 ////////////////////////////////////////////////////////////////////////
983 ////////////////////////////////////////////////////////////////////////
985 if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
986 nav2_ident = ils.get_locident();
988 if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
989 last_nav2_ident = nav2_ident;
990 last_nav2_vor = false;
991 nav2_trans_ident = ils.get_trans_ident();
993 nav2_has_dme = ils.get_has_dme();
994 nav2_has_gs = ils.get_has_gs();
996 nav2_loclon = ils.get_loclon();
997 nav2_loclat = ils.get_loclat();
998 nav2_elev = ils.get_gselev();
1000 nav2_range = FG_ILS_DEFAULT_RANGE;
1001 nav2_effective_range = nav2_range;
1002 nav2_target_gs = ils.get_gsangle();
1003 nav2_radial = ils.get_locheading();
1004 while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
1005 while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
1006 nav2_x = ils.get_x();
1007 nav2_y = ils.get_y();
1008 nav2_z = ils.get_z();
1009 nav2_gs_x = ils.get_gs_x();
1010 nav2_gs_y = ils.get_gs_y();
1011 nav2_gs_z = ils.get_gs_z();
1013 #ifdef ENABLE_AUDIO_SUPPORT
1014 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
1015 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1017 FGSimpleSound *sound;
1018 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
1019 sound->set_volume( 0.3 );
1020 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
1022 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
1023 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1025 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
1026 sound->set_volume( 0.3 );
1027 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
1029 int offset = (int)(sg_random() * 30.0);
1030 nav2_play_count = offset / 4;
1031 nav2_last_time = globals->get_time_params()->get_cur_time() -
1033 // cout << "offset = " << offset << " play_count = "
1034 // << nav2_play_count << " nav2_last_time = "
1035 // << nav2_last_time << " current time = "
1036 // << globals->get_time_params()->get_cur_time() << endl;
1039 // cout << "Found an ils station in range" << endl;
1040 // cout << " id = " << ils.get_locident() << endl;
1042 } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
1043 nav2_ident = nav.get_ident();
1045 if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
1046 last_nav2_ident = nav2_ident;
1047 last_nav2_vor = true;
1048 nav2_trans_ident = nav.get_trans_ident();
1050 nav2_has_dme = nav.get_has_dme();
1051 nav2_has_dme = false;
1052 nav2_loclon = nav.get_lon();
1053 nav2_loclat = nav.get_lat();
1054 nav2_elev = nav.get_elev();
1055 nav2_magvar = nav.get_magvar();
1056 nav2_range = nav.get_range();
1057 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
1058 nav2_target_gs = 0.0;
1059 nav2_radial = nav2_sel_radial;
1060 nav2_x = nav.get_x();
1061 nav2_y = nav.get_y();
1062 nav2_z = nav.get_z();
1064 #ifdef ENABLE_AUDIO_SUPPORT
1065 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
1066 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1068 FGSimpleSound *sound;
1069 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
1070 sound->set_volume( 0.3 );
1071 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
1073 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
1074 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1076 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
1077 sound->set_volume( 0.3 );
1078 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
1080 int offset = (int)(sg_random() * 30.0);
1081 nav2_play_count = offset / 4;
1082 nav2_last_time = globals->get_time_params()->get_cur_time() -
1084 // cout << "offset = " << offset << " play_count = "
1085 // << nav2_play_count << " nav2_last_time = "
1086 // << nav2_last_time << " current time = "
1087 // << globals->get_time_params()->get_cur_time() << endl;
1090 // cout << "Found a vor station in range" << endl;
1091 // cout << " id = " << nav.get_ident() << endl;
1097 nav2_trans_ident = "";
1098 last_nav2_ident = "";
1099 #ifdef ENABLE_AUDIO_SUPPORT
1100 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1101 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1103 // cout << "not picking up vor1. :-(" << endl;
1107 ////////////////////////////////////////////////////////////////////////
1109 ////////////////////////////////////////////////////////////////////////
1111 if ( current_ilslist->query( lon, lat, elev, dme_freq, &ils ) ) {
1112 if (ils.get_has_dme()) {
1114 dme_lon = ils.get_loclon();
1115 dme_lat = ils.get_loclat();
1116 dme_elev = ils.get_gselev();
1117 dme_range = FG_ILS_DEFAULT_RANGE;
1118 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1119 dme_x = ils.get_dme_x();
1120 dme_y = ils.get_dme_y();
1121 dme_z = ils.get_dme_z();
1123 } else if ( current_navlist->query( lon, lat, elev, dme_freq, &nav ) ) {
1124 if (nav.get_has_dme()) {
1126 dme_lon = nav.get_lon();
1127 dme_lat = nav.get_lat();
1128 dme_elev = nav.get_elev();
1129 dme_range = nav.get_range();
1130 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1131 dme_x = nav.get_x();
1132 dme_y = nav.get_y();
1133 dme_z = nav.get_z();
1141 ////////////////////////////////////////////////////////////////////////
1143 ////////////////////////////////////////////////////////////////////////
1145 FGMkrBeacon::fgMkrBeacType beacon_type
1146 = current_beacons->query( lon * SGD_RADIANS_TO_DEGREES,
1147 lat * SGD_RADIANS_TO_DEGREES, elev );
1149 outer_marker = middle_marker = inner_marker = false;
1151 if ( beacon_type == FGMkrBeacon::OUTER ) {
1152 outer_marker = true;
1153 // cout << "OUTER MARKER" << endl;
1154 #ifdef ENABLE_AUDIO_SUPPORT
1155 if ( last_beacon != FGMkrBeacon::OUTER ) {
1156 if ( ! globals->get_soundmgr()->exists( "outer-marker" ) ) {
1157 FGSimpleSound *sound = beacon.get_outer();
1158 sound->set_volume( 0.3 );
1159 globals->get_soundmgr()->add( sound, "outer-marker" );
1161 if ( !globals->get_soundmgr()->is_playing("outer-marker") ) {
1162 globals->get_soundmgr()->play_looped( "outer-marker" );
1166 } else if ( beacon_type == FGMkrBeacon::MIDDLE ) {
1167 middle_marker = true;
1168 // cout << "MIDDLE MARKER" << endl;
1169 #ifdef ENABLE_AUDIO_SUPPORT
1170 if ( last_beacon != FGMkrBeacon::MIDDLE ) {
1171 if ( ! globals->get_soundmgr()->exists( "middle-marker" ) ) {
1172 FGSimpleSound *sound = beacon.get_middle();
1173 sound->set_volume( 0.3 );
1174 globals->get_soundmgr()->add( sound, "middle-marker" );
1176 if ( !globals->get_soundmgr()->is_playing("middle-marker") ) {
1177 globals->get_soundmgr()->play_looped( "middle-marker" );
1181 } else if ( beacon_type == FGMkrBeacon::INNER ) {
1182 inner_marker = true;
1183 // cout << "INNER MARKER" << endl;
1184 #ifdef ENABLE_AUDIO_SUPPORT
1185 if ( last_beacon != FGMkrBeacon::INNER ) {
1186 if ( ! globals->get_soundmgr()->exists( "inner-marker" ) ) {
1187 FGSimpleSound *sound = beacon.get_inner();
1188 sound->set_volume( 0.3 );
1189 globals->get_soundmgr()->add( sound, "inner-marker" );
1191 if ( !globals->get_soundmgr()->is_playing("inner-marker") ) {
1192 globals->get_soundmgr()->play_looped( "inner-marker" );
1197 // cout << "no marker" << endl;
1198 #ifdef ENABLE_AUDIO_SUPPORT
1199 globals->get_soundmgr()->stop( "outer-marker" );
1200 globals->get_soundmgr()->stop( "middle-marker" );
1201 globals->get_soundmgr()->stop( "inner-marker" );
1204 last_beacon = beacon_type;
1207 ////////////////////////////////////////////////////////////////////////
1209 ////////////////////////////////////////////////////////////////////////
1211 if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
1213 #if defined( _MSC_VER ) || defined(__MINGW32__)
1214 _snprintf( freq, 10, "%.0f", adf_freq );
1216 snprintf( freq, 10, "%.0f", adf_freq );
1219 adf_ident += nav.get_ident();
1220 // cout << "adf ident = " << adf_ident << endl;
1222 if ( last_adf_ident != adf_ident ) {
1223 last_adf_ident = adf_ident;
1225 adf_trans_ident = nav.get_trans_ident();
1226 adf_lon = nav.get_lon();
1227 adf_lat = nav.get_lat();
1228 adf_elev = nav.get_elev();
1229 adf_range = nav.get_range();
1230 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
1231 adf_x = nav.get_x();
1232 adf_y = nav.get_y();
1233 adf_z = nav.get_z();
1235 #ifdef ENABLE_AUDIO_SUPPORT
1236 if ( globals->get_soundmgr()->exists( "adf-ident" ) ) {
1237 globals->get_soundmgr()->remove( "adf-ident" );
1239 FGSimpleSound *sound;
1240 sound = morse.make_ident( adf_trans_ident, LO_FREQUENCY );
1241 sound->set_volume( 0.3 );
1242 globals->get_soundmgr()->add( sound, "adf-ident" );
1244 int offset = (int)(sg_random() * 30.0);
1245 adf_play_count = offset / 4;
1246 adf_last_time = globals->get_time_params()->get_cur_time() -
1248 // cout << "offset = " << offset << " play_count = "
1249 // << adf_play_count << " adf_last_time = "
1250 // << adf_last_time << " current time = "
1251 // << globals->get_time_params()->get_cur_time() << endl;
1254 // cout << "Found an adf station in range" << endl;
1255 // cout << " id = " << nav.get_ident() << endl;
1260 adf_trans_ident = "";
1261 #ifdef ENABLE_AUDIO_SUPPORT
1262 globals->get_soundmgr()->remove( "adf-ident" );
1264 last_adf_ident = "";
1265 // cout << "not picking up adf. :-(" << endl;
1270 // return the amount of heading needle deflection, returns a value
1271 // clamped to the range of ( -10 , 10 )
1272 double FGRadioStack::get_nav1_heading_needle_deflection() const {
1275 if ( nav1_inrange ) {
1276 r = nav1_heading - nav1_radial;
1277 // cout << "Radial = " << nav1_radial
1278 // << " Bearing = " << nav1_heading << endl;
1280 while ( r > 180.0 ) { r -= 360.0;}
1281 while ( r < -180.0 ) { r += 360.0;}
1282 if ( fabs(r) > 90.0 ) {
1283 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1289 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1290 if ( nav1_loc ) { r *= 4.0; }
1291 if ( r < -10.0 ) { r = -10.0; }
1292 if ( r > 10.0 ) { r = 10.0; }
1300 // return the amount of heading needle deflection, returns a value
1301 // clamped to the range of ( -10 , 10 )
1302 double FGRadioStack::get_nav2_heading_needle_deflection() const {
1305 if ( nav2_inrange ) {
1306 r = nav2_heading - nav2_radial;
1307 // cout << "Radial = " << nav2_radial
1308 // << " Bearing = " << nav2_heading << endl;
1310 while (r> 180.0) r-=360.0;
1311 while (r<-180.0) r+=360.0;
1312 if ( fabs(r) > 90.0 )
1313 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1314 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1315 if ( nav2_loc ) r *= 4.0;
1316 if ( r < -10.0 ) r = -10.0;
1317 if ( r > 10.0 ) r = 10.0;
1325 // return the amount of glide slope needle deflection (.i.e. the
1326 // number of degrees we are off the glide slope * 5.0
1327 double FGRadioStack::get_nav1_gs_needle_deflection() const {
1328 if ( nav1_inrange && nav1_has_gs ) {
1329 double x = nav1_gs_dist;
1330 double y = (fgGetDouble("/position/altitude-ft") - nav1_elev)
1332 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1333 return (nav1_target_gs - angle) * 5.0;
1340 // return the amount of glide slope needle deflection (.i.e. the
1341 // number of degrees we are off the glide slope * 5.0
1342 double FGRadioStack::get_nav2_gs_needle_deflection() const {
1343 if ( nav2_inrange && nav2_has_gs ) {
1344 double x = nav2_gs_dist;
1345 double y = (fgGetDouble("/position/altitude-ft") - nav2_elev)
1347 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1348 return (nav2_target_gs - angle) * 5.0;
1356 * Return true if the NAV1 TO flag should be active.
1359 FGRadioStack::get_nav1_to_flag () const
1362 double offset = fabs(nav1_heading - nav1_radial);
1366 return (offset <= 90.0 || offset >= 270.0);
1374 * Return true if the NAV1 FROM flag should be active.
1377 FGRadioStack::get_nav1_from_flag () const
1380 double offset = fabs(nav1_heading - nav1_radial);
1384 return (offset > 90.0 && offset < 270.0);
1392 * Return true if the NAV2 TO flag should be active.
1395 FGRadioStack::get_nav2_to_flag () const
1398 double offset = fabs(nav2_heading - nav2_radial);
1402 return (offset <= 90.0 || offset >= 270.0);
1410 * Return true if the NAV2 FROM flag should be active.
1413 FGRadioStack::get_nav2_from_flag () const
1416 double offset = fabs(nav2_heading - nav2_radial);
1420 return (offset > 90.0 && offset < 270.0);