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.
24 #include <simgear/math/sg_random.h>
26 #include <Aircraft/aircraft.hxx>
27 #include <Main/bfi.hxx>
28 #include <Navaids/ilslist.hxx>
29 #include <Navaids/navlist.hxx>
30 #include <Time/event.hxx>
32 #include "radiostack.hxx"
34 static int nav1_play_count = 0;
35 static time_t nav1_last_time = 0;
38 FGRadioStack *current_radiostack;
42 * Boy, this is ugly! Make the VOR range vary by altitude difference.
44 static double kludgeRange ( double stationElev, double aircraftElev,
47 // Assume that the nominal range (usually
48 // 50nm) applies at a 5,000 ft difference.
50 double factor = ((aircraftElev*METER_TO_FEET) - stationElev) / 5000.0;
51 double range = fabs(nominalRange * factor);
53 // Clamp the range to keep it sane; for
54 // now, never less than 25% or more than
55 // 500% of nominal range.
56 if (range < nominalRange/4.0) {
57 range = nominalRange/4.0;
58 } else if (range > nominalRange*5.0) {
59 range = nominalRange*5.0;
66 // periodic radio station search wrapper
67 static void fgRadioSearch( void ) {
68 current_radiostack->search();
72 FGRadioStack::FGRadioStack() {
78 longitudeVal = fgGetValue("/position/longitude");
79 latitudeVal = fgGetValue("/position/latitude");
80 altitudeVal = fgGetValue("/position/altitude");
85 FGRadioStack::~FGRadioStack()
87 unbind(); // FIXME: should be called externally
99 FGPath path( globals->get_fg_root() );
101 term.append( "Navaids/range.term" );
103 low.append( "Navaids/range.low" );
105 high.append( "Navaids/range.high" );
107 term_tbl = new SGInterpTable( term.str() );
108 low_tbl = new SGInterpTable( low.str() );
109 high_tbl = new SGInterpTable( high.str() );
111 // Search radio database once per second
112 global_events.Register( "fgRadioSearch()", fgRadioSearch,
113 fgEVENT::FG_EVENT_READY, 1000);
117 FGRadioStack::bind ()
120 fgTie("/radios/nav1/frequencies/selected", this,
121 &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
122 fgTie("/radios/nav1/frequencies/standby", this,
123 &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
124 fgTie("/radios/nav1/radials/selected", this,
125 &FGRadioStack::get_nav1_sel_radial,
126 &FGRadioStack::set_nav1_sel_radial);
127 fgTie("/radios/nav1/on", this,
128 &FGRadioStack::get_nav1_on_btn,
129 &FGRadioStack::set_nav1_on_btn);
130 fgTie("/radios/nav1/ident", this,
131 &FGRadioStack::get_nav1_ident_btn,
132 &FGRadioStack::set_nav1_ident_btn);
135 fgTie("/radios/nav1/radials/actual", this, &FGRadioStack::get_nav1_radial);
136 fgTie("/radios/nav1/to-flag", this, &FGRadioStack::get_nav1_to_flag);
137 fgTie("/radios/nav1/from-flag", this, &FGRadioStack::get_nav1_from_flag);
138 fgTie("/radios/nav1/in-range", this, &FGRadioStack::get_nav1_inrange);
139 fgTie("/radios/nav1/dme/distance", this, &FGRadioStack::get_nav1_dme_dist);
140 fgTie("/radios/nav1/dme/in-range", this,
141 &FGRadioStack::get_nav1_dme_inrange);
142 fgTie("/radios/nav1/heading-needle-deflection", this,
143 &FGRadioStack::get_nav1_heading_needle_deflection);
144 fgTie("/radios/nav1/gs-needle-deflection", this,
145 &FGRadioStack::get_nav1_gs_needle_deflection);
148 fgTie("/radios/nav2/frequencies/selected", this,
149 &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
150 fgTie("/radios/nav2/frequencies/standby", this,
151 &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
152 fgTie("/radios/nav2/radials/selected", this,
153 &FGRadioStack::get_nav2_sel_radial,
154 &FGRadioStack::set_nav2_sel_radial);
155 fgTie("/radios/nav2/on", this,
156 &FGRadioStack::get_nav2_on_btn,
157 &FGRadioStack::set_nav2_on_btn);
158 fgTie("/radios/nav2/ident", this,
159 &FGRadioStack::get_nav2_ident_btn,
160 &FGRadioStack::set_nav2_ident_btn);
163 fgTie("/radios/nav2/radials/actual", this, &FGRadioStack::get_nav2_radial);
164 fgTie("/radios/nav2/to-flag", this, &FGRadioStack::get_nav2_to_flag);
165 fgTie("/radios/nav2/from-flag", this, &FGRadioStack::get_nav2_from_flag);
166 fgTie("/radios/nav2/in-range", this, &FGRadioStack::get_nav2_inrange);
167 fgTie("/radios/nav2/dme/distance", this, &FGRadioStack::get_nav2_dme_dist);
168 fgTie("/radios/nav2/dme/in-range", this,
169 &FGRadioStack::get_nav2_dme_inrange);
170 fgTie("/radios/nav2/heading-needle-deflection", this,
171 &FGRadioStack::get_nav2_heading_needle_deflection);
172 fgTie("/radios/nav2/gs-needle-deflection", this,
173 &FGRadioStack::get_nav2_gs_needle_deflection);
176 fgTie("/radios/adf/frequencies/selected", this,
177 &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
178 fgTie("/radios/adf/frequencies/standby", this,
179 &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
180 fgTie("/radios/adf/rotation", this,
181 &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
185 FGRadioStack::unbind ()
187 fgUntie("/radios/nav1/frequencies/selected");
188 fgUntie("/radios/nav1/frequencies/standby");
189 fgUntie("/radios/nav1/radials/actual");
190 fgUntie("/radios/nav1/radials/selected");
191 fgUntie("/radios/nav1/on");
192 fgUntie("/radios/nav1/ident");
193 fgUntie("/radios/nav1/to-flag");
194 fgUntie("/radios/nav1/from-flag");
195 fgUntie("/radios/nav1/in-range");
196 fgUntie("/radios/nav1/dme/distance");
197 fgUntie("/radios/nav1/dme/in-range");
198 fgUntie("/radios/nav1/heading-needle-deflection");
199 fgUntie("/radios/nav1/gs-needle-deflection");
201 fgUntie("/radios/nav2/frequencies/selected");
202 fgUntie("/radios/nav2/frequencies/standby");
203 fgUntie("/radios/nav2/radials/actual");
204 fgUntie("/radios/nav2/radials/selected");
205 fgUntie("/radios/nav2/on");
206 fgUntie("/radios/nav2/ident");
207 fgUntie("/radios/nav2/to-flag");
208 fgUntie("/radios/nav2/from-flag");
209 fgUntie("/radios/nav2/in-range");
210 fgUntie("/radios/nav2/dme/distance");
211 fgUntie("/radios/nav2/dme/in-range");
212 fgUntie("/radios/nav2/heading-needle-deflection");
213 fgUntie("/radios/nav2/gs-needle-deflection");
215 fgUntie("/radios/adf/frequencies/selected");
216 fgUntie("/radios/adf/frequencies/standby");
217 fgUntie("/radios/adf/rotation");
221 // model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
222 double FGRadioStack::adjustNavRange( double stationElev, double aircraftElev,
223 double nominalRange )
225 // assumptions we model the standard service volume, plus
226 // ... rather than specifying a cylinder, we model a cone that
227 // contains the cylinder. Then we put an upside down cone on top
228 // to model diminishing returns at too-high altitudes.
230 // altitude difference
231 double alt = ( aircraftElev * METER_TO_FEET - stationElev );
232 // cout << "aircraft elev = " << aircraftElev * METER_TO_FEET
233 // << " station elev = " << stationElev << endl;
235 if ( nominalRange < 25.0 + FG_EPSILON ) {
236 // Standard Terminal Service Volume
237 return term_tbl->interpolate( alt );
238 } else if ( nominalRange < 50.0 + FG_EPSILON ) {
239 // Standard Low Altitude Service Volume
240 // table is based on range of 40, scale to actual range
241 return low_tbl->interpolate( alt ) * nominalRange / 40.0;
243 // Standard High Altitude Service Volume
244 // table is based on range of 130, scale to actual range
245 return high_tbl->interpolate( alt ) * nominalRange / 130.0;
250 // model standard ILS service volumes as per AIM 1-1-9
251 double FGRadioStack::adjustILSRange( double stationElev, double aircraftElev,
252 double offsetDegrees, double distance )
254 // assumptions we model the standard service volume, plus
256 // altitude difference
257 // double alt = ( aircraftElev * METER_TO_FEET - stationElev );
258 double offset = fabs( offsetDegrees );
261 return FG_ILS_DEFAULT_RANGE;
262 } else if ( offset < 35 ) {
263 return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
264 } else if ( offset < 45 ) {
265 return (45 - offset);
272 // Update the various nav values based on position and valid tuned in navs
274 FGRadioStack::update()
276 double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
277 double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
278 double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
282 Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
287 station = Point3D( nav1_x, nav1_y, nav1_z );
288 nav1_loc_dist = aircraft.distance3D( station );
290 if ( nav1_has_dme ) {
291 // staightline distance
292 station = Point3D( nav1_dme_x, nav1_dme_y, nav1_dme_z );
293 nav1_dme_dist = aircraft.distance3D( station );
299 station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
300 nav1_gs_dist = aircraft.distance3D( station );
306 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
307 nav1_loclat, nav1_loclon,
309 // cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
310 nav1_heading = az1 - nav1_magvar;
311 // cout << " heading = " << nav1_heading
312 // << " dist = " << nav1_dist << endl;
315 double offset = nav1_heading - nav1_radial;
316 while ( offset < -180.0 ) { offset += 360.0; }
317 while ( offset > 180.0 ) { offset -= 360.0; }
318 cout << "ils offset = " << offset << endl;
319 nav1_effective_range = adjustILSRange(nav1_elev, elev, offset,
320 nav1_loc_dist * METER_TO_NM );
322 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
324 cout << "nav1 range = " << nav1_effective_range
325 << " (" << nav1_range << ")" << endl;
327 if ( nav1_loc_dist < nav1_effective_range * NM_TO_METER ) {
329 } else if ( nav1_loc_dist < 2 * nav1_effective_range * NM_TO_METER ) {
330 nav1_inrange = sg_random() <
331 ( 2 * nav1_effective_range * NM_TO_METER - nav1_loc_dist ) /
332 (nav1_effective_range * NM_TO_METER);
334 nav1_inrange = false;
338 nav1_radial = nav1_sel_radial;
341 nav1_inrange = false;
343 // cout << "not picking up vor. :-(" << endl;
346 if ( nav1_valid && nav1_inrange ) {
347 // play station ident via audio system if on + ident,
348 // otherwise turn it off
349 if ( nav1_on_btn && nav1_ident_btn ) {
350 if ( nav1_last_time <
351 globals->get_time_params()->get_cur_time() - 30 ) {
352 nav1_last_time = globals->get_time_params()->get_cur_time();
355 if ( nav1_play_count < 4 ) {
357 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
358 globals->get_soundmgr()->play_once( "nav1-vor-ident" );
361 } else if ( nav1_play_count < 5 && nav1_has_dme ) {
363 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
364 !globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
365 globals->get_soundmgr()->play_once( "nav1-dme-ident" );
370 globals->get_soundmgr()->stop( "nav1-vor-ident" );
371 globals->get_soundmgr()->stop( "nav1-dme-ident" );
376 station = Point3D( nav2_x, nav2_y, nav2_z );
377 nav2_loc_dist = aircraft.distance3D( station );
379 if ( nav2_has_dme ) {
380 // staightline distance
381 station = Point3D( nav2_dme_x, nav2_dme_y, nav2_dme_z );
382 nav2_dme_dist = aircraft.distance3D( station );
388 station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
389 nav2_gs_dist = aircraft.distance3D( station );
395 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
396 nav2_loclat, nav2_loclon,
398 nav2_heading = az1 - nav2_magvar;
399 // cout << " heading = " << nav2_heading
400 // << " dist = " << nav2_dist << endl;
403 double offset = nav2_heading - nav2_radial;
404 while ( offset < -180.0 ) { offset += 360.0; }
405 while ( offset > 180.0 ) { offset -= 360.0; }
406 cout << "ils offset = " << offset << endl;
407 nav2_effective_range = adjustILSRange(nav2_elev, elev, offset,
408 nav2_loc_dist * METER_TO_NM );
410 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
412 cout << "nav2 range = " << nav2_effective_range
413 << " (" << nav2_range << ")" << endl;
415 if ( nav2_loc_dist < nav2_effective_range * NM_TO_METER ) {
417 } else if ( nav2_loc_dist < 2 * nav2_effective_range * NM_TO_METER ) {
418 nav2_inrange = sg_random() <
419 ( 2 * nav2_effective_range * NM_TO_METER - nav2_loc_dist ) /
420 (nav2_effective_range * NM_TO_METER);
422 nav2_inrange = false;
426 nav2_radial = nav2_sel_radial;
429 nav2_inrange = false;
431 // cout << "not picking up vor. :-(" << endl;
436 // staightline distance
437 station = Point3D( adf_x, adf_y, adf_z );
438 adf_dist = aircraft.distance3D( station );
441 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
445 // cout << " heading = " << nav2_heading
446 // << " dist = " << nav2_dist << endl;
448 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
449 if ( adf_dist < adf_effective_range * NM_TO_METER ) {
451 } else if ( adf_dist < 2 * adf_effective_range * NM_TO_METER ) {
452 adf_inrange = sg_random() <
453 ( 2 * adf_effective_range * NM_TO_METER - adf_dist ) /
454 (adf_effective_range * NM_TO_METER);
464 // Update current nav/adf radio stations based on current postition
465 void FGRadioStack::search()
467 double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
468 double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
469 double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
475 static string last_nav1_ident = "";
476 static string last_nav2_ident = "";
477 static bool last_nav1_vor = false;
478 static bool last_nav2_vor = false;
479 if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
480 nav1_ident = ils.get_locident();
481 if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
482 nav1_trans_ident = ils.get_trans_ident();
483 last_nav1_ident = nav1_ident;
484 last_nav1_vor = false;
487 nav1_has_dme = ils.get_has_dme();
488 nav1_has_gs = ils.get_has_gs();
490 nav1_loclon = ils.get_loclon();
491 nav1_loclat = ils.get_loclat();
492 nav1_gslon = ils.get_gslon();
493 nav1_gslat = ils.get_gslat();
494 nav1_dmelon = ils.get_dmelon();
495 nav1_dmelat = ils.get_dmelat();
496 nav1_elev = ils.get_gselev();
498 nav1_range = FG_ILS_DEFAULT_RANGE;
499 nav1_effective_range = nav1_range;
500 nav1_target_gs = ils.get_gsangle();
501 nav1_radial = ils.get_locheading();
502 while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
503 while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
504 nav1_x = ils.get_x();
505 nav1_y = ils.get_y();
506 nav1_z = ils.get_z();
507 nav1_gs_x = ils.get_gs_x();
508 nav1_gs_y = ils.get_gs_y();
509 nav1_gs_z = ils.get_gs_z();
510 nav1_dme_x = ils.get_dme_x();
511 nav1_dme_y = ils.get_dme_y();
512 nav1_dme_z = ils.get_dme_z();
514 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
515 globals->get_soundmgr()->remove( "nav1-vor-ident" );
517 FGSimpleSound *sound;
518 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
519 sound->set_volume( 0.3 );
520 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
522 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
523 globals->get_soundmgr()->remove( "nav1-dme-ident" );
525 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
526 sound->set_volume( 0.3 );
527 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
529 int offset = (int)(sg_random() * 30.0);
530 nav1_play_count = offset / 4;
531 nav1_last_time = globals->get_time_params()->get_cur_time() -
533 cout << "offset = " << offset << " play_count = " << nav1_play_count
534 << " nav1_last_time = " << nav1_last_time << " current time = "
535 << globals->get_time_params()->get_cur_time() << endl;
537 cout << "Found an ils station in range" << endl;
538 cout << " id = " << ils.get_locident() << endl;
540 } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
541 nav1_ident = nav.get_ident();
542 if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
543 last_nav1_ident = nav1_ident;
544 last_nav1_vor = true;
545 nav1_trans_ident = nav.get_trans_ident();
548 nav1_has_dme = nav.get_has_dme();
550 nav1_loclon = nav.get_lon();
551 nav1_loclat = nav.get_lat();
552 nav1_elev = nav.get_elev();
553 nav1_magvar = nav.get_magvar();
554 nav1_range = nav.get_range();
555 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
556 nav1_target_gs = 0.0;
557 nav1_radial = nav1_sel_radial;
558 nav1_x = nav1_dme_x = nav.get_x();
559 nav1_y = nav1_dme_y = nav.get_y();
560 nav1_z = nav1_dme_z = nav.get_z();
562 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
563 globals->get_soundmgr()->remove( "nav1-vor-ident" );
565 FGSimpleSound *sound;
566 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
567 sound->set_volume( 0.3 );
568 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
570 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
571 globals->get_soundmgr()->remove( "nav1-dme-ident" );
573 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
574 sound->set_volume( 0.3 );
575 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
577 int offset = (int)(sg_random() * 30.0);
578 nav1_play_count = offset / 4;
579 nav1_last_time = globals->get_time_params()->get_cur_time() -
581 cout << "offset = " << offset << " play_count = " << nav1_play_count
582 << " nav1_last_time = " << nav1_last_time << " current time = "
583 << globals->get_time_params()->get_cur_time() << endl;
585 cout << "Found a vor station in range" << endl;
586 cout << " id = " << nav.get_ident() << endl;
593 globals->get_soundmgr()->remove( "nav1-vor-ident" );
594 globals->get_soundmgr()->remove( "nav1-dme-ident" );
595 cout << "not picking up vor1. :-(" << endl;
598 if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
599 nav2_ident = ils.get_locident();
600 if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
601 last_nav2_ident = nav2_ident;
602 last_nav2_vor = false;
603 nav2_trans_ident = ils.get_trans_ident();
606 nav2_has_dme = ils.get_has_dme();
607 nav2_has_gs = ils.get_has_gs();
609 nav2_loclon = ils.get_loclon();
610 nav2_loclat = ils.get_loclat();
611 nav2_elev = ils.get_gselev();
613 nav2_range = FG_ILS_DEFAULT_RANGE;
614 nav2_effective_range = nav2_range;
615 nav2_target_gs = ils.get_gsangle();
616 nav2_radial = ils.get_locheading();
617 while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
618 while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
619 nav2_x = ils.get_x();
620 nav2_y = ils.get_y();
621 nav2_z = ils.get_z();
622 nav2_gs_x = ils.get_gs_x();
623 nav2_gs_y = ils.get_gs_y();
624 nav2_gs_z = ils.get_gs_z();
625 nav2_dme_x = ils.get_dme_x();
626 nav2_dme_y = ils.get_dme_y();
627 nav2_dme_z = ils.get_dme_z();
628 // cout << "Found an ils station in range" << endl;
629 // cout << " id = " << ils.get_locident() << endl;
631 } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
632 nav2_ident = nav.get_ident();
633 if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
634 last_nav2_ident = nav2_ident;
635 last_nav2_vor = true;
636 nav2_trans_ident = nav.get_trans_ident();
639 nav2_has_dme = nav.get_has_dme();
640 nav2_has_dme = false;
641 nav2_loclon = nav.get_lon();
642 nav2_loclat = nav.get_lat();
643 nav2_elev = nav.get_elev();
644 nav2_magvar = nav.get_magvar();
645 nav2_range = nav.get_range();
646 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
647 nav2_target_gs = 0.0;
648 nav2_radial = nav2_sel_radial;
649 nav2_x = nav2_dme_x = nav.get_x();
650 nav2_y = nav2_dme_y = nav.get_y();
651 nav2_z = nav2_dme_z = nav.get_z();
652 // cout << "Found a vor station in range" << endl;
653 // cout << " id = " << nav.get_ident() << endl;
660 // cout << "not picking up vor2. :-(" << endl;
664 if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
667 adf_lon = nav.get_lon();
668 adf_lat = nav.get_lat();
669 adf_elev = nav.get_elev();
670 adf_range = nav.get_range();
671 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
675 // cout << "Found an adf station in range" << endl;
676 // cout << " id = " << nav.get_ident() << endl;
679 // cout << "not picking up adf. :-(" << endl;
684 // return the amount of heading needle deflection, returns a value
685 // clamped to the range of ( -10 , 10 )
686 double FGRadioStack::get_nav1_heading_needle_deflection() const {
689 if ( nav1_inrange ) {
690 r = nav1_heading - nav1_radial;
691 // cout << "Radial = " << nav1_radial
692 // << " Bearing = " << nav1_heading << endl;
694 while ( r > 180.0 ) { r -= 360.0;}
695 while ( r < -180.0 ) { r += 360.0;}
696 if ( fabs(r) > 90.0 ) {
697 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
703 // According to Robin Peel, the ILS is 4x more sensitive than a vor
704 if ( nav1_loc ) { r *= 4.0; }
705 if ( r < -10.0 ) { r = -10.0; }
706 if ( r > 10.0 ) { r = 10.0; }
714 // return the amount of heading needle deflection, returns a value
715 // clamped to the range of ( -10 , 10 )
716 double FGRadioStack::get_nav2_heading_needle_deflection() const {
719 if ( nav2_inrange ) {
720 r = nav2_heading - nav2_radial;
721 // cout << "Radial = " << nav2_radial
722 // << " Bearing = " << nav2_heading << endl;
724 while (r> 180.0) r-=360.0;
725 while (r<-180.0) r+=360.0;
726 if ( fabs(r) > 90.0 )
727 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
728 // According to Robin Peel, the ILS is 4x more sensitive than a vor
729 if ( nav2_loc ) r *= 4.0;
730 if ( r < -10.0 ) r = -10.0;
731 if ( r > 10.0 ) r = 10.0;
739 // return the amount of glide slope needle deflection (.i.e. the
740 // number of degrees we are off the glide slope * 5.0
741 double FGRadioStack::get_nav1_gs_needle_deflection() const {
742 if ( nav1_inrange && nav1_has_gs ) {
743 double x = nav1_gs_dist;
744 double y = (FGBFI::getAltitude() - nav1_elev) * FEET_TO_METER;
745 double angle = atan2( y, x ) * RAD_TO_DEG;
746 return (nav1_target_gs - angle) * 5.0;
753 // return the amount of glide slope needle deflection (.i.e. the
754 // number of degrees we are off the glide slope * 5.0
755 double FGRadioStack::get_nav2_gs_needle_deflection() const {
756 if ( nav2_inrange && nav2_has_gs ) {
757 double x = nav2_gs_dist;
758 double y = (FGBFI::getAltitude() - nav2_elev) * FEET_TO_METER;
759 double angle = atan2( y, x ) * RAD_TO_DEG;
760 return (nav2_target_gs - angle) * 5.0;
768 * Return true if the NAV1 TO flag should be active.
771 FGRadioStack::get_nav1_to_flag () const
774 double offset = fabs(nav1_heading - nav1_radial);
778 return (offset <= 90.0 || offset >= 270.0);
786 * Return true if the NAV1 FROM flag should be active.
789 FGRadioStack::get_nav1_from_flag () const
792 double offset = fabs(nav1_heading - nav1_radial);
796 return (offset > 90.0 && offset < 270.0);
804 * Return true if the NAV2 TO flag should be active.
807 FGRadioStack::get_nav2_to_flag () const
810 double offset = fabs(nav2_heading - nav2_radial);
814 return (offset <= 90.0 || offset >= 270.0);
822 * Return true if the NAV2 FROM flag should be active.
825 FGRadioStack::get_nav2_from_flag () const
828 double offset = fabs(nav2_heading - nav2_radial);
832 return (offset > 90.0 && offset < 270.0);