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 <Aircraft/aircraft.hxx>
25 #include <Main/bfi.hxx>
26 #include <Navaids/ilslist.hxx>
27 #include <Navaids/navlist.hxx>
28 #include <Time/event.hxx>
30 #include "radiostack.hxx"
33 * Boy, this is ugly! Make the VOR range vary by altitude difference.
36 kludgeRange (double stationElev, double aircraftElev, double nominalRange)
38 // Assume that the nominal range (usually
39 // 50nm) applies at a 5,000 ft difference.
41 double factor = ((aircraftElev*METER_TO_FEET) - stationElev) / 1000.0;
42 double range = fabs(nominalRange * factor);
44 // Clamp the range to keep it sane; for
45 // now, never less than 25% or more than
46 // 500% of nominal range.
47 if (range < nominalRange/4.0) {
48 range = nominalRange/4.0;
49 } else if (range > nominalRange*5.0) {
50 range = nominalRange*5.0;
57 FGRadioStack *current_radiostack;
60 // periodic radio station search wrapper
61 static void fgRadioSearch( void ) {
62 current_radiostack->search();
66 FGRadioStack::FGRadioStack() {
72 longitudeVal = globals->get_props()->getValue("/position/longitude");
73 latitudeVal = globals->get_props()->getValue("/position/latitude");
74 altitudeVal = globals->get_props()->getValue("/position/altitude");
79 FGRadioStack::~FGRadioStack()
81 unbind(); // FIXME: should be called externally
91 // Search radio database once per second
92 global_events.Register( "fgRadioSearch()", fgRadioSearch,
93 fgEVENT::FG_EVENT_READY, 1000);
100 fgTie("/radios/nav1/frequencies/selected", this,
101 &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
102 fgTie("/radios/nav1/frequencies/standby", this,
103 &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
104 fgTie("/radios/nav1/radials/selected", this,
105 &FGRadioStack::get_nav1_sel_radial,
106 &FGRadioStack::set_nav1_sel_radial);
109 fgTie("/radios/nav1/radials/actual", this, &FGRadioStack::get_nav1_radial);
110 fgTie("/radios/nav1/to-flag", this, &FGRadioStack::get_nav1_to_flag);
111 fgTie("/radios/nav1/from-flag", this, &FGRadioStack::get_nav1_from_flag);
112 fgTie("/radios/nav1/in-range", this, &FGRadioStack::get_nav1_inrange);
113 fgTie("/radios/nav1/dme/distance", this, &FGRadioStack::get_nav1_dme_dist);
114 fgTie("/radios/nav1/dme/in-range", this,
115 &FGRadioStack::get_nav1_dme_inrange);
118 fgTie("/radios/nav2/frequencies/selected", this,
119 &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
120 fgTie("/radios/nav2/frequencies/standby", this,
121 &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
122 fgTie("/radios/nav2/radials/selected", this,
123 &FGRadioStack::get_nav2_sel_radial,
124 &FGRadioStack::set_nav2_sel_radial);
127 fgTie("/radios/nav2/radials/actual", this, &FGRadioStack::get_nav2_radial);
128 fgTie("/radios/nav2/to-flag", this, &FGRadioStack::get_nav2_to_flag);
129 fgTie("/radios/nav2/from-flag", this, &FGRadioStack::get_nav2_from_flag);
130 fgTie("/radios/nav2/in-range", this, &FGRadioStack::get_nav2_inrange);
131 fgTie("/radios/nav2/dme/distance", this, &FGRadioStack::get_nav2_dme_dist);
132 fgTie("/radios/nav2/dme/in-range", this,
133 &FGRadioStack::get_nav2_dme_inrange);
136 fgTie("/radios/adf/frequencies/selected", this,
137 &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
138 fgTie("/radios/adf/frequencies/standby", this,
139 &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
140 fgTie("/radios/adf/rotation", this,
141 &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
145 FGRadioStack::unbind ()
147 fgUntie("/radios/nav1/frequencies/selected");
148 fgUntie("/radios/nav1/frequencies/standby");
149 fgUntie("/radios/nav1/radials/actual");
150 fgUntie("/radios/nav1/radials/selected");
151 fgUntie("/radios/nav1/to-flag");
152 fgUntie("/radios/nav1/from-flag");
153 fgUntie("/radios/nav1/in-range");
154 fgUntie("/radios/nav1/dme/distance");
155 fgUntie("/radios/nav1/dme/in-range");
157 fgUntie("/radios/nav2/frequencies/selected");
158 fgUntie("/radios/nav2/frequencies/standby");
159 fgUntie("/radios/nav2/radials/actual");
160 fgUntie("/radios/nav2/radials/selected");
161 fgUntie("/radios/nav2/to-flag");
162 fgUntie("/radios/nav2/from-flag");
163 fgUntie("/radios/nav2/in-range");
164 fgUntie("/radios/nav2/dme/distance");
165 fgUntie("/radios/nav2/dme/in-range");
167 fgUntie("/radios/adf/frequencies/selected");
168 fgUntie("/radios/adf/frequencies/standby");
169 fgUntie("/radios/adf/rotation");
172 // Search the database for the current frequencies given current location
174 FGRadioStack::update()
176 double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
177 double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
178 double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
182 Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
187 station = Point3D( nav1_x, nav1_y, nav1_z );
188 nav1_loc_dist = aircraft.distance3D( station );
190 if ( nav1_has_dme ) {
191 // staightline distance
192 station = Point3D( nav1_dme_x, nav1_dme_y, nav1_dme_z );
193 nav1_dme_dist = aircraft.distance3D( station );
199 station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
200 nav1_gs_dist = aircraft.distance3D( station );
205 if ( nav1_loc_dist < nav1_effective_range * NM_TO_METER ) {
209 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
210 nav1_loclat, nav1_loclon,
212 nav1_heading = az1 - nav1_offset;
213 // Alex: nav1_heading = - (az1 - FGBFI::getMagVar() / RAD_TO_DEG);
215 // cout << " heading = " << nav1_heading
216 // << " dist = " << nav1_dist << endl;
218 nav1_inrange = false;
223 nav1_radial = nav1_sel_radial;
226 nav1_inrange = false;
228 // cout << "not picking up vor. :-(" << endl;
232 station = Point3D( nav2_x, nav2_y, nav2_z );
233 nav2_loc_dist = aircraft.distance3D( station );
235 if ( nav2_has_dme ) {
236 // staightline distance
237 station = Point3D( nav2_dme_x, nav2_dme_y, nav2_dme_z );
238 nav2_dme_dist = aircraft.distance3D( station );
244 station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
245 nav2_gs_dist = aircraft.distance3D( station );
250 if ( nav2_loc_dist < nav2_effective_range * NM_TO_METER ) {
254 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
255 nav2_loclat, nav2_loclon,
257 nav2_heading = az1 - nav2_offset;
258 // Alex: nav2_heading = - (az1 - FGBFI::getMagVar() / RAD_TO_DEG);
260 // cout << " heading = " << nav2_heading
261 // << " dist = " << nav2_dist << endl;
263 nav2_inrange = false;
267 nav2_radial = nav2_sel_radial;
270 nav2_inrange = false;
271 // cout << "not picking up vor. :-(" << endl;
276 // staightline distance
277 station = Point3D( adf_x, adf_y, adf_z );
278 adf_dist = aircraft.distance3D( station );
280 if ( adf_dist < adf_effective_range * NM_TO_METER ) {
284 geo_inverse_wgs_84( elev, lat * RAD_TO_DEG, lon * RAD_TO_DEG,
289 // cout << " heading = " << nav2_heading
290 // << " dist = " << nav2_dist << endl;
300 // Update current nav/adf radio stations based on current postition
301 void FGRadioStack::search ()
303 double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
304 double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
305 double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
311 if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
314 nav1_has_dme = ils.get_has_dme();
315 nav1_has_gs = ils.get_has_gs();
317 nav1_loclon = ils.get_loclon();
318 nav1_loclat = ils.get_loclat();
319 nav1_gslon = ils.get_gslon();
320 nav1_gslat = ils.get_gslat();
321 nav1_dmelon = ils.get_dmelon();
322 nav1_dmelat = ils.get_dmelat();
323 nav1_elev = ils.get_gselev();
325 nav1_effective_range = FG_ILS_DEFAULT_RANGE;
326 nav1_target_gs = ils.get_gsangle();
327 nav1_radial = ils.get_locheading();
328 while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
329 while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
330 nav1_x = ils.get_x();
331 nav1_y = ils.get_y();
332 nav1_z = ils.get_z();
333 nav1_gs_x = ils.get_gs_x();
334 nav1_gs_y = ils.get_gs_y();
335 nav1_gs_z = ils.get_gs_z();
336 nav1_dme_x = ils.get_dme_x();
337 nav1_dme_y = ils.get_dme_y();
338 nav1_dme_z = ils.get_dme_z();
339 // cout << "Found an ils station in range" << endl;
340 // cout << " id = " << ils.get_locident() << endl;
341 } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
344 nav1_has_dme = nav.get_has_dme();
346 nav1_loclon = nav.get_lon();
347 nav1_loclat = nav.get_lat();
348 nav1_elev = nav.get_elev();
349 nav1_offset = nav.get_offset();
350 nav1_effective_range = kludgeRange(nav1_elev, elev, nav.get_range());
351 nav1_target_gs = 0.0;
352 nav1_radial = nav1_sel_radial;
353 nav1_x = nav1_dme_x = nav.get_x();
354 nav1_y = nav1_dme_y = nav.get_y();
355 nav1_z = nav1_dme_z = nav.get_z();
356 // cout << "Found a vor station in range" << endl;
357 // cout << " id = " << nav.get_ident() << endl;
362 // cout << "not picking up vor1. :-(" << endl;
365 if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
368 nav2_has_dme = ils.get_has_dme();
369 nav2_has_gs = ils.get_has_gs();
371 nav2_loclon = ils.get_loclon();
372 nav2_loclat = ils.get_loclat();
373 nav2_elev = ils.get_gselev();
375 nav2_effective_range = FG_ILS_DEFAULT_RANGE;
376 nav2_target_gs = ils.get_gsangle();
377 nav2_radial = ils.get_locheading();
378 while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
379 while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
380 nav2_x = ils.get_x();
381 nav2_y = ils.get_y();
382 nav2_z = ils.get_z();
383 nav2_gs_x = ils.get_gs_x();
384 nav2_gs_y = ils.get_gs_y();
385 nav2_gs_z = ils.get_gs_z();
386 nav2_dme_x = ils.get_dme_x();
387 nav2_dme_y = ils.get_dme_y();
388 nav2_dme_z = ils.get_dme_z();
389 // cout << "Found an ils station in range" << endl;
390 // cout << " id = " << ils.get_locident() << endl;
391 } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
394 nav2_has_dme = nav.get_has_dme();
395 nav2_has_dme = false;
396 nav2_loclon = nav.get_lon();
397 nav2_loclat = nav.get_lat();
398 nav2_elev = nav.get_elev();
399 nav2_offset = nav.get_offset();
400 nav2_effective_range = kludgeRange(nav2_elev, elev, nav.get_range());
401 nav2_target_gs = 0.0;
402 nav2_radial = nav2_sel_radial;
403 nav2_x = nav2_dme_x = nav.get_x();
404 nav2_y = nav2_dme_y = nav.get_y();
405 nav2_z = nav2_dme_z = nav.get_z();
406 // cout << "Found a vor station in range" << endl;
407 // cout << " id = " << nav.get_ident() << endl;
412 // cout << "not picking up vor2. :-(" << endl;
416 if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
419 adf_lon = nav.get_lon();
420 adf_lat = nav.get_lat();
421 adf_elev = nav.get_elev();
422 adf_effective_range = kludgeRange(adf_elev, elev, nav.get_range());
426 // cout << "Found an adf station in range" << endl;
427 // cout << " id = " << nav.get_ident() << endl;
430 // cout << "not picking up adf. :-(" << endl;
436 * Return true if the NAV1 TO flag should be active.
439 FGRadioStack::get_nav1_to_flag () const
442 double offset = fabs(nav1_heading - nav1_radial);
444 return (offset <= 8.0 || offset >= 352.0);
446 return (offset <= 20.0 || offset >= 340.0);
454 * Return true if the NAV1 FROM flag should be active.
457 FGRadioStack::get_nav1_from_flag () const
460 double offset = fabs(nav1_heading - nav1_radial);
462 return (offset >= 172.0 && offset <= 188.0);
464 return (offset >= 160.0 && offset <= 200.0);
472 * Return true if the NAV2 TO flag should be active.
475 FGRadioStack::get_nav2_to_flag () const
478 double offset = fabs(nav2_heading - nav2_radial);
480 return (offset <= 8.0 || offset >= 352.0);
482 return (offset <= 20.0 || offset >= 340.0);
490 * Return true if the NAV2 FROM flag should be active.
493 FGRadioStack::get_nav2_from_flag () const
496 double offset = fabs(nav2_heading - nav2_radial);
498 return (offset >= 172.0 && offset <= 188.0);
500 return (offset >= 160.0 && offset <= 200.0);