1 // navdb.cxx -- top level navaids management routines
3 // Written by Curtis Olson, started May 2004.
5 // Copyright (C) 2004 Curtis L. Olson - http://www.flightgear.org/~curt
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 #include <simgear/compiler.h>
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/math/sg_geodesy.hxx>
34 #include <Airports/runways.hxx>
35 #include <Airports/simple.hxx>
36 #include <Main/globals.hxx>
38 #include "navrecord.hxx"
44 // load and initialize the navigational databases
45 bool fgNavDBInit( FGAirportList *airports,
46 FGNavList *navlist, FGNavList *loclist, FGNavList *gslist,
47 FGNavList *dmelist, FGNavList *mkrlist,
48 FGNavList *tacanlist, FGNavList *carrierlist,
49 FGTACANList *channellist)
51 SG_LOG(SG_GENERAL, SG_INFO, "Loading Navaid Databases");
52 // SG_LOG(SG_GENERAL, SG_INFO, " VOR/NDB");
53 // SGPath p_nav( globals->get_fg_root() );
54 // p_nav.append( "Navaids/default.nav" );
55 // navlist->init( p_nav );
57 // SG_LOG(SG_GENERAL, SG_INFO, " ILS and Marker Beacons");
59 // SGPath p_ils( globals->get_fg_root() );
60 // p_ils.append( "Navaids/default.ils" );
61 // ilslist->init( p_ils );
64 SGPath path( globals->get_fg_root() );
65 path.append( "Navaids/nav.dat" );
67 sg_gzifstream in( path.str() );
68 if ( !in.is_open() ) {
69 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
73 // skip first two lines
77 while ( ! in.eof() ) {
78 FGNavRecord *r = new FGNavRecord;
80 if ( r->get_type() > 95 ) {
85 /*cout << "id = " << r->get_ident() << endl;
86 cout << " type = " << r->get_type() << endl;
87 cout << " lon = " << r->get_lon() << endl;
88 cout << " lat = " << r->get_lat() << endl;
89 cout << " elev = " <<r->get_elev_ft() << endl;
90 cout << " freq = " << r->get_freq() << endl;
91 cout << " range = " << r->get_range() << endl;
92 cout << " name = " << r->get_name() << endl << endl; */
94 // fudge elevation to the field elevation if it's not specified
95 if ( fabs(r->get_elev_ft()) < 0.01 && r->get_apt_id().length() ) {
96 // cout << r->get_type() << " " << r->get_apt_id() << " zero elev"
98 const FGAirport* a = airports->search( r->get_apt_id() );
100 r->set_elev_ft( a->getElevation() );
101 // cout << " setting to " << a.elevation << endl;
105 if ( r->get_type() == 2 || r->get_type() == 3 ) {
108 } else if ( r->get_type() == 4 || r->get_type() == 5 ) {
109 // ILS=4, LOC(only)=5
111 } else if ( r->get_type() == 6 ) {
114 } else if ( r->get_type() == 7 || r->get_type() == 8
115 || r->get_type() == 9 )
117 // Marker Beacon = 7,8,9
119 } else if ( r->get_type() == 12 || r->get_type() == 13) {
120 // DME with ILS=12; standalone DME=13
121 string str1( r->get_name() );
122 string::size_type loc1= str1.find( "TACAN", 0 );
123 string::size_type loc2 = str1.find( "VORTAC", 0 );
125 if( loc1 != string::npos || loc2 != string::npos ){
126 //cout << " name = " << r->get_name() ;
127 //cout << " freq = " << r->get_freq() ;
138 // load the carrier navaids file
142 path = globals->get_fg_root() ;
143 path.append( "Navaids/carrier_nav.dat" );
146 SG_LOG( SG_GENERAL, SG_INFO, "opening file: " << path.str() );
148 sg_gzifstream incarrier( path.str() );
150 if ( !incarrier.is_open() ) {
151 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
155 // skip first two lines
156 //incarrier >> skipeol;
157 //incarrier >> skipeol;
159 while ( ! incarrier.eof() ) {
160 FGNavRecord *r = new FGNavRecord;
162 carrierlist->add ( r );
163 /*cout << " carrier lon: "<< r->get_lon() ;
164 cout << " carrier lat: "<< r->get_lat() ;
165 cout << " freq: " << r->get_freq() ;
166 cout << " carrier name: "<< r->get_name() << endl;*/
168 //if ( r->get_type() > 95 ) {
172 // end loading the carrier navaids file
174 // load the channel/freqency file
175 string channel, freq;
177 path = globals->get_fg_root();
178 path.append( "Navaids/TACAN_freq.dat" );
180 SG_LOG( SG_GENERAL, SG_INFO, "opening file: " << path.str() );
182 sg_gzifstream inchannel( path.str() );
184 if ( !inchannel.is_open() ) {
185 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
190 inchannel >> skipeol;
191 while ( ! inchannel.eof() ) {
192 FGTACANRecord *r = new FGTACANRecord;
194 channellist->add ( r );
195 //cout << "channel = " << r->get_channel() ;
196 //cout << " freq = " << r->get_freq() << endl;
208 // Given a localizer record and it's corresponding runway record,
209 // adjust the localizer position so it is in perfect alignment with
211 static void update_loc_position( FGNavRecord *loc, FGRunway *rwy,
214 double hdg = rwy->_heading;
220 // calculate runway threshold point
221 double thresh_lat, thresh_lon, return_az;
222 geo_direct_wgs_84 ( 0.0, rwy->_lat, rwy->_lon, hdg,
223 rwy->_length/2.0 * SG_FEET_TO_METER,
224 &thresh_lat, &thresh_lon, &return_az );
225 // cout << "Threshold = " << thresh_lat << "," << thresh_lon << endl;
227 // calculate distance from threshold to localizer
228 double az1, az2, dist_m;
229 geo_inverse_wgs_84( 0.0, loc->get_lat(), loc->get_lon(),
230 thresh_lat, thresh_lon,
231 &az1, &az2, &dist_m );
232 // cout << "Distance = " << dist_m << endl;
234 // back project that distance along the runway center line
235 double nloc_lat, nloc_lon;
236 geo_direct_wgs_84 ( 0.0, thresh_lat, thresh_lon, hdg + 180.0,
237 dist_m, &nloc_lat, &nloc_lon, &return_az );
238 // printf("New localizer = %.6f %.6f\n", nloc_lat, nloc_lon );
240 // sanity check, how far have we moved the localizer?
241 geo_inverse_wgs_84( 0.0, loc->get_lat(), loc->get_lon(),
243 &az1, &az2, &dist_m );
244 // cout << "Distance moved = " << dist_m << endl;
246 // cout << "orig heading = " << loc->get_multiuse() << endl;
247 // cout << "new heading = " << rwy->_heading << endl;
249 double hdg_diff = loc->get_multiuse() - rwy->_heading;
251 // clamp to [-180.0 ... 180.0]
252 if ( hdg_diff < -180.0 ) {
254 } else if ( hdg_diff > 180.0 ) {
258 if ( fabs(hdg_diff) <= threshold ) {
259 loc->set_lat( nloc_lat );
260 loc->set_lon( nloc_lon );
261 loc->set_multiuse( rwy->_heading );
266 // This routines traverses the localizer list and attempts to match
267 // each entry with it's corresponding runway. When it is successful,
268 // it then "moves" the localizer and updates it's heading so it
269 // *perfectly* aligns with the runway, but is still the same distance
270 // from the runway threshold.
271 void fgNavDBAlignLOCwithRunway( FGRunwayList *runways, FGNavList *loclist,
273 nav_map_type navmap = loclist->get_navaids();
275 nav_map_const_iterator freq = navmap.begin();
276 while ( freq != navmap.end() ) {
277 nav_list_type locs = freq->second;
278 nav_list_const_iterator loc = locs.begin();
279 while ( loc != locs.end() ) {
280 string name = (*loc)->get_name();
281 string::size_type pos1 = name.find(" ");
282 string id = name.substr(0, pos1);
283 name = name.substr(pos1+1);
284 string::size_type pos2 = name.find(" ");
285 string rwy = name.substr(0, pos2);
288 if ( runways->search(id, rwy, &r) ) {
289 update_loc_position( (*loc), &r, threshold );