// $Id$
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
#include <simgear/debug/logstream.hxx>
-#include <simgear/misc/fgstream.hxx>
-#include <simgear/math/fg_geodesy.hxx>
+#include <simgear/misc/sgstream.hxx>
+#include <simgear/math/sg_geodesy.hxx>
#include "navlist.hxx"
// load the navaids and build the map
-bool FGNavList::init( FGPath path ) {
+bool FGNavList::init( SGPath path ) {
FGNav n;
navaids.erase( navaids.begin(), navaids.end() );
- fg_gzifstream in( path.str() );
+ sg_gzifstream in( path.str() );
if ( !in.is_open() ) {
- FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << path.str() );
+ SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
exit(-1);
}
}
}
- cout << "min freq = " << min << endl;
- cout << "max freq = " << max << endl;
+ // cout << "min freq = " << min << endl;
+ // cout << "max freq = " << max << endl;
#endif
// query the database for the specified frequency, lon and lat are in
// degrees, elev is in meters
bool FGNavList::query( double lon, double lat, double elev, double freq,
- FGNav *n, double *heading, double *dist )
+ FGNav *n )
{
nav_list_type stations = navaids[(int)(freq*100.0 + 0.5)];
nav_list_iterator current = stations.begin();
nav_list_iterator last = stations.end();
- double az1, az2, s;
+ // double az1, az2, s;
+ Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
+ Point3D station;
+ double d;
for ( ; current != last ; ++current ) {
// cout << "testing " << current->get_ident() << endl;
- geo_inverse_wgs_84( elev, lat, lon,
- current->get_lat(), current->get_lon(),
- &az1, &az2, &s );
- // cout << " dist = " << s << endl;
- if ( s < ( current->get_range() * NM_TO_METER ) ) {
+ station = Point3D(current->get_x(), current->get_y(), current->get_z());
+
+ d = aircraft.distance3Dsquared( station );
+
+ // cout << " dist = " << sqrt(d)
+ // << " range = " << current->get_range() * SG_NM_TO_METER << endl;
+
+ // match up to twice the published range so we can model
+ // reduced signal strength
+ if ( d < (2 * current->get_range() * SG_NM_TO_METER
+ * 2 * current->get_range() * SG_NM_TO_METER ) ) {
+ // cout << "matched = " << current->get_ident() << endl;
*n = *current;
- *heading = az2;
- *dist = s;
return true;
}
}