//
// This file is in the Public Domain and comes with no warranty.
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
#include <simgear/compiler.h>
#include <simgear/math/sg_geodesy.hxx>
#include <simgear/math/sg_random.h>
#include <Main/fg_props.hxx>
-#include <Navaids/ilslist.hxx>
#include <Navaids/navlist.hxx>
#include "dme.hxx"
double range_nm = 1.23 * sqrt(delta_elevation_ft);
if (range_nm > max_range_nm)
range_nm = max_range_nm;
+ else if (range_nm < 20.0)
+ range_nm = 20.0;
double rand = sg_random();
return range_nm + (range_nm * rand * rand);
}
-DME::DME ()
+DME::DME ( SGPropertyNode *node )
: _last_distance_nm(0),
_last_frequency_mhz(-1),
_time_before_search_sec(0),
_transmitter_valid(false),
_transmitter_elevation_ft(0),
- _transmitter_range_nm(0)
+ _transmitter_range_nm(0),
+ _transmitter_bias(0.0),
+ _name(node->getStringValue("name", "dme")),
+ _num(node->getIntValue("number", 0))
{
}
void
DME::init ()
{
+ string branch;
+ branch = "/instrumentation/" + _name;
+
+ SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
+
_longitude_node = fgGetNode("/position/longitude-deg", true);
_latitude_node = fgGetNode("/position/latitude-deg", true);
- _altitude_node = fgGetNode("/position/altitude-deg", true);
- _serviceable_node = fgGetNode("/instrumentation/dme/serviceable", true);
+ _altitude_node = fgGetNode("/position/altitude-ft", true);
+ _serviceable_node = node->getChild("serviceable", 0, true);
_electrical_node = fgGetNode("/systems/electrical/outputs/dme", true);
- _source_node = fgGetNode("/instrumentation/dme/frequencies/source", true);
- _frequency_node =
- fgGetNode("/instrumentation/dme/frequencies/selected-mhz", true);
-
- _in_range_node = fgGetNode("/instrumentation/dme/in-range", true);
- _distance_node =
- fgGetNode("/instrumentation/dme/indicated-distance-nm", true);
- _speed_node =
- fgGetNode("/instrumentation/dme/indicated-ground-speed-kt", true);
- _time_node =
- fgGetNode("/instrumentation/dme/indicated-time-min", true);
+ SGPropertyNode *fnode = node->getChild("frequencies", 0, true);
+ _source_node = fnode->getChild("source", 0, true);
+ _frequency_node = fnode->getChild("selected-mhz", 0, true);
+ _in_range_node = node->getChild("in-range", 0, true);
+ _distance_node = node->getChild("indicated-distance-nm", 0, true);
+ _speed_node = node->getChild("indicated-ground-speed-kt", 0, true);
+ _time_node = node->getChild("indicated-time-min", 0, true);
}
void
// Figure out the source
const char * source = _source_node->getStringValue();
if (source[0] == '\0') {
- source = "/instrumentation/dme/frequencies/selected-mhz";
- _source_node->setStringValue(source);
+ string branch;
+ branch = "/instrumentation/" + _name + "/frequencies/selected-mhz";
+ _source_node->setStringValue(branch.c_str());
+ source = _source_node->getStringValue();
}
-
// Get the frequency
+
double frequency_mhz = fgGetDouble(source, 108.0);
if (frequency_mhz != _last_frequency_mhz) {
_time_before_search_sec = 0;
double latitude_rad =
_latitude_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
double altitude_m =
- _altitude_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
+ _altitude_node->getDoubleValue() * SG_FEET_TO_METER;
// On timeout, scan again
_time_before_search_sec -= delta_time_sec;
}
// Calculate the distance to the transmitter
- Point3D location =
- sgGeodToCart(Point3D(longitude_rad, latitude_rad, altitude_m));
- double distance_nm = _transmitter.distance3D(location) * SG_METER_TO_NM;
+ SGGeod geod = SGGeod::fromRadM(longitude_rad, latitude_rad, altitude_m);
+ SGVec3d location = SGVec3d::fromGeod(geod);
+
+ double distance_nm = dist(_transmitter, location) * SG_METER_TO_NM;
+
double range_nm = adjust_range(_transmitter_elevation_ft,
altitude_m * SG_METER_TO_FEET,
_transmitter_range_nm);
+
if (distance_nm <= range_nm) {
double speed_kt = (fabs(distance_nm - _last_distance_nm) *
((1 / delta_time_sec) * 3600.0));
_last_distance_nm = distance_nm;
_in_range_node->setBoolValue(true);
- _distance_node->setDoubleValue(distance_nm);
+ double tmp_dist = distance_nm - _transmitter_bias;
+ if ( tmp_dist < 0.0 ) {
+ tmp_dist = 0.0;
+ }
+ _distance_node->setDoubleValue( tmp_dist );
_speed_node->setDoubleValue(speed_kt);
_time_node->setDoubleValue(distance_nm/speed_kt*60.0);
DME::search (double frequency_mhz, double longitude_rad,
double latitude_rad, double altitude_m)
{
- // reset search time
+ // reset search time
_time_before_search_sec = 1.0;
- // try the ILS list first
- FGILS * ils = current_ilslist->findByFreq(frequency_mhz,
- longitude_rad,
- latitude_rad,
- altitude_m);
- if (ils != 0 && ils->get_has_dme()) {
- _transmitter_valid = true;
- _transmitter = Point3D(ils->get_dme_x(),
- ils->get_dme_y(),
- ils->get_dme_z());
- _transmitter_elevation_ft = ils->get_gselev() * SG_METER_TO_FEET;
- _transmitter_range_nm = 50; // arbitrary
- return;
- }
+ // try the ILS list first
+
+ FGNavRecord *dme = globals->get_dmelist()->findByFreq( frequency_mhz,
+ SGGeod::fromRadM(longitude_rad, latitude_rad, altitude_m));
- // try the VORs next
- FGNav * nav = current_navlist->findByFreq(frequency_mhz,
- longitude_rad,
- latitude_rad,
- altitude_m);
- if (nav != 0)
- if (nav != 0 && nav->get_has_dme()) {
- _transmitter_valid = true;
- _transmitter = Point3D(nav->get_x(),
- nav->get_y(),
- nav->get_z());
- _transmitter_elevation_ft = nav->get_elev() * SG_METER_TO_FEET;
- _transmitter_range_nm = nav->get_range(); // fixme
- return;
- }
+ _transmitter_valid = (dme != NULL);
- _transmitter_valid = false;
+ if ( _transmitter_valid ) {
+ _transmitter = dme->cart();
+ _transmitter_elevation_ft = dme->get_elev_ft();
+ _transmitter_range_nm = dme->get_range();
+ _transmitter_bias = dme->get_multiuse();
+ }
}
// end of dme.cxx
projects / flightgear.git / blobdiff