// antenna.hxx -- FGRadioAntenna: class to represent antenna properties
//
-// Written by Adrian Musceac, started December 2011.
+// Written by Adrian Musceac YO8RZZ, started December 2011.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+#ifndef __cplusplus
+# error This library requires C++
+#endif
+
+#include <simgear/compiler.h>
+#include <simgear/structure/subsystem_mgr.hxx>
+#include <Main/fg_props.hxx>
+
+#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/debug/logstream.hxx>
+
+using std::string;
+
+class FGRadioAntenna
+{
+private:
+
+/*** load external plot file generated by NEC2. needs to have a txt extension
+* when naming plots, use the following scheme: type_frequencyMHz.txt
+* eg: yagi_110.txt or LPDA_333.txt
+* @param: name of file
+* @return: none
+***/
+ void load_NEC_antenna_pattern(string type);
+
+ int _mirror_y;
+ int _mirror_z;
+ int _invert_ground;
+ double _heading_deg;
+ double _elevation_angle_deg;
+ struct AntennaGain {
+ double azimuth;
+ double elevation;
+ double gain;
+ };
+ SGPath _pattern_file;
+ typedef std::vector<AntennaGain*> AntennaPattern;
+ AntennaPattern _pattern;
+
+public:
+
+ FGRadioAntenna(string type);
+ ~FGRadioAntenna();
+
+/*** calculate far-field antenna gain on a 3D volume around it
+* @param: bearing to the other station, vertical angle (some call it theta)
+* @return: gain relative to maximum normalized gain. will be negative in all cases
+***/
+ double calculate_gain(double bearing, double angle);
+
+ /// some convenience setters and getters (unused for now)
+ inline void set_heading(double heading_deg) {_heading_deg = heading_deg ;};
+ inline void set_elevation_angle(double elevation_angle_deg) {_elevation_angle_deg = elevation_angle_deg ;};
+};