antenna.hxx

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// antenna.hxx -- FGRadioAntenna: class to represent antenna properties
//
// 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
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// 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.
 
#pragma once
 
#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>
 
 
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(std::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(std::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);
        
        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 ;};
};