1 // radio.hxx -- FGRadio: class to manage radio propagation
3 // Written by Adrian Musceac, started August 2011.
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License as
7 // published by the Free Software Foundation; either version 2 of the
8 // License, or (at your option) any later version.
10 // This program is distributed in the hope that it will be useful, but
11 // WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 # error This library requires C++
24 #include <simgear/compiler.h>
25 #include <simgear/structure/subsystem_mgr.hxx>
27 #include <Main/fg_props.hxx>
29 #include <simgear/math/sg_geodesy.hxx>
30 #include <simgear/debug/logstream.hxx>
36 class FGRadioTransmission
39 bool isOperable() const
41 bool _operable; ///< is the unit serviceable, on, powered, etc
43 double _receiver_sensitivity;
44 double _transmitter_power;
45 double _tx_antenna_height;
46 double _rx_antenna_height;
47 double _rx_antenna_gain;
48 double _tx_antenna_gain;
49 double _rx_line_losses;
50 double _tx_line_losses;
51 double _terrain_sampling_distance;
53 std::map<string, double[2]> _mat_database;
54 SGPropertyNode *_root_node;
55 int _propagation_model; /// 0 none, 1 round Earth, 2 ITM
56 double polarization_loss();
57 double ITM_calculate_attenuation(SGGeod tx_pos, double freq, int ground_to_air);
58 double LOS_calculate_attenuation(SGGeod tx_pos, double freq, int ground_to_air);
59 void clutterLoss(double freq, double itm_elev[], std::deque<string> materials,
60 double transmitter_height, double receiver_height, int p_mode,
61 double horizons[], double &clutter_loss);
62 void get_material_properties(string mat_name, double &height, double &density);
66 FGRadioTransmission();
67 ~FGRadioTransmission();
69 // a couple of setters and getters for convenience
70 void setFrequency(double freq, int radio);
71 double getFrequency(int radio);
72 void setTxPower(double txpower) { _transmitter_power = txpower; };
73 void setRxSensitivity(double sensitivity) { _receiver_sensitivity = sensitivity; };
74 void setTxAntennaHeight(double tx_antenna_height) { _tx_antenna_height = tx_antenna_height; };
75 void setRxAntennaHeight(double rx_antenna_height) { _rx_antenna_height = rx_antenna_height; };
76 void setTxAntennaGain(double tx_antenna_gain) { _tx_antenna_gain = tx_antenna_gain; };
77 void setRxAntennaGain(double rx_antenna_gain) { _rx_antenna_gain = rx_antenna_gain; };
78 void setTxLineLosses(double tx_line_losses) { _tx_line_losses = tx_line_losses; };
79 void setRxLineLosses(double rx_line_losses) { _rx_line_losses = rx_line_losses; };
80 void setPropagationModel(int model) { _propagation_model = model; };
81 void setPolarization(int polarization) { _polarization = polarization; };
82 // accessory functions for unit conversions
83 double watt_to_dbm(double power_watt);
84 double dbm_to_watt(double dbm);
85 double dbm_to_microvolt(double dbm);
88 // transmission_type: 0 for air to ground 1 for ground to air, 2 for air to air, 3 for pilot to ground, 4 for pilot to air
89 void receiveATC(SGGeod tx_pos, double freq, string text, int transmission_type);
90 void receiveChat(SGGeod tx_pos, double freq, string text, int transmission_type);
91 // returns signal quality
92 // transmission_type: 0 for VOR, 1 for ILS
93 double receiveNav(SGGeod tx_pos, double freq, int transmission_type);