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1 // adf.hxx - automatic direction finder.
2 // Written by David Megginson, started 2003.
3 //
4 // This file is in the Public Domain and comes with no warranty.
5
6
7 #ifndef __INSTRUMENTS_ADF_HXX
8 #define __INSTRUMENTS_ADF_HXX 1
9
10 #ifndef __cplusplus
11 # error This library requires C++
12 #endif
13
14 #include <string>
15
16 #include <simgear/props/props.hxx>
17
18 #include <simgear/structure/subsystem_mgr.hxx>
19 #include <Sound/morse.hxx>
20
21 using std::string;
22
23
24 class SGSampleGroup;
25
26 /**
27  * Model an ADF radio.
28  *
29  * Input properties:
30  *
31  * /position/longitude-deg
32  * /position/latitude-deg
33  * /position/altitude-ft
34  * /orientation/heading-deg
35  * /systems/electrical/outputs/adf
36  * /instrumentation/adf/serviceable
37  * /instrumentation/adf/error-deg
38  * /instrumentation/adf/frequencies/selected-khz
39  * /instrumentation/adf/mode
40  * /instrumentation/adf/ident-audible
41  * /instrumentation/adf/volume-norm
42  *
43  * Output properties:
44  *
45  * /instrumentation/adf/in-range
46  * /instrumentation/adf/indicated-bearing-deg
47  * /instrumentation/adf/ident
48  */
49 class ADF : public SGSubsystem
50 {
51
52 public:
53
54     ADF ( SGPropertyNode *node );
55     virtual ~ADF ();
56
57     virtual void init ();
58     virtual void update (double delta_time_sec);
59
60 private:
61
62     void set_bearing (double delta_time_sec, double bearing);
63
64     void search (double frequency, double longitude_rad,
65                  double latitude_rad, double altitude_m);
66
67     string _name;
68     unsigned int _num;
69
70     SGPropertyNode_ptr _longitude_node;
71     SGPropertyNode_ptr _latitude_node;
72     SGPropertyNode_ptr _altitude_node;
73     SGPropertyNode_ptr _heading_node;
74     SGPropertyNode_ptr _serviceable_node;
75     SGPropertyNode_ptr _error_node;
76     SGPropertyNode_ptr _electrical_node;
77     SGPropertyNode_ptr _frequency_node;
78     SGPropertyNode_ptr _mode_node;
79
80     SGPropertyNode_ptr _in_range_node;
81     SGPropertyNode_ptr _bearing_node;
82     SGPropertyNode_ptr _ident_node;
83     SGPropertyNode_ptr _ident_audible_node;
84     SGPropertyNode_ptr _volume_node;
85
86     double _time_before_search_sec;
87
88     int _last_frequency_khz;
89     bool _transmitter_valid;
90     string _last_ident;
91     SGGeod _transmitter_pos;
92     SGVec3d _transmitter_cart;
93     double _transmitter_range_nm;
94
95     FGMorse morse;
96     int _ident_count;
97     time_t _last_ident_time;
98     float _last_volume;
99     string _adf_ident;
100
101     SGSharedPtr<SGSampleGroup> _sgr;
102 };
103
104
105 #endif // __INSTRUMENTS_ADF_HXX