1 // dme.hxx - distance-measuring equipment.
2 // Written by David Megginson, started 2003.
4 // This file is in the Public Domain and comes with no warranty.
7 #ifndef __INSTRUMENTS_DME_HXX
8 #define __INSTRUMENTS_DME_HXX 1
10 #include <simgear/props/props.hxx>
11 #include <simgear/structure/subsystem_mgr.hxx>
19 * /position/longitude-deg
20 * /position/latitude-deg
21 * /position/altitude-ft
22 * /systems/electrical/outputs/dme
23 * /instrumentation/"name"/serviceable
24 * /instrumentation/"name"/frequencies/source
25 * /instrumentation/"name"/frequencies/selected-mhz
29 * /instrumentation/"name"/in-range
30 * /instrumentation/"name"/indicated-distance-nm
31 * /instrumentation/"name"/indicated-ground-speed-kt
32 * /instrumentation/"name"/indicated-time-kt
34 class DME : public SGSubsystem
39 DME ( SGPropertyNode *node );
43 virtual void update (double delta_time_sec);
47 void search (double frequency, double longitude_rad,
48 double latitude_rad, double altitude_m);
50 SGPropertyNode_ptr _longitude_node;
51 SGPropertyNode_ptr _latitude_node;
52 SGPropertyNode_ptr _altitude_node;
53 SGPropertyNode_ptr _serviceable_node;
54 SGPropertyNode_ptr _electrical_node;
55 SGPropertyNode_ptr _source_node;
56 SGPropertyNode_ptr _frequency_node;
58 SGPropertyNode_ptr _in_range_node;
59 SGPropertyNode_ptr _distance_node;
60 SGPropertyNode_ptr _speed_node;
61 SGPropertyNode_ptr _time_node;
63 double _last_distance_nm;
64 double _last_frequency_mhz;
65 double _time_before_search_sec;
67 bool _transmitter_valid;
69 double _transmitter_elevation_ft;
70 double _transmitter_range_nm;
71 double _transmitter_bias;
79 #endif // __INSTRUMENTS_DME_HXX