80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
// dme.hxx - distance-measuring equipment.
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// Written by David Megginson, started 2003.
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//
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// This file is in the Public Domain and comes with no warranty.
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#ifndef __INSTRUMENTS_DME_HXX
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#define __INSTRUMENTS_DME_HXX 1
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/math/point3d.hxx>
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#include <simgear/props/props.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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/**
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* Model a DME radio.
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*
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* Input properties:
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*
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* /position/longitude-deg
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* /position/latitude-deg
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* /position/altitude-ft
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* /systems/electrical/outputs/dme
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* /instrumentation/dme/serviceable
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* /instrumentation/dme/frequencies/source
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* /instrumentation/dme/frequencies/selected-mhz
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*
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* Output properties:
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*
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* /instrumentation/dme/in-range
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* /instrumentation/dme/indicated-distance-nm
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* /instrumentation/dme/indicated-ground-speed-kt
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* /instrumentation/dme/indicated-time-kt
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*/
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class DME : public SGSubsystem
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{
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public:
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DME ();
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virtual ~DME ();
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virtual void init ();
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virtual void update (double delta_time_sec);
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private:
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void search (double frequency, double longitude_rad,
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double latitude_rad, double altitude_m);
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SGPropertyNode_ptr _longitude_node;
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SGPropertyNode_ptr _latitude_node;
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SGPropertyNode_ptr _altitude_node;
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SGPropertyNode_ptr _serviceable_node;
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SGPropertyNode_ptr _electrical_node;
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SGPropertyNode_ptr _source_node;
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SGPropertyNode_ptr _frequency_node;
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SGPropertyNode_ptr _in_range_node;
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SGPropertyNode_ptr _distance_node;
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SGPropertyNode_ptr _speed_node;
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SGPropertyNode_ptr _time_node;
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double _last_distance_nm;
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double _last_frequency_mhz;
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double _time_before_search_sec;
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bool _transmitter_valid;
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Point3D _transmitter;
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double _transmitter_elevation_ft;
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double _transmitter_range_nm;
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};
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#endif // __INSTRUMENTS_DME_HXX
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