src/Instrumentation/gps.hxx

   1 // gps.hxx - distance-measuring equipment.
   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_GPS_HXX
   8 #define __INSTRUMENTS_GPS_HXX 1
   9
  10 #ifndef __cplusplus
  11 # error This library requires C++
  12 #endif
  13
  14 #include <simgear/props/props.hxx>
  15 #include <simgear/structure/subsystem_mgr.hxx>
  16
  17
  18 /**
  19  * Model a GPS radio.
  20  *
  21  * Input properties:
  22  *
  23  * /position/longitude-deg
  24  * /position/latitude-deg
  25  * /position/altitude-ft
  26  * /environment/magnetic-variation-deg
  27  * /systems/electrical/outputs/gps
  28  * /instrumentation/gps/serviceable
  29  *
  30  * Output properties:
  31  *
  32  * /instrumentation/gps/indicated-longitude-deg
  33  * /instrumentation/gps/indicated-latitude-deg
  34  * /instrumentation/gps/indicated-altitude-ft
  35  * /instrumentation/gps/indicated-track-true-deg
  36  * /instrumentation/gps/indicated-track-magnetic-deg
  37  * /instrumentation/gps/indicated-ground-speed-kt
  38  */
  39 class GPS : public SGSubsystem
  40 {
  41
  42 public:
  43
  44     GPS ();
  45     virtual ~GPS ();
  46
  47     virtual void init ();
  48     virtual void update (double delta_time_sec);
  49
  50 private:
  51
  52     void search (double frequency, double longitude_rad,
  53                  double latitude_rad, double altitude_m);
  54
  55     SGPropertyNode_ptr _longitude_node;
  56     SGPropertyNode_ptr _latitude_node;
  57     SGPropertyNode_ptr _altitude_node;
  58     SGPropertyNode_ptr _magvar_node;
  59     SGPropertyNode_ptr _serviceable_node;
  60     SGPropertyNode_ptr _electrical_node;
  61
  62     SGPropertyNode_ptr _raim_node;
  63     SGPropertyNode_ptr _indicated_longitude_node;
  64     SGPropertyNode_ptr _indicated_latitude_node;
  65     SGPropertyNode_ptr _indicated_altitude_node;
  66     SGPropertyNode_ptr _true_track_node;
  67     SGPropertyNode_ptr _magnetic_track_node;
  68     SGPropertyNode_ptr _speed_node;
  69
  70     bool _last_valid;
  71     double _last_longitude_deg;
  72     double _last_latitude_deg;
  73     double _last_altitude_m;
  74
  75 };
  76
  77
  78 #endif // __INSTRUMENTS_GPS_HXX