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flightgear/src/Instrumentation/navradio.hxx

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C++

// navradio.hxx -- class to manage a nav radio instance
//
// Written by Curtis Olson, started April 2000.
//
// Copyright (C) 2000 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef _FG_NAVRADIO_HXX
#define _FG_NAVRADIO_HXX
#include <Main/fg_props.hxx>
#include "Sound/morse.hxx"
#include <simgear/compiler.h>
#include <simgear/structure/subsystem_mgr.hxx>
#include <simgear/timing/timestamp.hxx>
// forward decls
class SGInterpTable;
class FGNavRecord;
typedef SGSharedPtr<FGNavRecord> FGNavRecordPtr;
class FGNavRadio : public SGSubsystem
{
FGMorse morse;
SGInterpTable *term_tbl;
SGInterpTable *low_tbl;
SGInterpTable *high_tbl;
SGPropertyNode_ptr lon_node;
SGPropertyNode_ptr lat_node;
SGPropertyNode_ptr alt_node;
SGPropertyNode_ptr bus_power_node;
// property inputs
SGPropertyNode_ptr is_valid_node; // is station data valid (may be way out
// of range.)
SGPropertyNode_ptr power_btn_node;
SGPropertyNode_ptr freq_node; // primary freq
SGPropertyNode_ptr alt_freq_node; // standby freq
SGPropertyNode_ptr sel_radial_node; // selected radial
SGPropertyNode_ptr vol_btn_node;
SGPropertyNode_ptr ident_btn_node;
SGPropertyNode_ptr audio_btn_node;
SGPropertyNode_ptr backcourse_node;
SGPropertyNode_ptr nav_serviceable_node;
SGPropertyNode_ptr cdi_serviceable_node;
SGPropertyNode_ptr gs_serviceable_node;
SGPropertyNode_ptr tofrom_serviceable_node;
// property outputs
SGPropertyNode_ptr fmt_freq_node; // formated frequency
SGPropertyNode_ptr fmt_alt_freq_node; // formated alternate frequency
SGPropertyNode_ptr heading_node; // true heading to nav station
SGPropertyNode_ptr radial_node; // current radial we are on (taking
// into consideration the vor station
// alignment which likely doesn't
// match the magnetic alignment
// exactly.)
SGPropertyNode_ptr recip_radial_node; // radial_node(val) + 180 (for
// convenience)
SGPropertyNode_ptr target_radial_true_node;
// true heading of selected radial
SGPropertyNode_ptr target_auto_hdg_node;
// suggested autopilot heading
// to intercept selected radial
SGPropertyNode_ptr time_to_intercept; // estimated time to intecept selected
// radial at current speed and heading
SGPropertyNode_ptr to_flag_node;
SGPropertyNode_ptr from_flag_node;
SGPropertyNode_ptr inrange_node;
SGPropertyNode_ptr signal_quality_norm_node;
SGPropertyNode_ptr cdi_deflection_node;
SGPropertyNode_ptr cdi_deflection_norm_node;
SGPropertyNode_ptr cdi_xtrack_error_node;
SGPropertyNode_ptr cdi_xtrack_hdg_err_node;
SGPropertyNode_ptr has_gs_node;
SGPropertyNode_ptr loc_node;
SGPropertyNode_ptr loc_dist_node;
SGPropertyNode_ptr gs_deflection_node;
SGPropertyNode_ptr gs_deflection_deg_node;
SGPropertyNode_ptr gs_deflection_norm_node;
SGPropertyNode_ptr gs_rate_of_climb_node;
SGPropertyNode_ptr gs_dist_node;
SGPropertyNode_ptr nav_id_node;
SGPropertyNode_ptr id_c1_node;
SGPropertyNode_ptr id_c2_node;
SGPropertyNode_ptr id_c3_node;
SGPropertyNode_ptr id_c4_node;
// gps slaving support
SGPropertyNode_ptr nav_slaved_to_gps_node;
SGPropertyNode_ptr gps_cdi_deflection_node;
SGPropertyNode_ptr gps_to_flag_node;
SGPropertyNode_ptr gps_from_flag_node;
SGPropertyNode_ptr gps_has_gs_node;
// internal (private) values
int play_count;
time_t last_time;
FGNavRecordPtr _navaid;
FGNavRecordPtr _gs;
string nav_fx_name;
string dme_fx_name;
bool has_dme;
double target_radial;
SGVec3d gs_base_vec;
SGTimeStamp prev_time;
SGTimeStamp curr_time;
double effective_range;
double target_gs;
double twist;
double horiz_vel;
double last_x;
double last_loc_dist;
double last_xtrack_error;
string _name;
int _num;
// internal periodic station search timer
double _time_before_search_sec;
// CDI properties
bool _toFlag, _fromFlag;
double _cdiDeflection;
double _cdiCrossTrackErrorM;
double _gsNeedleDeflection;
double _gsNeedleDeflectionNorm;
bool updateWithPower(double aDt);
// model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
double adjustNavRange( double stationElev, double aircraftElev,
double nominalRange );
// model standard ILS service volumes as per AIM 1-1-9
double adjustILSRange( double stationElev, double aircraftElev,
double offsetDegrees, double distance );
void updateAudio();
void audioNavidChanged();
void updateReceiver(double dt);
void updateGlideSlope(double dt, const SGVec3d& aircraft, double signal_quality_norm);
void updateGPSSlaved();
void updateCDI(double dt);
void clearOutputs();
FGNavRecord* findPrimaryNavaid(const SGGeod& aPos, double aFreqMHz);
public:
FGNavRadio(SGPropertyNode *node);
~FGNavRadio();
void init ();
void bind ();
void unbind ();
void update (double dt);
// Update nav/adf radios based on current postition
void search ();
};
#endif // _FG_NAVRADIO_HXX