# include <config.h>
#endif
-#if defined( FG_HAVE_NATIVE_SGI_COMPILERS )
-# include <iostream.h>
-#else
-# include <iostream>
-#endif
+#include <simgear/compiler.h>
+
+#include STL_IOSTREAM
#include <simgear/constants.h>
#include <simgear/math/sg_types.hxx>
#include <simgear/misc/props.hxx>
+
+#include <Main/fg_props.hxx>
#include <Aircraft/aircraft.hxx>
-#include <Main/options.hxx>
-#include <Main/bfi.hxx>
-#include <NetworkOLK/features.hxx>
+#ifdef FG_WEATHERCM
+# include <WeatherCM/FGLocalWeatherDatabase.h>
+#else
+# include <Environment/environment_mgr.hxx>
+# include <Environment/environment.hxx>
+#endif
-FG_USING_NAMESPACE(std);
+SG_USING_NAMESPACE(std);
#include "radiostack.hxx"
#include "steam.hxx"
\f
////////////////////////////////////////////////////////////////////////
-// Declare the functions that read the variables
+// Constructor and destructor.
////////////////////////////////////////////////////////////////////////
-// Anything that reads the BFI directly is not implemented at all!
-
-
-double FGSteam::the_STATIC_inhg = 29.92;
-double FGSteam::the_ALT_ft = 0.0;
-double FGSteam::get_ALT_ft() { _CatchUp(); return the_ALT_ft; }
-
-double FGSteam::get_ASI_kias() { return FGBFI::getAirspeed(); }
+FGSteam::FGSteam ()
+ :
+ the_ALT_ft(0.0),
+ the_ALT_datum_mb(1013.0),
+ the_TC_rad(0.0),
+ the_TC_std(0.0),
+ the_STATIC_inhg(29.92),
+ the_VACUUM_inhg(0.0),
+ the_VSI_fps(0.0),
+ the_VSI_case(29.92),
+ the_MH_deg(0.0),
+ the_MH_degps(0.0),
+ the_MH_err(0.0),
+ the_DG_deg(0.0),
+ the_DG_degps(0.0),
+ the_DG_inhg(0.0),
+ the_DG_err(0.0),
+ _UpdateTimePending(1000000)
+{
+}
-double FGSteam::the_VSI_case = 29.92;
-double FGSteam::the_VSI_fps = 0.0;
-double FGSteam::get_VSI_fps() { _CatchUp(); return the_VSI_fps; }
+FGSteam::~FGSteam ()
+{
+}
-double FGSteam::the_VACUUM_inhg = 0.0;
-double FGSteam::get_VACUUM_inhg() { _CatchUp(); return the_VACUUM_inhg; }
+void
+FGSteam::init ()
+{
+ _heading_deg_node = fgGetNode("/orientation/heading-deg", true);
+ _mag_var_deg_node = fgGetNode("/environment/magnetic-variation-deg", true);
+ _mag_dip_deg_node = fgGetNode("/environment/magnetic-dip-deg", true);
+ _engine_0_rpm_node = fgGetNode("/engines/engine[0]/rpm", true);
+ _pressure_inhg_node = fgGetNode("environment/pressure-inhg", true);
+}
-double FGSteam::the_MH_err = 0.0;
-double FGSteam::the_MH_deg = 0.0;
-double FGSteam::the_MH_degps = 0.0;
-double FGSteam::get_MH_deg () { _CatchUp(); return the_MH_deg; }
+void
+FGSteam::update (double dt_sec)
+{
+ _UpdateTimePending += dt_sec;
+ _CatchUp();
+}
-double FGSteam::the_DG_err = 0.0;
-double FGSteam::the_DG_deg = 0.0;
-double FGSteam::the_DG_degps = 0.0;
-double FGSteam::the_DG_inhg = 0.0;
-double FGSteam::get_DG_deg () { _CatchUp(); return the_DG_deg; }
-double FGSteam::get_DG_err () { _CatchUp(); return the_DG_err; }
+void
+FGSteam::bind ()
+{
+ fgTie("/steam/airspeed-kt", this, &FGSteam::get_ASI_kias);
+ fgSetArchivable("/steam/airspeed-kt");
+ fgTie("/steam/altitude-ft", this, &FGSteam::get_ALT_ft);
+ fgSetArchivable("/steam/altitude-ft");
+ fgTie("/steam/altimeter-datum-mb", this,
+ &FGSteam::get_ALT_datum_mb, &FGSteam::set_ALT_datum_mb,
+ false); /* don't modify the value */
+ fgSetArchivable("/steam/altimeter-datum-mb");
+ fgTie("/steam/turn-rate", this, &FGSteam::get_TC_std);
+ fgSetArchivable("/steam/turn-rate");
+ fgTie("/steam/slip-skid",this, &FGSteam::get_TC_rad);
+ fgSetArchivable("/steam/slip-skid");
+ fgTie("/steam/vertical-speed-fps", this, &FGSteam::get_VSI_fps);
+ fgSetArchivable("/steam/vertical-speed-fps");
+ fgTie("/steam/gyro-compass-deg", this, &FGSteam::get_DG_deg);
+ fgSetArchivable("/steam/gyro-compass-deg");
+ // fgTie("/steam/adf-deg", FGSteam::get_HackADF_deg);
+ // fgSetArchivable("/steam/adf-deg");
+ fgTie("/steam/gyro-compass-error-deg", this,
+ &FGSteam::get_DG_err, &FGSteam::set_DG_err,
+ false); /* don't modify the value */
+ fgSetArchivable("/steam/gyro-compass-error-deg");
+ fgTie("/steam/mag-compass-deg", this, &FGSteam::get_MH_deg);
+ fgSetArchivable("/steam/mag-compass-deg");
+}
-void FGSteam::set_DG_err ( double approx_magvar ) {
- the_DG_err = approx_magvar;
+void
+FGSteam::unbind ()
+{
+ fgUntie("/steam/airspeed-kt");
+ fgUntie("/steam/altitude-ft");
+ fgUntie("/steam/altimeter-datum-mb");
+ fgUntie("/steam/turn-rate");
+ fgUntie("/steam/slip-skid");
+ fgUntie("/steam/vertical-speed-fps");
+ fgUntie("/steam/gyro-compass-deg");
+ fgUntie("/steam/gyro-compass-error-deg");
+ fgUntie("/steam/mag-compass-deg");
}
-double FGSteam::the_TC_rad = 0.0;
-double FGSteam::the_TC_std = 0.0;
-double FGSteam::get_TC_rad () { _CatchUp(); return the_TC_rad; }
-double FGSteam::get_TC_std () { _CatchUp(); return the_TC_std; }
\f
////////////////////////////////////////////////////////////////////////
-// Recording the current time
+// Declare the functions that read the variables
////////////////////////////////////////////////////////////////////////
+double
+FGSteam::get_ALT_ft () const
+{
+ return the_ALT_ft;
+}
+
+double
+FGSteam::get_ALT_datum_mb () const
+{
+ return the_ALT_datum_mb;
+}
+
+void
+FGSteam::set_ALT_datum_mb (double datum_mb)
+{
+ the_ALT_datum_mb = datum_mb;
+}
+
+double
+FGSteam::get_ASI_kias () const
+{
+ return fgGetDouble("/velocities/airspeed-kt");
+}
-int FGSteam::_UpdatesPending = 1000000; /* Forces filter to reset */
+double
+FGSteam::get_VSI_fps () const
+{
+ return the_VSI_fps;
+}
+double
+FGSteam::get_VACUUM_inhg () const
+{
+ return the_VACUUM_inhg;
+}
-void FGSteam::update ( int timesteps )
+double
+FGSteam::get_MH_deg () const
{
- if (!isTied) {
- isTied = true;
- current_properties.tieDouble("/steam/airspeed",
- FGSteam::get_ASI_kias);
- current_properties.tieDouble("/steam/altitude",
- FGSteam::get_ALT_ft);
- current_properties.tieDouble("/steam/turn-rate",
- FGSteam::get_TC_std);
- current_properties.tieDouble("/steam/slip-skid",
- FGSteam::get_TC_rad);
- current_properties.tieDouble("/steam/vertical-speed",
- FGSteam::get_VSI_fps);
- current_properties.tieDouble("/steam/gyro-compass",
- FGSteam::get_DG_deg);
- current_properties.tieDouble("/steam/vor1",
- FGSteam::get_HackVOR1_deg);
- current_properties.tieDouble("/steam/vor2",
- FGSteam::get_HackVOR2_deg);
- current_properties.tieDouble("/steam/glidescope1",
- FGSteam::get_HackGS_deg);
- current_properties.tieDouble("/steam/adf",
- FGSteam::get_HackADF_deg);
- current_properties.tieDouble("/steam/gyro-compass-error",
- FGSteam::get_DG_err,
- FGSteam::set_DG_err);
- current_properties.tieDouble("/steam/mag-compass",
- FGSteam::get_MH_deg);
- }
- _UpdatesPending += timesteps;
+ return the_MH_deg;
+}
+
+double
+FGSteam::get_DG_deg () const
+{
+ return the_DG_deg;
+}
+
+double
+FGSteam::get_DG_err () const
+{
+ return the_DG_err;
+}
+
+void
+FGSteam::set_DG_err (double approx_magvar)
+{
+ the_DG_err = approx_magvar;
+}
+
+double
+FGSteam::get_TC_rad () const
+{
+ return the_TC_rad;
+}
+
+double
+FGSteam::get_TC_std () const
+{
+ return the_TC_std;
}
+\f
+////////////////////////////////////////////////////////////////////////
+// Recording the current time
+////////////////////////////////////////////////////////////////////////
+
+
+/* tc should be (elapsed_time_between_updates / desired_smoothing_time) */
void FGSteam::set_lowpass ( double *outthe, double inthe, double tc )
{
if ( tc < 0.0 )
}
} else
if ( tc < 0.2 )
- { /* Normal mode of operation */
+ { /* Normal mode of operation; fast approximation to exp(-tc) */
(*outthe) = (*outthe) * ( 1.0 - tc )
+ inthe * tc;
} else
}
+#define INHG_TO_MB 33.86388 /* Inches_of_mercury * INHG_TO_MB == millibars. */
+
+// Convert air pressure to altitude by ICAO Standard Atmosphere
+double pressInHgToAltFt(double p_inhg)
+{
+ // Ref. Aviation Formulary, Ed Williams, www.best.com/~williams/avform.htm
+ const double P_0 = 29.92126; // Std. MSL pressure, inHg. (=1013.25 mb)
+ const double p_Tr = 0.2233609 * P_0; // Pressure at tropopause, same units.
+ const double h_Tr = 36089.24; // Alt of tropopause, ft. (=11.0 km)
+
+ if (p_inhg > p_Tr) // 0.0 to 11.0 km
+ return (1.0 - pow((p_inhg / P_0), 1.0 / 5.2558797)) / 6.8755856e-6;
+ return h_Tr + log10(p_inhg / p_Tr) / -4.806346e-5; // 11.0 to 20.0 km
+ // We could put more code for higher altitudes here.
+}
+
+
+// Convert altitude to air pressure by ICAO Standard Atmosphere
+double altFtToPressInHg(double alt_ft)
+{
+ // Ref. Aviation Formulary, Ed Williams, www.best.com/~williams/avform.htm
+ const double P_0 = 29.92126; // Std. MSL pressure, inHg. (=1013.25 mb)
+ const double p_Tr = 0.2233609 * P_0; // Pressure at tropopause, same units.
+ const double h_Tr = 36089.24; // Alt of tropopause, ft. (=11.0 km)
+
+ if (alt_ft < h_Tr) // 0.0 to 11.0 km
+ return P_0 * pow(1.0 - 6.8755856e-6 * alt_ft, 5.2558797);
+ return p_Tr * exp(-4.806346e-5 * (alt_ft - h_Tr)); // 11.0 to 20.0 km
+ // We could put more code for higher altitudes here.
+}
+
+
\f
////////////////////////////////////////////////////////////////////////
// Here the fun really begins
void FGSteam::_CatchUp()
-{ if ( _UpdatesPending != 0 )
- { double dt = _UpdatesPending * 1.0 /
- globals->get_options()->get_model_hz();
+{
+ if ( _UpdateTimePending != 0 )
+ {
+ double dt = _UpdateTimePending;
double AccN, AccE, AccU;
- int i /*,j*/;
+ /* int i, j; */
double d, the_ENGINE_rpm;
-#if 0
- /**************************
- There is the possibility that this is the first call.
- If this is the case, we will emit the feature registrations
- just to be on the safe side. Doing it more than once will
- waste CPU time but doesn't hurt anything really.
- */
- if ( _UpdatesPending > 999999 )
- { FGFeature::register_int ( "Avionics/NAV1/Localizer", &NAV1_LOC );
- FGFeature::register_double ( "Avionics/NAV1/Latitude", &NAV1_Lat );
- FGFeature::register_double ( "Avionics/NAV1/Longitude", &NAV1_Lon );
- FGFeature::register_double ( "Avionics/NAV1/Radial", &NAV1_Rad );
- FGFeature::register_double ( "Avionics/NAV1/Altitude", &NAV1_Alt );
- FGFeature::register_int ( "Avionics/NAV2/Localizer", &NAV2_LOC );
- FGFeature::register_double ( "Avionics/NAV2/Latitude", &NAV2_Lat );
- FGFeature::register_double ( "Avionics/NAV2/Longitude", &NAV2_Lon );
- FGFeature::register_double ( "Avionics/NAV2/Radial", &NAV2_Rad );
- FGFeature::register_double ( "Avionics/NAV2/Altitude", &NAV2_Alt );
- FGFeature::register_double ( "Avionics/ADF/Latitude", &ADF_Lat );
- FGFeature::register_double ( "Avionics/ADF/Longitude", &ADF_Lon );
- }
-#endif
-
/**************************
Someone has called our update function and
it turns out that we are running somewhat behind.
More subtle flaw is having it not move or a travel limit
occasionally due to some dirt in the tube or on the ball.
*/
- // the_TC_rad = - ( FGBFI::getSideSlip () ); /* incorrect */
- d = - current_aircraft.fdm_state->get_A_Z_pilot();
+ d = -current_aircraft.fdm_state->get_A_Z_pilot();
if ( d < 1 ) d = 1;
set_lowpass ( & the_TC_rad,
current_aircraft.fdm_state->get_A_Y_pilot () / d,
*/
set_lowpass ( & the_TC_std,
current_aircraft.fdm_state->get_Phi_dot ()
- * RAD_TO_DEG / 20.0 +
+ * SGD_RADIANS_TO_DEGREES / 20.0 +
current_aircraft.fdm_state->get_Psi_dot ()
- * RAD_TO_DEG / 3.0 , dt );
+ * SGD_RADIANS_TO_DEGREES / 3.0 , dt );
/**************************
We want to know the pilot accelerations,
AccN = current_aircraft.fdm_state->get_V_dot_north();
AccE = current_aircraft.fdm_state->get_V_dot_east();
AccU = current_aircraft.fdm_state->get_V_dot_down()
- - 9.81 / 0.3;
- if ( fabs(the_TC_rad) > 0.2 )
+ - 9.81 * SG_METER_TO_FEET;
+ if ( fabs(the_TC_rad) > 0.2 /* 2.0 */ )
{ /* Massive sideslip jams it; it stops turning */
the_MH_degps = 0.0;
- the_MH_err = FGBFI::getHeading () - the_MH_deg;
+ the_MH_err = _heading_deg_node->getDoubleValue() - the_MH_deg;
} else
{ double MagDip, MagVar, CosDip;
double FrcN, FrcE, FrcU, AccTot;
double EdgN, EdgE, EdgU;
double TrqN, TrqE, TrqU, Torque;
/* Find a force vector towards exact magnetic north */
- MagVar = FGBFI::getMagVar() / RAD_TO_DEG;
- MagDip = FGBFI::getMagDip() / RAD_TO_DEG;
+ MagVar = _mag_var_deg_node->getDoubleValue()
+ / SGD_RADIANS_TO_DEGREES;
+ MagDip = _mag_var_deg_node->getDoubleValue()
+ / SGD_RADIANS_TO_DEGREES;
CosDip = cos ( MagDip );
FrcN = CosDip * cos ( MagVar );
FrcE = CosDip * sin ( MagVar );
if ( AccTot > 1.0 ) AccTot = sqrt ( AccTot );
else AccTot = 1.0;
/* Force applies to north marking on compass card */
- EdgN = cos ( the_MH_err / RAD_TO_DEG );
- EdgE = sin ( the_MH_err / RAD_TO_DEG );
+ EdgN = cos ( the_MH_err / SGD_RADIANS_TO_DEGREES );
+ EdgE = sin ( the_MH_err / SGD_RADIANS_TO_DEGREES );
EdgU = 0.0;
/* Apply the force to the edge to get torques */
TrqN = EdgE * FrcU - EdgU * FrcE;
}
if ( the_MH_err > 180.0 ) the_MH_err -= 360.0; else
if ( the_MH_err < -180.0 ) the_MH_err += 360.0;
- the_MH_deg = FGBFI::getHeading () - the_MH_err;
+ the_MH_deg = _heading_deg_node->getDoubleValue() - the_MH_err;
}
/**************************
scaling capability for the vacuum pump later on.
When we have a real engine model, we can ask it.
*/
- the_ENGINE_rpm = FGBFI::getThrottle() * 26.0;
+ the_ENGINE_rpm = _engine_0_rpm_node->getDoubleValue();
/**************************
- This is just temporary, until the static source works,
- so we just filter the actual value by one second to
+ First, we need to know what the static line is reporting,
+ which is a whole simulation area in itself.
+ We filter the actual value by one second to
account for the line impedance of the plumbing.
*/
- set_lowpass ( & the_ALT_ft, FGBFI::getAltitude(), dt );
+#ifdef FG_WEATHERCM
+ sgVec3 plane_pos = { cur_fdm_state->get_Latitude(),
+ cur_fdm_state->get_Longitude(),
+ cur_fdm_state->get_Altitude() * SG_FEET_TO_METER };
+ double static_inhg = WeatherDatabase->get(plane_pos).AirPressure *
+ (0.01 / INHG_TO_MB);
+#else
+ double static_inhg = _pressure_inhg_node->getDoubleValue();
+#endif
- /**************************
- First, we need to know what the static line is reporting,
- which is a whole simulation area in itself. For now, we cheat.
- */
- the_STATIC_inhg = 29.92;
- i = (int) the_ALT_ft;
- while ( i > 9000 )
- { the_STATIC_inhg *= 0.707;
- i -= 9000;
- }
- the_STATIC_inhg *= ( 1.0 - 0.293 * i / 9000.0 );
+ set_lowpass ( & the_STATIC_inhg, static_inhg, dt );
/*
NO alternate static source error (student feature),
NO slip-induced error, important for C172 for example.
*/
+ /**************************
+ Altimeter.
+ ICAO standard atmosphere MSL pressure is 1013.25 mb, and pressure
+ gradient is about 28 ft per mb at MSL increasing to about 32 at
+ 5000 and 38 at 10000 ft.
+ Standard altimeters apply the subscale offset to the output altitude,
+ not to the input pressure; I don't know exactly what pressure gradient
+ they assume for this. I choose to make it accurate at low altitudes.
+ Remember, we are trying to simulate a real altimeter, not an ideal one.
+ */
+ set_lowpass ( & the_ALT_ft,
+ pressInHgToAltFt(the_STATIC_inhg) +
+ (the_ALT_datum_mb - 1013.25) * 28.0, /* accurate at low alt. */
+ dt * 10 ); /* smoothing time 0.1 s */
+
/**************************
The VSI case is a low-pass filter of the static line pressure.
The instrument reports the difference, scaled to approx ft.
> have it tumble when you exceed the usual pitch or bank limits,
> put in those insidious turning errors ... for now anyway.
*/
- if ( _UpdatesPending > 999999 )
- the_DG_err = FGBFI::getMagVar();
+ if ( _UpdateTimePending > 999999 )
+ the_DG_err = fgGetDouble("/environment/magnetic-variation-deg");
the_DG_degps = 0.01; /* HACK! */
if (dt<1.0) the_DG_err += dt * the_DG_degps;
- the_DG_deg = FGBFI::getHeading () - the_DG_err;
+ the_DG_deg = _heading_deg_node->getDoubleValue() - the_DG_err;
/**************************
Finished updates, now clear the timer
*/
- _UpdatesPending = 0;
+ _UpdateTimePending = 0;
} else {
// cout << "0 Updates pending" << endl;
}
// Everything below is a transient hack; expect it to disappear
////////////////////////////////////////////////////////////////////////
-
-double FGSteam::get_HackGS_deg () {
- if ( current_radiostack->get_nav1_inrange() &&
- current_radiostack->get_nav1_has_gs() )
- {
- double x = current_radiostack->get_nav1_gs_dist();
- double y = (FGBFI::getAltitude() - current_radiostack->get_nav1_elev())
- * FEET_TO_METER;
- double angle = atan2( y, x ) * RAD_TO_DEG;
- return (current_radiostack->get_nav1_target_gs() - angle) * 5.0;
- } else {
- return 0.0;
- }
-}
-
-
-double FGSteam::get_HackVOR1_deg () {
- double r;
-
- if ( current_radiostack->get_nav1_inrange() ) {
- if ( current_radiostack->get_nav1_loc() ) {
- // localizer doesn't need magvar offset
- r = current_radiostack->get_nav1_heading()
- - current_radiostack->get_nav1_radial();
- } else {
- r = current_radiostack->get_nav1_heading() - FGBFI::getMagVar()
- - current_radiostack->get_nav1_radial();
- }
- // cout << "Radial = " << current_radiostack->get_nav1_radial()
- // << " Bearing = " << current_radiostack->get_nav1_heading()
- // << endl;
-
- if (r> 180.0) r-=360.0; else
- if (r<-180.0) r+=360.0;
- if ( fabs(r) > 90.0 )
- r = ( r<0.0 ? -r-180.0 : -r+180.0 );
- // According to Robin Peel, the ILS is 4x more sensitive than a vor
- if ( current_radiostack->get_nav1_loc() ) r *= 4.0;
- } else {
- r = 0.0;
- }
-
- return r;
-}
-
-
-double FGSteam::get_HackVOR2_deg () {
- double r;
-
- if ( current_radiostack->get_nav2_inrange() ) {
- if ( current_radiostack->get_nav2_loc() ) {
- // localizer doesn't need magvar offset
- r = current_radiostack->get_nav2_heading()
- - current_radiostack->get_nav2_radial();
- } else {
- r = current_radiostack->get_nav2_heading() - FGBFI::getMagVar()
- - current_radiostack->get_nav2_radial();
- }
- // cout << "Radial = " << current_radiostack->get_nav1_radial()
- // << " Bearing = " << current_radiostack->get_nav1_heading() << endl;
-
- if (r> 180.0) r-=360.0; else
- if (r<-180.0) r+=360.0;
- if ( fabs(r) > 90.0 )
- r = ( r<0.0 ? -r-180.0 : -r+180.0 );
- } else {
- r = 0.0;
- }
-
- return r;
-}
-
-
-double FGSteam::get_HackOBS1_deg () {
- return current_radiostack->get_nav1_radial();
-}
-
-
-double FGSteam::get_HackOBS2_deg () {
- return current_radiostack->get_nav2_radial();
+double FGSteam::get_HackOBS1_deg () const
+{
+ return current_radiostack->get_navcom1()->get_nav_radial();
}
-
-double FGSteam::get_HackADF_deg () {
- double r;
-
- if ( current_radiostack->get_adf_inrange() ) {
- r = current_radiostack->get_adf_heading() - FGBFI::getHeading();
-
- // cout << "Radial = " << current_radiostack->get_adf_heading()
- // << " Heading = " << FGBFI::getHeading() << endl;
- } else {
- r = 0.0;
- }
-
- return r;
+double FGSteam::get_HackOBS2_deg () const
+{
+ return current_radiostack->get_navcom2()->get_nav_radial();
}
projects / flightgear.git / blobdiff