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Add a "signed" distance to the GS transmitter. When you are in the approach

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hemisphere the distance is positive, if you are in the departure hemisphere
the distance is negature.  (Possible use for graphing approach distance
vs. glide slope or cdi.)
This commit is contained in:
curt 2003-01-22 01:24:32 +00:00
parent 44c16f986d
commit 29a3525869
3 changed files with 28 additions and 4 deletions
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25
src/Cockpit/navcom.cxx
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@ -323,12 +323,33 @@ FGNavCom::update(double dt)
if ( nav_has_gs ) {
station = Point3D( nav_gs_x, nav_gs_y, nav_gs_z );
nav_gs_dist = aircraft.distance3D( station );
// wgs84 heading to glide slope
geo_inverse_wgs_84( elev,
lat * SGD_RADIANS_TO_DEGREES,
lon * SGD_RADIANS_TO_DEGREES,
nav_gslat, nav_gslon,
&az1, &az2, &s );
double r = az1 - nav_radial;
while ( r > 180.0 ) { r -= 360.0;}
while ( r < -180.0 ) { r += 360.0;}
if ( r >= -90.0 && r <= 90.0 ) {
nav_gs_dist_signed = nav_gs_dist;
} else {
nav_gs_dist_signed = -nav_gs_dist;
}
/* cout << "Target Radial = " << nav_radial
<< " Bearing = " << az1
<< " dist (signed) = " << nav_gs_dist_signed
<< endl; */
} else {
nav_gs_dist = 0.0;
}
// wgs84 heading
geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
// wgs84 heading to localizer
geo_inverse_wgs_84( elev,
lat * SGD_RADIANS_TO_DEGREES,
lon * SGD_RADIANS_TO_DEGREES,
nav_loclat, nav_loclon,
&az1, &az2, &s );
// cout << "az1 = " << az1 << " magvar = " << nav_magvar << endl;

2
src/Cockpit/navcom.hxx
View file

@ -103,6 +103,7 @@ class FGNavCom : public FGSubsystem
double nav_gs_y;
double nav_gs_z;
double nav_gs_dist;
double nav_gs_dist_signed;
SGTimeStamp prev_time;
SGTimeStamp curr_time;
double nav_elev;
@ -208,6 +209,7 @@ public:
inline double get_nav_gslon() const { return nav_gslon; }
inline double get_nav_gslat() const { return nav_gslat; }
inline double get_nav_gs_dist() const { return nav_gs_dist; }
inline double get_nav_gs_dist_signed() const { return nav_gs_dist_signed; }
inline double get_nav_elev() const { return nav_elev; }
inline double get_nav_heading() const { return nav_heading; }
inline double get_nav_radial() const { return nav_radial; }

5
src/Network/native_gui.cxx
View file

@ -154,8 +154,9 @@ void FGProps2NetGUI( FGNetGUI *net ) {
if ( current_radiostack->get_navcom1()->get_nav_loc() ) {
// is an ILS
net->dist_nm = current_radiostack->get_navcom1()->get_nav_gs_dist()
* SG_METER_TO_NM;
net->dist_nm
= current_radiostack->get_navcom1()->get_nav_gs_dist_signed()
* SG_METER_TO_NM;
} else {
// is a VOR
net->dist_nm = current_radiostack->get_navcom1()->get_nav_loc_dist()