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Navradio: provide property is-localizer-frequency

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This property is true if the active frequency is tuned to a
paired LOC/GS frequency in the range 108.00 - 111.95 with a
odd 100kHz digit (108.10, 108.15, 108.30, 108.35 ...)
It only indicates, that this _is_ a LOC/GS frequency,
it does _not_ provide any indication if a LOC/GS station is
actually being received.
This commit is contained in:
Torsten Dreyer 2012-02-15 22:43:15 +01:00
parent 4da0760edd
commit c5eba72c75
2 changed files with 13 additions and 0 deletions
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12
src/Instrumentation/navradio.cxx
View file

@ -201,6 +201,7 @@ FGNavRadio::init ()
alt_freq_node = subnode->getChild("standby-mhz", 0, true);
fmt_freq_node = subnode->getChild("selected-mhz-fmt", 0, true);
fmt_alt_freq_node = subnode->getChild("standby-mhz-fmt", 0, true);
is_loc_freq_node = subnode->getChild("is-localizer-frequency", 0, true );
// radials
subnode = node->getChild("radials", 0, true);
@ -346,6 +347,16 @@ double FGNavRadio::adjustILSRange( double stationElev, double aircraftElev,
return FG_LOC_DEFAULT_RANGE;
}
// Frequencies with odd 100kHz numbers in the range from 108.00 - 111.95
// are LOC/GS (ILS) frequency pairs
// (108.00, 108.05, 108.20, 108.25.. =VOR)
// (108.10, 108.15, 108.30, 108.35.. =ILS)
static inline bool IsLocalizerFrequency( double f )
{
if( f < 108.0 || f >= 112.00 ) return false;
return (((SGMiscd::roundToInt(f * 100.0) % 100)/10) % 2) != 0;
}
//////////////////////////////////////////////////////////////////////////
// Update the various nav values based on position and valid tuned in navs
@ -364,6 +375,7 @@ FGNavRadio::update(double dt)
fmt_freq_node->setStringValue(tmp);
sprintf( tmp, "%.2f", alt_freq_node->getDoubleValue() );
fmt_alt_freq_node->setStringValue(tmp);
is_loc_freq_node->setBoolValue( IsLocalizerFrequency( freq_node->getDoubleValue() ));
if (power_btn_node->getBoolValue()
&& (bus_power_node->getDoubleValue() > 1.0)

1
src/Instrumentation/navradio.hxx
View file

@ -53,6 +53,7 @@ class FGNavRadio : public SGSubsystem, public SGPropertyChangeListener
SGPropertyNode_ptr power_btn_node;
SGPropertyNode_ptr freq_node; // primary freq
SGPropertyNode_ptr alt_freq_node; // standby freq
SGPropertyNode_ptr is_loc_freq_node;// is the primary freq a loc/gs (paired) freq?
SGPropertyNode_ptr sel_radial_node; // selected radial
SGPropertyNode_ptr vol_btn_node;
SGPropertyNode_ptr ident_btn_node;