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ILS service volume issues
John Denker (talk | contribs) (fullscreen initialization) |
John Denker (talk | contribs) (ILS service volume issues) |
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priority. This makes both the log and the console record hard | priority. This makes both the log and the console record hard | ||
to interpret. | to interpret. | ||
==== Glideslope service volume. ==== | |||
The code in navradio.cxx appears to assume the glideslope | |||
service volume is the same as the localizer service | |||
volume. This is quite unrealistic. | |||
==== Extended service volume. ==== | |||
In some parts of the world, a goodly fraction of the | |||
localizers have an expanded service volume (ESV), | |||
often quite a bit larger than the standard service | |||
volume you see in the AIM. The code in navradio.cxx | |||
was ignoring the service volume information in the | |||
database and wrongly assuming the default values | |||
applied everywhere. Code to fix the range-related | |||
part of the problem has been offered | |||
but not yet incorporated. | |||
==== Other service volume issues ==== | |||
The code in navradio.cxx has no understanding of how | |||
'''azimuth''' affects the | |||
localizer. There is more to the story than reception range. | |||
It is perfectly possible to be outside the LOC service volume | |||
for reasons having to do with azimuth, not range. | |||
Good ident will be heard, but false localizer courses will | |||
cause serious trouble for the unwary pilot. | |||
Similar remarks apply to false glide slopes. | |||
The code would need to be significantly restructured to deal | |||
with this. | |||
== Missing Features and Traps for the Unwary == | == Missing Features and Traps for the Unwary == | ||