On Thu, Sep 10, 2009 at 9:37 AM, James Turner wrote:
>
> On 10 Sep 2009, at 11:15, James Turner wrote:
>
> > The last part I'm not totally sure about - it makes localizers
> > *very* sensitive - maybe I've adapted the code incorrectly, but this
> > doc:
> >
> > http://www.allstar.fiu.edu/aerojava/ILS.htm
> >
> > indicates that at 10nm, the beam should be approx 1m (statue or
> > nautical, I don't know) wide (with some variation for the runway
> > aspect formula) - and it feels much, much narrower than that to me,
> > though I haven't tested this rigourously.
>
> After some further testing, I'm happier that the LOC sensitivity is
> plausible, though I still think it's a bit narrow. This is based on
> flying (level) perpendicular to the localizer beam at 10nm out - if
> the width is really 1nm (which it may not be), I'd expect it to take
> 20 seconds for the needle to move from peg to peg at 180kts ground-
> speed (approximately). Instead it's much more rapid, on the order of
> four or five seconds.
>
> (I realise it's not the greatest methodology for verifying sensitivity)
>
You might double check units (for instance a degree to radian conversion
might be missing?)
Curt.
--
Curtis Olson: http://baron.flightgear.org/~curt/
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