Hi Torsten,
Does this patch work with any aircraft and nav radio, or do the individual
aircraft need to be updated to match. I did a quick test in the default
c172 flying from SJC to SFO, but the SFO 28R ILS seemed to have rock solid
needle response even on the ground at SJC (26+ miles away) and the "TO" flag
is showing. This will be a nice addition, but I just want to make sure the
default behavior scales fairly close to reality.
Thanks,
Curt.
On Thu, Aug 28, 2008 at 2:04 PM, Torsten Dreyer wrote:
> Here is a little patch that changes the behaviour of the VOR CDI and
> OFF-flag
> for indicators like the HSI when getting outside the range of the VOR
> station.
>
> Currently, when flying at a distance between the effective_range and twice
> the
> effective_range of a VOR station, the in-range property is computed based
> on
> a random value, causing the OFF Flag and the CDI bar to perform an ugly
> jitter.
>
> The attached patch introduces a new property signal-quality-norm which is
> computed based on the distance to the station and the range. It is 1.0 when
> the distance is less than the range and decreases by 1/x^2 for distances
> greater than the range leading to a signal-quality-norm of 0.25 for
> distances
> two times the range, 0.125 for three times the range and so on.
> The in-range flag is tied to a signal-quality-norm greater than 0.2 (fixed
> squelch).
> The CDI and GS needle deflection is multiplied with the
> signal-quality-norm.
>
> The benefit is:
> - Ability to animate the OFF-Flag with a smooth transition.
> - CDI and GS needle deflection shows correct values when in range
> (signal-quality-norm=1.0) and show some wrong indication when the range is
> exceeded
> - CDI and GS needle start to move, even when the OFF flag is visible
> - No more jitter for flag and needles
>
> See the new SenecaII ki525a hsi as an example at
> http://www.t3r.de/fg/navpatch.jpg
> The numbers on the image are:
> (1) the new property signal-quality-norm
> (2) distance exceeds the effective-range by 30%
> (3) NAV flag has a rotation animation bound to signal-quality-norm and is
> partially visible
> (4) CDI is partially deflected even with NAV flag shown
>
> This implementation better matches reality - at least, how I observed it
> ;-)
>
> The attached patch is agains current HEAD.
>
> I hope the patch gets into CVS with the help of some kind commiter.
>
> Greetings, Torsten
>
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--
Curtis Olson: http://baron.flightgear.org/~curt/
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