On 14 Sep 2009, at 15:44, John Denker wrote: > Specifically, I recommend introducing dme_inrange > and gs_inrange properties. The concept of "dme in > range" and "gs in range" are meaningful to real > world pilots.
Yep, seems reasonable to me, I was already looking at the navradio DME patch. > Ninety percent of this erratic behavior is realistic! > > The other ten percent is a small problem, explained > by the fact that real-world GS receivers incorporate > a rather heavy low-pass filter ... so if you fly > through a region of rapidly-changing signals they > mostly average out ... and navradio.cxx has not > heretofore implemented such a filter. What's your confidence factor on the 90:10 split? I've never flow an ILS approach in my life, but I find it hard to believe the real world behaviour is as poor (close to the transmitter) as ours is now. > If you want to add a low-pass filter, that would > be a Good Thing. It is going to be needed anyway, > if/when we try to construct a decent model of > fringe-area behavior. Happy to do so - I'll experiment with this and post back here. If you wish to experiment with it yourself, and suggest some filter parameters that seem appropriate, I would be most grateful - otherwise I'll make some guesses, and we can tune later. > I guarantee you real-world autoland systems do not > try to follow the GS signal all the way to the > runway. Among other things, they rely on a fancy > radar altimeter to judge height during the flare. > > If existing aircraft have been following the GS > signal all the way to the runway, I'd say we have > _two_ bugs (unrealistically good GS signal, and > unrealistic autoland implementation). Yep, fair point. I don't think any aircraft we currently have claim an actual auto-land (as modelled) Cheers, James ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
