Two (unrelated) glideslope things: 1) I tested making the has-gs property be based upon the GS range check (leaving aside any discussion of how GS reception range should be calculated). This is good, because existing panels generally use has-gs as a 'valid GS signal being received', to un-park / show the needle/pointer.
The catch is, most of the flightdirector / autopilot scripts have been written assuming that when approach mode is *armed*, has-gs is already true. I.e they don't arm GS holding, if no valid GS is being received at that point. It feels like this is a genuine problem - depending on how far out the localiser is captured, and given that you could be intercepting the localiser from an angle, I *guess* the real-life equipment wouldn't assume a valid GS signal was being received at that time. What do the real world pilots say? The 'fix' would be to remove the 'has-gs' flag checks from the various autopilot/flight-director Nasal scripts, which I'm not exactly thrilled at the prospect of - but it would make the GS needle/pointer behaviour more correct 'for free'. 2) Torsten noted the GS signal behaves very erratically below a certain elevation (above the landing threshold) - on the order of 100-150ft. I'm going to do some testing to establish the cause (aside from the dreaded penaltyForNav / double-ended-ILS-runway mess), but I have a suspicion the false lobes might be a factor. Would it be reasonable to disable the false lobes below a certain distance to the GS transmitter (at a guess, something like 1000m?). I know it's an unpleasant rule to add, but the current GS behaviour makes CAT-III or auto-land operation impossible, I think. I still need to verify that the false lobes are the cause, I don't necessarily see why they should be. Regards, 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
