On 01/02/2009 03:28 PM, Alex Perry wrote: >From the point of view of implementation in a simulator, just take the > actual slope number for a specific runway and combine that with the > aircraft's position to generate a ratio. Repair the ratio to allow > for the side lobes (which as I recall are the standard series with a > negative at 6 and one you can follow at 9). Then pass that ratio to > the instrument implementation.
I agree with all of that. And I have implemented it in the code, including the extra lobes i.e. false glide slopes. =========== Tangential remark: I am surprised by this reference: http://www.freepatentsonline.com/3757338.html which alleges For reasons well known to those skilled in the art but to minor importance here, the first significant side lobe, that is a side lobe which comprises a stable false glide slope indistinguishable from the true glide slope except for its steepness, occurs at 5A. I'm wondering if that's a typo. A 9 degree false glideslope is more-or-less followable but a 15 degree false GS would be too steep to be followable without extraordinary effort. I've seen students actually capture and try to follow a false GS. It's not easy but it can be done. So I've implemented 6-degree periodicity, i.e. 3, 6r, 9, 12r, etc. where "r" means reverse sensing. OTOH it might not be a typo. I haven't worked out the electrodynamics of the situation, so I can't be sure what's actually going on. ------------------------------------------------------------------------------ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
