On 12/31/2008 11:46 PM, Alex Perry wrote: > I've observed this variation in sensitivity in practical operations. We > can get away with using the 0.5 degree rule, but I'd prefer us to > perform the divide-and-constrain that John describes.
I've got most of the code to do this. In the absence of any clipping, some rather extreme examples include: At Kennedy: IMOH localizer axis: 4771.2 m ==> +- 1.28109 full scale or 0.256217 degrees per dot At Robert J. Miller: IMJX localizer axis: 1964.73 m ==> +- 3.11101 full scale or 0.622203 degrees per dot > If you want more > detail than the handwave that the AIM contains, go read the FAA > technical manual on how to design and deploy LOC antenna arrays .. I don't have a copy of this. Does anybody have it, or a pointer? ======= All indications are that for short runways, the width is not allowed to exceed 6 degrees peg-to-peg (peg at +- 3). I gather that "few" airports operate with less than 3 degrees peg-to-peg (peg at +- 1.5), even if the runway is very long. I get the impression there may be some discretion. I propose to clip it at 3 for now, subject to change if/when we get better information. In any case, if the Kennedy localizer is really set for 2.56 peg-to-peg, approximating it by 3 is a lot better than approximating it by 5, which is what version 1.9.0 and all previous versions have done. ------------------------------------------------------------------------------ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
