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Jason Fayre

best way to detect localizer

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Hello,

I'm looking at the offsets and trying to figure what is the best way to determine if nav1 detects a localiser and glide slope. I think I saw a glide slope detected flag, but I don't see anything for localiser. Would I just use the localiser signal offset?

 

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4 hours ago, Jason Fayre said:

I'm looking at the offsets and trying to figure what is the best way to determine if nav1 detects a localiser and glide slope. I think I saw a glide slope detected flag, but I don't see anything for localiser. Would I just use the localiser signal offset?

Localisers aren't like regular VORs. They either activate your needle or they don't. There are several ways to detect this -- see the offsets from 0C48 to 0C70.  Once determined that it is a LOC not a VOR (see code flag bit 2^7 in offsets 0C4D and 0C70) the sure indication of detection for a needle signal is the 256 seen in offset 0C52 or 0C62. (for NAV1 or NAV2)

But really there's a superfluity of information there for you to use, so there are many ways from which you can choose.

Pete

 

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