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From: Wanderer<dont@emailme.com>
Newsgroups: sci.electronics.design
Subject: Re: IR detector again
Date: Mon, 11 Nov 2024 04:48:33
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On  Mon, 11 Nov 2024, Hul Tytus wrote.

>   Klaus, you might mount the tubes at a slight outward angle. >When one is 
>saturated steer toward the other.
>   R V Jones' "Most Secret War", which Phil mentioned, describes >a German 
>navigational aide that quided aircraft on landing. Two beams were >lined 
>up with the runway but diverging a few degrees. The pilot >approached 
>keeping the reception of the beams equal.
>   Your approach has a higher frequency with reciever/transmiter 
>altered some. All in all though, suprisingly similar.
>
>Hul

It's the fly's ear problem. The fly's ear does this mechanically. You take
the sum and the difference of two signals. If the sum is high enough you
have signal. Then the difference tells you the direction. You try to zero 
the difference while maintaining the sum to fly straight at the signal.