My mind turned to QRSS beaconing. For this to be possible it would be necessary to divert the beam when the QRSS was not on. One possibility would be to have a loudspeaker with a mirrored sheet (kitchen foil?) over it with a tone keyed. It would also be necessary to have a receiver that was optimised for daylight. I have no idea how good this would be.
I guess the same idea could be used for speech. The mirror would be deformed as speech was said. I seem to recall there was a 19th century patent for this called the Photophone. For speech I guess one could simply speak against the metal foil mirror.
I would imagine an optimised system could be used for over-the-horizon (NLOS) tests. Sadly, my health these days means I can only dream about this. It may already have been tried.
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