Rafael Helispot is/was an Israeli system for non-line of sight infrasound detection and triangulation of battlefield helicopters that was developed in several marks.
All I have about it is this:
https://irp.fas.org/agency/dod/jason/infrasound.pdf
mentions possible further source: "Srour, N...
acoustic modem
anti-helicopter
armamentdevelopmentauthority (israel)
battlefield air defence
cold war
early 21st century
infrasound
israel
late 20th century
post-cold war
rafael
rafael armamentdevelopmentauthority ltd.
war on terror
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