acoustic modem

  1. L

    Rafael Helispot

    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...
    • lastdingo
    • Thread
    • acoustic modem anti-helicopter armament development authority (israel) battlefield air defence cold war early 21st century infrasound israel late 20th century post-cold war rafael rafael armament development authority ltd. war on terror
    • Replies: 9
    • Forum: Secret Army Projects
  2. Grey Havoc

    Distant Thunder / NetSAT littoral water system (DARPA)

    View: https://www.youtube.com/watch?v=b84Wzh-kH_s https://www.darpa.mil/attachments/TestimonyArchived(April%2020%201999).pdf
    • Grey Havoc
    • Thread
    • 2000s acoustic modem brown water captor darpa defense advanced research projects agency early 21st century green water late 1990s late 20th century littoral operations sub brief united states navy
    • Replies: 2
    • Forum: Secret Naval Projects
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