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LFFM: The Low-frequency Facility Modeler
Atmospheric Infrasound Modeling
Infrasound
Infrasound (low-frequency atmospheric sound below 20 Hz) can be exploited to detect, localize, and characterize industrial activity, underground facilities and explosive testing.  Infrasound is an attractive sensor modality, primarily due to its potential for long standoff ranges.  It can be used to monitor sources of interest such as nuclear explosions, underground facilities, and industrial activity. The challenges in advancing infrasonic capabilities beyond the current state-of-the-art fall into three areas: sensor technology, wind mitigation, and signal interpretation. 



Natural sources of infrasound include: bolides (Meteors), volcanoes, severe storms, earthquakes, hurricanes, tsunamis, microbarams (ocean wave interaction), and surf.  Anthropogenic (related to human activity) sources include: nuclear weapons, conventional explosions, ground-based vehicles, rockets, machinery, power plants, mining activity, and supersonic aircraft.

    

APS has expertise in each of these three key infrasound technology areas.  We have on staff subject matter experts that have supported various programs for near, mid, and long-range infrasound monitoring applications.   Our core competencies include:
      Environmental characterization and interpretation
      High-resolution propagation modeling
      Sound-structure interaction modeling
      Real-time, user-friendly software tools and systems



Two examples of APS infrasonic-focused activities are given here:
      LFFM: The Low-frequency Facility Modeler
      Atmospheric Infrasound Modeling

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