Accession Number:



Design and Development of Persistent Harmonic Acoustic Detector (PHAD) Sensor System

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

CCDC Army Research Laboratory

Report Date:


Pagination or Media Count:



Detection and characterization of multiple near-ground, slow-moving high-value targets is a critical need for the Department of Defense DOD. The detection and tracking of such targets, using sparse networks and in mixed urban and rural environments, can be carried out using acoustic sensing over a wide range of frequencies. In Persistent Harmonic Acoustic Detection PHAD, the US Army Combat Capabilities Development Command CCDC Army Research Laboratory developed a novel acoustic sensor system with capabilities and performance that mirror the larger footprint of low-frequency acoustic systems that are in the current military inventory while providing the form factor and ease of use for field installation by one Soldier. The Army can use this system to address unattended acoustic sensor needs for numerous applications ranging from activity detection to ground- and air-traffic monitoring to battlespace situational awareness, among others. Given the high sample rate available for PHAD, we can also connect multi-component seismic, electric-field, andor magnetic-field sensors and collect data contemporaneously with the aforementioned eight-channel acoustic array, making PHAD a deployable multimodal sensor. The PHAD is composed of two independently operable, but slightly different, acoustic arrays, the small array SA and the large array LA. The SA is easier to deploy while the LA is expected to have a better performance in monitoring low frequency targets at standoff. For both arrays, the CCDC Army Research Laboratory packages the electronics inside the environmentally hardened sensor box. The range of DOD targets capable of being detected, tracked, and located using the PHAD system continues to grow, showing the systems efficacy as a multi-role acoustic detection system.


Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

[A, Approved For Public Release]