An acoustic ground sensor system for detection and classification of military vehicles is currently being developed at the Norwegian Defence Research Establishment (NDRE). The system consists of a number of autonomous microphone units classifying the received sound in real time. Each unit is battery operated and transmits messages about detected vehicles via radio to a central controller. The sensor units incorporate a commercial digital signal processor (DSP) for internal signal analysis, while only high-level information is transferred to the central unit.
This paper presents the software and hardware realization of the system.