An acoustic array, integrated with an algorithm to discriminate potential Launch (LA) or
Impact (IM) events, was augmented by employing the Launch Impact Discrimination
(LID) algorithm for mortar events. We develop an added situational awareness capability
to determine whether the localized event is a mortar launch or mortar impact at safe
standoff distances. The algorithm utilizes a discrete wavelet transform to exploit higher
harmonic components of various sub bands of the acoustic signature. Additional features
are extracted via the frequency domain exploiting harmonic components generated by the
nature of event, i.e. supersonic shrapnel components at impact. The further extrapolations of these features are employed with a neural network to provide a high level of confidence for discrimination and classification. The ability to discriminate between these events is of great interest on the battlefield. Providing more information and developing a common picture of situational awareness. Algorithms exploit the acoustic sensor array to provide detection and identification of IM/LA events at extended ranges. The integration of this algorithm with the acoustic sensor array for mortar detection provides an early warning detection system giving greater battlefield information for field commanders. This paper will describe the integration of the algorithm with a candidate sensor and resulting field tests.
NATO's Task Group (TG-25) on acoustic and seismic sensing is responsible for assessing the potential technologies that can be cooperatively developed and shared within NATO's countries to provide effective, robust and low-cost battlefield sensor systems. The primary applications will be detection and/or classification of ground troops, ground vehicles, airborne vehicles, artillery and sniper. TG-25 has 3 main objectives: (1) to establish acoustic and seismic standards and data exchange procedures, (2) to compare, analyze, exchange, and develop analytical techniques, computational models and signal processing algorithms, and (3) to plan and conduct joint field experiments.
In this paper, we discuss participation in the joint NATO field experiment conducted in France in October 2002. The experiment's goal is to demonstrate interoperability of unattended ground sensors from various participating nations. Results of the experiments will be briefed and discussed.
Keywords: TG-25, unattended ground sensor, vehicle tracking
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