Acoustic Module for Direction Finding of Small Aircraft

Acoustic correlated sources direction finding in the presence of unknown spatial correlation noise

In this paper, a new method is proposed for DOA estimation of correlated acoustic signals, in the presence of unknown spatial correlation noise. By generating a matrix from the signal subspace with the Hankel-SVD method, the correlated resource information is extracted from each eigen-vector. Then a joint-diagonalization  structure is constructed of the signal subspace and basis it, independent...

Bio-Inspired Miniature Direction Finding Acoustic Sensor

A narrowband MEMS direction finding sensor has been developed based on the mechanically coupled ears of the Ormia Ochracea fly. The sensor consists of two wings coupled at the middle and attached to a substrate using two legs. The sensor operates at its bending resonance frequency and has cosine directional characteristics similar to that of a pressure gradient microphone. Thus, the directional...

Direction Finding Using Multiple Mems Acoustic Sensors

Accurate Indoor Localization Using Acoustic Direction Finding via Smart Phones

We propose and implement a novel indoor localization scheme, Swadloon, built upon an accurate acoustic direction finding. Swadloon leverages sensors of the smartphone without the requirement of any specialized devices. The scheme Swadloon does not rely on any fingerprints and is very easy to use: a user only needs to shake the phone for a short duration before walking and localization. Our Swad...

Acoustic Detection and Tracking of Small, Low-flying Threat Aircraft

Acoustic sensor arrays can be used effectively to provide situational awareness and perimeter defense against small low-flying threat aircraft. Being small and flying low, these aircraft can elude radar detection. However, similar to heavy ground vehicles, these small aircraft emit strong harmonic lines that can be detected and tracked (bearing) at long range. Experimental results from a 16-ele...