Direction finding system using MEMS sound sensors
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Provided is a Direction Finding Acoustic Sensor comprising a first sound sensor and a second sound sensor, where the first and second sensors are generally maintained in a reflectional symmetry around an axis of symmetry. A digital device in data communication both sound sensors receives a signal from P(L) from the first sensor a signal P(R) from the second sensor based on displacement respective sensors. The digital device evaluates a difference between an α(1)P(L) and the α(2)P(R) relative to a sum of the α(1)P(L) and the α(2)P(R), and provides an angle Θ(s), corresponding to the result. Typically, the Direction Finding Acoustic Sensor communicates the Θ(s) determined using some appropriate reference frame, such as the axis of symmetry. The Direction Finding Acoustic Sensor is capable of providing an unambiguous direction within an angle of ±(90˚- Θ(off)) of the axis of symmetry.
Patent No. US 9,843,858 B1
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Wilmott, Daniel; Alves, Fabio; Karunasiri, Gamani (2016-07-21);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 ...
Wilmott, Daniel (Monterey, California: Naval Postgraduate School, 2015-09);A microelectromechanical direction-finding sensor has been developed based on the mechanically coupled ears of the Ormia ochracea fly. Previous designs determined the direction of sound relative to the normal of the sensor ...
Harrison, Stephen C. W. (Monterey, California. Naval Postgraduate School, 2009-12);Several articles have been written on Micro Electro Mechanical System (MEMS) based microphones including directional sound sensors, mimicking the hearing of the fly, Ormia Ochracea. Determining the operating characteristics ...