Unequal Directivity Orders Between Two Figure-8 Sensors Perpendicularly Colocated with a Pressure Sensor – Their “Spatial Matched Filter” Beam Steering

• Unequal “directivity orders” between two figure8 directional microphones/hydrophones are proposed and analyzed in this paper for beamforming. Specifically, two figure 8 sensors here, possibly of different “directivity orders”, are (i) orthogonally oriented to facilitate spatial filtering in both the azimuth and the elevation, and (ii) spatially colocated with an isotropic sensor (thereby decoupling the incident source's azimuth-elevation-radial dimensions from the impinging signal's time-frequency dimensions). This versatility (in the sensors’ diverse “directivity orders”) contrasts with all prior open literature on beamforming using a colocated triad of possibly directional sensors. Instead, this paper analytically explores how unequal directivity orders between two perpendicularly colocated figure-8 acoustic sensors would affect the triad array's “spatial matched filter” beam steering. The resulting “actionable” insights show which directivity-order combinations allow the beam of full maneuverability toward any azimuthal direction, and which directivity-order combinations only partial maneuverability.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

Acoustic arrays

acoustic beam focusing

acoustic beam steering

acoustic beams

acoustic signal processing

array signal processing

Beam steering

beamforming

beams

dipole arrays

directional sensors

focusing

Manifolds

multisensor systems

Sensor arrays

Sensors

sonar arrays

underwater acoustic arrays

underwater acoustic transducers

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)