Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 4077-4086 |
| Number of pages | 10 |
| Journal | Journal of the Acoustical Society of America |
| Volume | 133 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jun 2013 |
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Keywords
- acoustic signal processing
- array signal processing
- direction-of-arrival estimation
- echo
- filtering theory
- target tracking
- ultrasonic absorption
- underwater sound
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A beam based method for target localization : inspiration from bats' directivity and binaural reception for ultrasonic sonar . / Guarato, Francesco; Windmill, James; Gachagan, Anthony.
In: Journal of the Acoustical Society of America, Vol. 133, No. 6, 06.2013, p. 4077-4086.Research output: Contribution to journal › Article
TY - JOUR
T1 - A beam based method for target localization
T2 - inspiration from bats' directivity and binaural reception for ultrasonic sonar
AU - Guarato, Francesco
AU - Windmill, James
AU - Gachagan, Anthony
PY - 2013/6
Y1 - 2013/6
N2 - The process of echolocation is accomplished by bats partly using the beam profiles associated with their ear shapes that allow for discrimination between different echo directions. Indeed, knowledge of the emitted signal characteristic and measurement of the echo travel time from a target make it possible to compensate for attenuation due to distance, and to focus on filtering through the receivers' beam profiles by comparing received echoes to the original signal at all frequencies in the spectrum of interest. From this basis, a beam profile method to localize a target in three-dimensional space for an ultrasonic sensor system equipped with an emitter and two receivers is presented. Simulations were conducted with different noise levels, and only the contribution of the receivers' beam profiles was considered to estimate the orientation of the target with respect to the receivers. The beam pattern of the Phyllostomus discolor's ear was adopted as that of a receiver. Analyses of beam resolution and frequency ranges were conducted to enhance the accuracy of orientation estimates. The choice of appropriate resolution and frequency ranges guarantee that error mean values for most of the orientations are within [0.5°, 1.5°], even in noisy situations: Signal-to-noise ratio values considered in this work are 35 and 50 dB.
AB - The process of echolocation is accomplished by bats partly using the beam profiles associated with their ear shapes that allow for discrimination between different echo directions. Indeed, knowledge of the emitted signal characteristic and measurement of the echo travel time from a target make it possible to compensate for attenuation due to distance, and to focus on filtering through the receivers' beam profiles by comparing received echoes to the original signal at all frequencies in the spectrum of interest. From this basis, a beam profile method to localize a target in three-dimensional space for an ultrasonic sensor system equipped with an emitter and two receivers is presented. Simulations were conducted with different noise levels, and only the contribution of the receivers' beam profiles was considered to estimate the orientation of the target with respect to the receivers. The beam pattern of the Phyllostomus discolor's ear was adopted as that of a receiver. Analyses of beam resolution and frequency ranges were conducted to enhance the accuracy of orientation estimates. The choice of appropriate resolution and frequency ranges guarantee that error mean values for most of the orientations are within [0.5°, 1.5°], even in noisy situations: Signal-to-noise ratio values considered in this work are 35 and 50 dB.
KW - acoustic signal processing
KW - array signal processing
KW - direction-of-arrival estimation
KW - echo
KW - filtering theory
KW - target tracking
KW - ultrasonic absorption
KW - underwater sound
UR - http://www.scopus.com/inward/record.url?scp=84878911337&partnerID=8YFLogxK
U2 - 10.1121/1.4802829
DO - 10.1121/1.4802829
M3 - Article
VL - 133
SP - 4077
EP - 4086
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
SN - 0001-4966
IS - 6
ER -