Abstract
This paper raises the design of an ultrasonic array for obstacle detection based on Phased Array (PA) techniques, which steers the acoustic beam through the environment by electronics rather than mechanical means. The transmission of every element in the array has been encoded, according to Code Division for Multiple Access (CDMA), which allows multiple beams to be transmitted simultaneously. All these features together enable a parallel scanning system which does not only improve the image rate but also achieves longer inspection distances in comparison with conventional PA techniques.
Highlights
In comparison with ordinary ultrasonic single-element transducers, Phased Arrays (PA) transducers provide a beam steering method without manual or mechanical scanner requirements
In this case an environment of Se = 64o is divided into K = 32 angular sectors, implying a maximum lateral resolution RL = SKe = 2o
In order to show the benefits of the proposed system, a comparison with conventional PA has been carried out
Summary
In comparison with ordinary ultrasonic single-element transducers, Phased Arrays (PA) transducers provide a beam steering method without manual or mechanical scanner requirements. If the number of sectors is higher than the number of array elements, the image rate of SA systems increases. The novel proposal of this work lies in simultaneously steering the beam at different azimuthal angles by emitting different Kasami codes at the same time, one for each image line or sector into which the scanned environment is divided.
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