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Three-dimensional-positioning based on echolocation using a simple iterative method
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DOI：10.1016/j.aeue.2014.11.014.png)
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Abstract
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This paper describes a method for determining the position of an object in three dimensions using time-of-flight (TOF) echolocation. The position is computed using a one-bit cross correlation and requires less computation time than a general cross correlation. A delta-sigma modulation board is introduced to convert the echo signal into one-bit signals. This solution uses an iterative method, i.e., Newton-Raphson, to obtain a position estimate. Additionally, an initial value for the solution is obtained by averaging TOFs, and no guess is required. Three hand-held communication devices are adapted as acoustical receivers. The validity of the proposed method is verified by the repeatability of the experimental results. (C) 2014 Elsevier GmbH. All rights reserved.
Keywords:
Echolocation
Linear-period-modulated signal
One-bit signal processing
Three-dimensional ultrasonic system
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