Handbook on Array Processing and Sensor Networks
Handbook on Array Processing and Sensor Networks
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Most of the ultrasonic distance measurements are based on the determination of the Time of flight. Digital signal processing techniques for obtaining high accuracy in ultrasonic distance measurements are presented in this paper. The proposed method employs a Wavelet transform to extract the envelope of the reflected pulse echo, together with a cross-correlation pulse detection algorithm for the Time of flight estimation. The simulated system consists of five elements transducer array as both transmitter and receiver. The transducer array is formed by aligning the transducers with minimum spacing between elements of 2 wavelengths. The results show the accuracy with the theoretical value. The simulation for the above said module has been implemented using LabVIEW (Laboratory virtual instrument engineering workbench) developed by National Instrument, is a graphical programming environment suited for high-level and system level design.