Title :
Cross-Correlation and Sine-Fitting Techniques for High-Resolution Ultrasonic Ranging
Author :
Queirós, Ricardo ; Alegria, Francisco Corrêa ; Girão, Pedro Silva ; Serra, António Cruz
Author_Institution :
Dept. of Electr. & Comput. Eng., Tech. Univ. of Lisbon, Lisbon, Portugal
Abstract :
This paper presents a combination of two techniques for high-resolution ultrasonic distance measurements in air. The first is the cross correlation between transmitted and received signals to determine the time of flight (TOF), and the second is sine fitting of other transmitted and received signals to determine the phase shift (PS) between them. Sine fitting can estimate the PS with very high accuracy. The result of this synergy is a very accurate distance measurement. For example, the final uncertainty is less than 100 for distances up to 1200 mm.
Keywords :
distance measurement; high resolution ultrasonic ranging; phase shift; sine fitting technique; time of flight; ultrasonic distance measurement; Bandwidth; Cameras; Distance measurement; Fitting; Lenses; Phase estimation; Phase measurement; Transmitters; Ultrasonic variables measurement; Wavelength measurement; Cross correlation; sine fitting; time of flight (TOF) and phase-shift (PS) estimation; ultrasonic ranging;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2010.2047305
