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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(4):1031-1037; doi:10.1093/ietfec/e91-a.4.1031
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Selected Papers from the 20th Workshop on Circuits and Systems in Karuizawa -- Papers

Cross-Correlation by Single-bit Signal Processing for Ultrasonic Distance Measurement

Shinnosuke HIRATA1, Minoru Kuribayashi KUROSAWA1 and Takashi KATAGIRI2

1 The authors are with the Department of Information Processing, Tokyo Institute of Technology, Yokohama-shi, 226-8502 Japan. E-mail: hirata.s.ab{at}m.titech.ac.jp, 2 The author is with the Sutekina Inc., Komagane-shi, 399-4117 Japan.


  Abstract

Ultrasonic distance measurement using the pulse-echo method is based on the determination of the time of flight of ultrasonic waves. The pulse-compression technique, in which the cross-correlation function of a detected ultrasonic wave and a transmitted ultrasonic wave is obtained, is the conventional method used for improving the resolution of distance measurement. However, the calculation of a cross-correlation operation requires high-cost digital signal processing. This paper presents a new method of sensor signal processing within the pulse-compression technique using a delta-sigma modulated single-bit digital signal. The proposed sensor signal processing method consists of a cross-correlation operation employing single-bit signal processing and a smoothing operation involving a moving average filter. The proposed method reduces the calculation cost of the digital signal processing of the pulse-compression technique.

Key Words: ultrasonic distance measurement, pulse-compression technique, delta-sigma modulation, cross-correlation, moving average filter

Manuscript received July 2, 2007. Manuscript revised October 12, 2007.


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