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Title
Japanese:1 ビット信号処理による相互相関処理を用いた超音波距離計測実験 
English:Experiments of ultrasonic distance measurement using cross-correlation 
Author
Japanese: 平田慎之介, 黒澤実, 片桐崇.  
English: Shinnosuke Hirata, Minoru Kuribayashi Kurosawa, Takashi Katagiri.  
Language Japanese 
Journal/Book name
Japanese:信学技報 
English: 
Volume, Number, Page Vol. 107    No. 494    pp. 49-54
Published date Feb. 2008 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract Ultrasonic distance measurement with the pulse-echo method is based upon the determination of the time of flight of ultrasonic waves. The pulse-compression technique, which involves the calculation of the cross–correlation function between the transmitted and the reflected waves, is the conventional method for improving the resolution of the measurement. The calculation of a cross-correlation operation requires high-cost digital signal processing, however. A new sensor signal processing method of the pulse-compression technique using a delta-sigma modulated single-bit digital signal has been proposed. The proposed method consists of a cross-correlation operation by single-bit signal processing, and a smoothing operation accomplished by a moving average filter. For the pulse-compression technique, this method reduces the calculation cost of digital signal processing. In this paper, cross-correlation by single-bit signal processing has been evaluated by experiment of ultrasonic distance measurement.

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