Accuracy and resolution of ultrasonic distance measurement with high-time-resolution cross-correlation function obtained by single-bit signal processing

Acoustical Science and Technology

Takashi Katagiri¹  Shinnosuke Hirata²  Minoru Kuribayashi Kurosawa² 

[1] Sutekina Inc.;Department of Information Processing, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

关键词: Ultrasonic distance measurement;    Cross correlation;    Single-bit signal processing;    Delta-sigma modulation;   

DOI  :  10.1250/ast.30.429

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

References(10)Cited-By(13)Distance measurement using an ultrasonic wave is suitable for environment recognition in autonomous mobile robots. Ultrasonic distance measurement with the pulse-echo method is based on the determination of the reflected echo’s time of flight (TOF). Pulse compression can improve distance resolution and the reflected echo’s signal-to-noise ratio (SNR). However, calculation of cross correlation requires high-cost digital signal processing. A sensor signal processing method of cross correlation using a delta-sigma modulated single-bit digital signal has been proposed. Cross correlation by single-bit signal processing reduces the calculation costs of cross correlation. Furthermore, cross correlation by single-bit signal processing improves the time resolution of the cross-correlation function. Therefore, the high-time-resolution cross-correlation function improves the distance resolution of the cross-correlation method. In this paper, ultrasonic distance measurement using cross correlation by single-bit signal processing is evaluated based on computer simulations and the experimental results.

【 授权许可】

Unknown