5Yao Zhenjing, Meng Qinghao, Li Genwang. Non - Crosstalk Real -Time Ultrasonic Range System with Opti- mized Chaotic Pulse Position - Width Modulation Excita- tion : IUS 2008 : Ultrasonics Symposium, 2008, Beijing, Nov. 2 - 5, 2008 [ C ]. Washington: IEEE International Conference on, 2008.
6Hirata S, M K Kurosawa, T Katagiri. Real - time ultra- sonic distance measurements for autonomous mobile robots using cross correlation by single - bit signal processing: ICRA 09: Robotics and Automation, 2009, Kobe, May 12 - 17, 2009 [ C ]. Washington ~ IEEE International Con- ference on, 2009.
7Grennberg A, M Sandell. Estimation of subsample time de- lay differences in narrowband ultrasonic echoes using the Hilbert transform correlation [ J ]. Ultrasonics, Ferroelec- tries and Frequency Control IEEE Transactions on, 1994, 41(5) :588 -595.
8Marioli D, Narduzzi C, Offelli C, et al. Digital time - of - flight measurement for ultrasonic sensors [ J]. Instrumenta- tion and Measurement IEEE Transactions on, 1992,41 (1) :93 -97.
