| Presentation | 2015-10-09 Study about multi-channelization in ultrasonic distance measurement using LFM signal coded by M-sequence Kota Yamanaka, Shinnosuke Hirata, Hiroyuki Hachiya, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In ultrasonic distance measurement by the pulse-echo method, the signal-to-noise ratio (S/N) of the received echo and the resolution of the time of flight (TOF) are improved by employment of pulse compression. In this research, pulse compression using a maximum-length sequence (M-sequence), which is one of the pseudo-random sequences, has been studied. An M-sequence is a sequential binary code which is generated from a linear feedback shift register (LFSR). In pulse compression using an M-sequence, the amplitude or phase of the transmitted signal is modulated by the M-sequence code. Then, the received signal is correlated with the M-sequence code. Furthermore, multi-channel concurrent measurement is enabled using transmitted signals which are coded by different M-sequences from different LFSRs. In the case of a lower-order M-sequence, however, the number of measurement channel, which is the kind of LFSR, is not enough. In this report, the method of coding of linear-frequency-modulated (LFM) signals, which is one of the frequency-sweep modulated signals, is discribed. The number of M-sequence codes which are taken from the M-sequence is sequence length. In case LFM signals are coded by these M-sequence codes, the coded signals can be used as different transmitted signals. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | multi-channel concurrent measurement / pulse compression / M-sequence / LFM signal |
| Paper # | US2015-60 |
| Date of Issue | 2015-10-02 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2015/10/9(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kanazawa Institute of Technology |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | General |
| Chair | Yoichi Itoh(Nihon Univ.) |
| Vice Chair | Mami Matsukawa(Doshisha Univ.) / Nobuyuki Endoh(Kanagawa Univ.) |
| Secretary | Mami Matsukawa(Univ. of Electro-Comm.) / Nobuyuki Endoh(Univ. of Electro-Comm.) |
| Assistant | Hideyuki Hasegawa(Univ. of Toyama) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study about multi-channelization in ultrasonic distance measurement using LFM signal coded by M-sequence |
| Sub Title (in English) | |
| Keyword(1) | multi-channel concurrent measurement |
| Keyword(2) | pulse compression |
| Keyword(3) | M-sequence |
| Keyword(4) | LFM signal |
| 1st Author's Name | Kota Yamanaka |
| 1st Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 2nd Author's Name | Shinnosuke Hirata |
| 2nd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 3rd Author's Name | Hiroyuki Hachiya |
| 3rd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| Date | 2015-10-09 |
| Paper # | US2015-60 |
| Volume (vol) | vol.115 |
| Number (no) | US-246 |
| Page | pp.pp.13-18(US), |
| #Pages | 6 |
| Date of Issue | 2015-10-02 (US) |