Prof. Motoyuki Sato Profile

Prof. Motoyuki Sato

Professor at Tohoku Univ

SPIE Involvement:

Author

Publications (40)

Proceedings Article | 21 June 2019 Presentation + Paper

Passive radar for measuring passive sensors: direct signal interference suppression on FPGA using orthogonal matching pursuit and stochastic gradient descent

Jean-Michel Friedt, Weike Feng, Motoyuki Sato, Stéphane Chrétien, Gwenhael Goavec-Merou

Proceedings Volume 11059, 1105906 (2019) https://doi.org/10.1117/12.2525953

KEYWORDS: Surveillance, Sensors, Radar, Field programmable gate arrays, Stochastic processes, Signal detection, Acoustics, Receivers, Signal processing, Passive sensors

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Passive wireless sensors provide an attractive technology in niche applications where battery powered sensors are not applicable. Surface acoustic wave technology provides an optimum implementation of passive wireless transducers acting as cooperative targets to short range radar systems: the signal carrying the information is delayed beyond clutter, with a piezoelectric substrate converting the electromagnetic wave to an acoustic wave whose properties are dependent on the environment. We have tackled the issue of short range radar certification by considering a passive radar approach in which existing non-cooperative radiofrequency sources are used to power the sensor, and the reader is made solely of passive receivers aimed at recording the reference signal generated by the non-cooperative source and the backscattered signal returned by the sensor. A passive radar approach only requires a cross-correlation between the reference and surveillance signals to identify the time delay between the incoming and backscattered signals and hence the recovery of the physical quantity sensed by the acoustic transducer through acoustic velocity modulation. Practical sources do exhibit some short term correlation. Hence, strong copies of the reference signal with delays shorter than the one introduced by the sensor must be canceled by the receiver to allow for the weak sensor response to be extracted. This classical problem is called Direct Signal Interference (DSI) suppression. In a post-processing approach with little computation time limitation, this problem is solved using a least square error optimization approach. In the context of real time sensor measurement using a Field Programmable Gate Array (FPGA) implementation, data recording, frequency transposition and decimation are readily implemented in the gate array matrix. DSI removal appears as the limiting factor for a full FPGA implementation of the short range passive radar reader. We address the challenge by the iterative process of DSI suppression using Orthogonal Matching Pursuit (OMP) algorithm, and additionnally consider the FPGAfriendly Stochastic Gradient Descent (SGD) approach to try to recover DSI coefficients from a pipelined algorithm using streams of measurement data.

Proceedings Article | 10 May 2019 Presentation + Paper

Dual sensor ALIS evaluation test in Cambodia

Motoyuki Sato

Proceedings Volume 11012, 1101216 (2019) https://doi.org/10.1117/12.2518379

KEYWORDS: Alternate lighting of surfaces, Electromagnetic coupling, General packet radio service, Mining, Metals, Head

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Proceedings Article | 30 April 2018 Presentation + Paper

UXO clearance operation in Laos

Motoyuki Sato, Yoshihiko Kadoya

Proceedings Volume 10628, 106280J (2018) https://doi.org/10.1117/12.2303967

KEYWORDS: Sensors, Metals, Agriculture, Mining, Land mines, Target detection, Roads, Unexploded object detection, Weapons, Calibration

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Proceedings Article | 30 April 2018 Paper

Introduction of the advanced ALIS: Advanced Landmine Imaging System

Motoyuki Sato

Proceedings Volume 10628, 106280V (2018) https://doi.org/10.1117/12.2303966

KEYWORDS: Sensors, Mining, Land mines, Electromagnetic coupling, Prototyping, Metals, Signal processing, Synthetic aperture radar

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Proceedings Article | 3 May 2017 Presentation + Paper

Dual sensor technology of landmine clearance and its applications to survey in natural disaster

Motoyuki Sato

Proceedings Volume 10182, 101820Y (2017) https://doi.org/10.1117/12.2262036

KEYWORDS: Sensors, Metals, General packet radio service, Antennas, Mining, Alternate lighting of surfaces, Data acquisition, Earthquakes, Natural disasters, Synthetic aperture radar

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Proceedings Article | 7 June 2013 Paper

Deployment of dual-sensor ALIS for humanitarian demining in Cambodia

M. Sato, K. Takahashi

Proceedings Volume 8709, 87090M (2013) https://doi.org/10.1117/12.2015508

KEYWORDS: Alternate lighting of surfaces, Sensors, Land mines, General packet radio service, Metals, Mining, Explosives, Image processing, Radar, Signal processing

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Proceedings Article | 11 May 2012 Paper

ALIS deployment in Cambodia

Kazunori Takahashi, Motoyuki Sato

Proceedings Volume 8357, 83571A (2012) https://doi.org/10.1117/12.918516

KEYWORDS: Alternate lighting of surfaces, Sensors, Mining, Land mines, General packet radio service, Metals, Image processing, Electromagnetic coupling, Antennas, Radar

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Proceedings Article | 11 May 2012 Open Access

Landmine detection by 3D GPR system

Kazunori Takahashi, Yuya Yokota, Motoyuki Sato, Mark Grasmueck

Proceedings Volume 8357, 835710 (2012) https://doi.org/10.1117/12.918517

KEYWORDS: General packet radio service, Data acquisition, Land mines, Mining, Alternate lighting of surfaces, Sensors, Antennas, Spatial resolution, Robotics, Image processing

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Proceedings Article | 29 April 2010 Paper

Evaluation test of ALIS in Cambodia for humanitarian demining

Motoyuki Sato

Proceedings Volume 7664, 76641P (2010) https://doi.org/10.1117/12.849393

KEYWORDS: Sensors, Alternate lighting of surfaces, General packet radio service, Metals, Mining, Data acquisition, Image sensors, Antennas, Land mines, CCD image sensors

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Proceedings Article | 5 May 2009 Paper

ALIS evaluation tests in Croatia

Jun Fujiwara, Kazunori Takahashi, Takashi Kido, Motoyuki Sato

Proceedings Volume 7303, 73031B (2009) https://doi.org/10.1117/12.818497

KEYWORDS: Alternate lighting of surfaces, Sensors, Metals, General packet radio service, Mining, Land mines, Image sensors, Data acquisition, Antennas, Signal detection

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Proceedings Article | 29 April 2008 Paper

Hand-held dual-sensor ALIS and its evaluation tests

Motoyuki Sato, Kazunori Takahashi

Proceedings Volume 6953, 695311 (2008) https://doi.org/10.1117/12.777236

KEYWORDS: Alternate lighting of surfaces, Sensors, General packet radio service, Metals, Land mines, Image sensors, Data acquisition, Signal detection, Antennas, Visualization

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Proceedings Article | 26 April 2007 Paper

The evaluation test of hand-held dual-sensor ALIS in Croatia and Cambodia

Motoyuki Sato, Kazunori Takahashi

Proceedings Volume 6553, 65531D (2007) https://doi.org/10.1117/12.718901

KEYWORDS: Sensors, Alternate lighting of surfaces, Metals, Land mines, Mining, General packet radio service, Vegetation, Signal detection, Data acquisition, Image quality

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Proceedings Article | 26 April 2007 Paper

The development of the hand-held dual-sensor ALIS

Motoyuki Sato, Kazunori Takahashi, Jun Fujiwara

Proceedings Volume 6553, 65531C (2007) https://doi.org/10.1117/12.718900

KEYWORDS: Alternate lighting of surfaces, Sensors, General packet radio service, Metals, Land mines, Signal detection, Antennas, Visualization, Image sensors, Data acquisition

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Proceedings Article | 18 May 2006 Paper

Migration and interpolation for the hand-held GPR MD sensor system (ALIS)

Kazunori Takahashi, Motoyuki Sato, Takao Kobayashi, Xuan Feng, Jun Fujiwara

Proceedings Volume 6217, 62172M (2006) https://doi.org/10.1117/12.664750

KEYWORDS: General packet radio service, Sensors, Land mines, Alternate lighting of surfaces, Imaging systems, CCD image sensors, Metals, Image processing, Visualization, Antennas

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Proceedings Article | 18 May 2006 Paper

Development of handheld dual-sensor ALIS and its evaluation

Motoyuki Sato, Kazunori Takahashi, Takao Kobayashi, Jun Fujiwara, Xuan Feng

Proceedings Volume 6217, 62172L (2006) https://doi.org/10.1117/12.665402

KEYWORDS: Sensors, Alternate lighting of surfaces, Metals, General packet radio service, Land mines, Antennas, CCD image sensors, Signal detection, Data acquisition, Signal processing

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Proceedings Article | 18 May 2006 Paper

Vehicle-mounted SAR-GPR and its evaluation

Xuan Feng, Jun Fujiwara, Takao Kobayashi, Motoyuki Sato, Kazunori Takahashi

Proceedings Volume 6217, 62172H (2006) https://doi.org/10.1117/12.665416

KEYWORDS: Sensors, General packet radio service, Network security, Antennas, Land mines, Metals, Signal processing, Data acquisition, Image sensors, Calibration

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Proceedings Article | 18 May 2006 Paper

Migration trajectory and migration aperture of SAR-GPR in rough ground area

Xuan Feng, Motoyuki Sato, Takao Kobayashi

Proceedings Volume 6217, 621725 (2006) https://doi.org/10.1117/12.664744

KEYWORDS: Diffraction, 3D modeling, Antennas, Land mines, Synthetic aperture radar, Metals, General packet radio service, Chemical mechanical planarization, Data modeling, Signal processing

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