The Experts below are selected from a list of 6345 Experts worldwide ranked by ideXlab platform

Makoto Kaneko - One of the best experts on this subject based on the ideXlab platform.

  • Self-excited Dynamic Active Antenna
    Advanced Robotics, 2012
    Co-Authors: Naohiro Ueno, Makoto Kaneko
    Abstract:

    This paper proposes the Self-excited Dynamic Active Antenna (SDAA) that can detect a contact location between an insensitive flexible beam and an object through observation of the fundamental frequ...

  • ICRA - Contact localization by multiple Active Antenna
    Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999
    Co-Authors: N. Ueno, Makoto Kaneko
    Abstract:

    Discusses the multiple Active Antenna that is simply composed of two insensitive flexible beams placed in the rotational plane, one actuator, one position sensor and one axis moment sensor. The sensor system can detect the contact point between the beams and an object through a simple rotating motion even for the object placed with an inclination angle. During rotating motion, one beam first makes contact with an object. By continuously applying the rotating motion, the second beam makes contact with the same point of the object. Each contact angle is estimated by utilizing both the moment and position sensors. Finally, the contact point can be estimated by the geometrical relationship. The basic idea is verified by experiments.

  • Active Antenna for contact sensing
    International Conference on Robotics and Automation, 1998
    Co-Authors: Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    This paper proposes a new Active sensor system (Active Antenna) that can detect not only the contact location between an insensitive flexible beam and an environment but also the information of the environment's surface where the beam makes contact. The Active Antenna is simply composed of a flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. We first show that the contact distance under no lateral slip is proportional to the rotational compliance that the beam can sense at the rotational center. The lateral slip, which possibly occurs according to the pushing direction and the environment's geometry, overestimates the rotational compliance, and as a result, brings a large sensing error for the localizing contact point. The goal of this paper is to find the contact location under such conditions. We explore how to detect a lateral slip and how to determine the new pushing direction to avoid it. We show an algorithm that can search for the pushing direction which can avoid any lateral slip. The convergence of this algorithm is shown and a practical utilization of this algorithm is also discussed with a trade-off between the number of trials and the sensing accuracy.

  • ICRA - On 3D vision based Active Antenna
    Proceedings of International Conference on Robotics and Automation, 1997
    Co-Authors: Naoki Kanayama, Makoto Kaneko, Toshio Tsuji
    Abstract:

    This paper discusses the 3D vision based Active Antenna (3D-VBAA) that can detect the contact force and the contact point between an insensitive elastic Antenna and a 3D environment. The 3D-VBAA is composed of an insensitive flexible Antenna, two actuators, two position sensors, a camera, and a one-axis moment sensor. By utilizing the Antenna's shape mapped into the calibration, plane C, the vision sensor can provide both the contact distance and a force component on C. The moment sensor output allows us to evaluate the force component normal to C. The 3D-VBAA can work even under a compliant object, while the 3D Active Antenna cannot. We show that the coupling effect between vision and moment sensor depends on the implementation angle of the CCD camera. We verify our idea experimentally.

  • Artificial Active Antenna
    Journal of the Robotics Society of Japan, 1997
    Co-Authors: Yutaka Hino, Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    The Artificial Active Antenna is the sensor system motivated by the insect's Antenna. It can detect the location between an insensitive flexible beam and an object through measurement of the rotational compliance on the beam in contact with the object. The goal of this paper is to consider the effects of the environment curvature on the sensing accuracy. We first introduce a set of basic equations representing force-deformation and geometrical relationships. Both numerical and approximate solutions are shown with experimental results. We show that the effect of the environment curvature on the sensing accuracy can be discussed by usung one non-dimensional parameter consisting of the pushing angle, the contact distance, and the radius of curvature of the object. Finally, we show that the environment curvature makes little influence on the sensing accuracy.

Toshio Tsuji - One of the best experts on this subject based on the ideXlab platform.

  • Active Antenna for contact sensing
    International Conference on Robotics and Automation, 1998
    Co-Authors: Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    This paper proposes a new Active sensor system (Active Antenna) that can detect not only the contact location between an insensitive flexible beam and an environment but also the information of the environment's surface where the beam makes contact. The Active Antenna is simply composed of a flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. We first show that the contact distance under no lateral slip is proportional to the rotational compliance that the beam can sense at the rotational center. The lateral slip, which possibly occurs according to the pushing direction and the environment's geometry, overestimates the rotational compliance, and as a result, brings a large sensing error for the localizing contact point. The goal of this paper is to find the contact location under such conditions. We explore how to detect a lateral slip and how to determine the new pushing direction to avoid it. We show an algorithm that can search for the pushing direction which can avoid any lateral slip. The convergence of this algorithm is shown and a practical utilization of this algorithm is also discussed with a trade-off between the number of trials and the sensing accuracy.

  • ICRA - On 3D vision based Active Antenna
    Proceedings of International Conference on Robotics and Automation, 1997
    Co-Authors: Naoki Kanayama, Makoto Kaneko, Toshio Tsuji
    Abstract:

    This paper discusses the 3D vision based Active Antenna (3D-VBAA) that can detect the contact force and the contact point between an insensitive elastic Antenna and a 3D environment. The 3D-VBAA is composed of an insensitive flexible Antenna, two actuators, two position sensors, a camera, and a one-axis moment sensor. By utilizing the Antenna's shape mapped into the calibration, plane C, the vision sensor can provide both the contact distance and a force component on C. The moment sensor output allows us to evaluate the force component normal to C. The 3D-VBAA can work even under a compliant object, while the 3D Active Antenna cannot. We show that the coupling effect between vision and moment sensor depends on the implementation angle of the CCD camera. We verify our idea experimentally.

  • Artificial Active Antenna
    Journal of the Robotics Society of Japan, 1997
    Co-Authors: Yutaka Hino, Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    The Artificial Active Antenna is the sensor system motivated by the insect's Antenna. It can detect the location between an insensitive flexible beam and an object through measurement of the rotational compliance on the beam in contact with the object. The goal of this paper is to consider the effects of the environment curvature on the sensing accuracy. We first introduce a set of basic equations representing force-deformation and geometrical relationships. Both numerical and approximate solutions are shown with experimental results. We show that the effect of the environment curvature on the sensing accuracy can be discussed by usung one non-dimensional parameter consisting of the pushing angle, the contact distance, and the radius of curvature of the object. Finally, we show that the environment curvature makes little influence on the sensing accuracy.

  • A new sensing scheme for 3D Active Antenna
    1996 IEEE SICE RSJ International Conference on Multisensor Fusion and Integration for Intelligent Systems (Cat. No.96TH8242), 1996
    Co-Authors: Naoki Kanayama, Makoto Kaneko, Toshio Tsuji
    Abstract:

    This paper discusses a new sensing scheme for 3D Active Antenna that can detect not only the contact location between an insensitive flexible beam and an object but also the normal direction of the object's surface where the beam makes contact. The Active Antenna is simply composed of an insensitive flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. In our former work (Kaneko and Kanayama, 1995), we have shown that both the normal direction and the contact distance can be obtained by more than three times pushing motions. Through the mathematical formulation between the pushing geometry and the contact force, we newly find that both the normal direction and the contact distance can be determined by just one time pushing motion, even though a lateral slip between the beam and an object appears during the pushing motion. We further verify the working principle by experiments.

  • ICRA - Vision based Active Antenna
    Proceedings of IEEE International Conference on Robotics and Automation, 1996
    Co-Authors: Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    This paper proposes the vision based Active Antenna (VBAA) that can detect the contact force, the stiffness of the environment, and the contact location between an insensitive elastic Antenna and an environment, through the observation of the Antenna's shape by a camera. We show that both the contact location and the contact force can be estimated by measuring two arbitrary points on the Antenna after a pushing motion; even though the exact contact point is hidden by occlusion. By considering the geometrical relationship between. The virtual (without environment) and the real (with environment) displacements of the contact point, the stiffness of the environment can also be estimated, which our conventional Active Antenna can not do. We present the basic working principle of the VBAA and give experimental verification.

Serge N. Yerin - One of the best experts on this subject based on the ideXlab platform.

  • SNRs of two Active Antenna designs: Inverted V vs horizontal dipole
    2017 XI International Conference on Antenna Theory and Techniques (ICATT), 2017
    Co-Authors: Alexander A. Konovalenko, I.n. Bubnov, Peter L. Tokarsky, Serge N. Yerin
    Abstract:

    We present the results of numerical analysis of two design versions of Active Antenna which were considered for using in phased Antenna array of GURT radio telescope at the stage of preliminary design. Both Antenna versions are supplied with the same preamplifier but their dipole shapes differ. The first Active Antenna version has linear horizontal dipole, the second one - inverted V-dipole. The differences of input impedances, efficiencies, and mismatch coefficients of dipoles with preamplifier as well as the effect of these parameters on noise temperatures and SNR of Antennas are analyzed in detail.

  • Sensitivity of an Active Antenna Array Element for the Low-Frequency Radio Telescope GURT
    IEEE Transactions on Antennas and Propagation, 2017
    Co-Authors: Peter L. Tokarsky, Alexander A. Konovalenko, Serge N. Yerin
    Abstract:

    The recently developed new generation, low-frequency Giant Ukrainian Radio Telescope (GURT) is built nearby the well-known Ukrainian T-shaped Radio Telescope. The new facility employs a phased Antenna array composed of many subarrays of 5×5 Active Antenna elements. In this paper, the parameters of the Active Antenna used as array element are studied, with special attention paid to sensitivity. The electrical and noise parameters are calculated using computer simulation and wave techniques for noise modeling of two-port networks. The results of numerical calculations of the sensitivity are given in terms of the sky noise dominance (SND) and system equivalent flux density of the GURT element within 10-80 MHz. The calculated results are compared with in situ measurements.

Naoki Kanayama - One of the best experts on this subject based on the ideXlab platform.

  • Active Antenna for contact sensing
    International Conference on Robotics and Automation, 1998
    Co-Authors: Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    This paper proposes a new Active sensor system (Active Antenna) that can detect not only the contact location between an insensitive flexible beam and an environment but also the information of the environment's surface where the beam makes contact. The Active Antenna is simply composed of a flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. We first show that the contact distance under no lateral slip is proportional to the rotational compliance that the beam can sense at the rotational center. The lateral slip, which possibly occurs according to the pushing direction and the environment's geometry, overestimates the rotational compliance, and as a result, brings a large sensing error for the localizing contact point. The goal of this paper is to find the contact location under such conditions. We explore how to detect a lateral slip and how to determine the new pushing direction to avoid it. We show an algorithm that can search for the pushing direction which can avoid any lateral slip. The convergence of this algorithm is shown and a practical utilization of this algorithm is also discussed with a trade-off between the number of trials and the sensing accuracy.

  • ICRA - On 3D vision based Active Antenna
    Proceedings of International Conference on Robotics and Automation, 1997
    Co-Authors: Naoki Kanayama, Makoto Kaneko, Toshio Tsuji
    Abstract:

    This paper discusses the 3D vision based Active Antenna (3D-VBAA) that can detect the contact force and the contact point between an insensitive elastic Antenna and a 3D environment. The 3D-VBAA is composed of an insensitive flexible Antenna, two actuators, two position sensors, a camera, and a one-axis moment sensor. By utilizing the Antenna's shape mapped into the calibration, plane C, the vision sensor can provide both the contact distance and a force component on C. The moment sensor output allows us to evaluate the force component normal to C. The 3D-VBAA can work even under a compliant object, while the 3D Active Antenna cannot. We show that the coupling effect between vision and moment sensor depends on the implementation angle of the CCD camera. We verify our idea experimentally.

  • Artificial Active Antenna
    Journal of the Robotics Society of Japan, 1997
    Co-Authors: Yutaka Hino, Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    The Artificial Active Antenna is the sensor system motivated by the insect's Antenna. It can detect the location between an insensitive flexible beam and an object through measurement of the rotational compliance on the beam in contact with the object. The goal of this paper is to consider the effects of the environment curvature on the sensing accuracy. We first introduce a set of basic equations representing force-deformation and geometrical relationships. Both numerical and approximate solutions are shown with experimental results. We show that the effect of the environment curvature on the sensing accuracy can be discussed by usung one non-dimensional parameter consisting of the pushing angle, the contact distance, and the radius of curvature of the object. Finally, we show that the environment curvature makes little influence on the sensing accuracy.

  • A new sensing scheme for 3D Active Antenna
    1996 IEEE SICE RSJ International Conference on Multisensor Fusion and Integration for Intelligent Systems (Cat. No.96TH8242), 1996
    Co-Authors: Naoki Kanayama, Makoto Kaneko, Toshio Tsuji
    Abstract:

    This paper discusses a new sensing scheme for 3D Active Antenna that can detect not only the contact location between an insensitive flexible beam and an object but also the normal direction of the object's surface where the beam makes contact. The Active Antenna is simply composed of an insensitive flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. In our former work (Kaneko and Kanayama, 1995), we have shown that both the normal direction and the contact distance can be obtained by more than three times pushing motions. Through the mathematical formulation between the pushing geometry and the contact force, we newly find that both the normal direction and the contact distance can be determined by just one time pushing motion, even though a lateral slip between the beam and an object appears during the pushing motion. We further verify the working principle by experiments.

  • ICRA - Vision based Active Antenna
    Proceedings of IEEE International Conference on Robotics and Automation, 1996
    Co-Authors: Makoto Kaneko, Naoki Kanayama, Toshio Tsuji
    Abstract:

    This paper proposes the vision based Active Antenna (VBAA) that can detect the contact force, the stiffness of the environment, and the contact location between an insensitive elastic Antenna and an environment, through the observation of the Antenna's shape by a camera. We show that both the contact location and the contact force can be estimated by measuring two arbitrary points on the Antenna after a pushing motion; even though the exact contact point is hidden by occlusion. By considering the geometrical relationship between. The virtual (without environment) and the real (with environment) displacements of the contact point, the stiffness of the environment can also be estimated, which our conventional Active Antenna can not do. We present the basic working principle of the VBAA and give experimental verification.

V.f. Fusco - One of the best experts on this subject based on the ideXlab platform.

  • Active Antenna discriminator for frequency stabilisation
    Electronics Letters, 2000
    Co-Authors: V.f. Fusco
    Abstract:

    The authors show how an Active Antenna transmitter module can have its frequency stability improved using FM demodulation techniques. A closed loop feedback strategy is presented, in order to improve the bias pushing characteristic of the Active Antenna from 41 MHz/V to 5 MHz/V. A linearised feedback model for the system is also presented which predicts the frequency pushing characteristic to be 7 MHz/V.

  • HBT Active Antenna as a self-oscillating Doppler sensor
    IEE Proceedings - Microwaves Antennas and Propagation, 2000
    Co-Authors: M.j. Kelly, S. Sancheti, V.f. Fusco, J.a.c. Stewart, S. Drew
    Abstract:

    The use of a heterojunction bipolar transistor in an Active Antenna operating as a self-oscillating Doppler sensor is investigated. A large-signal model compatible with nonlinear-circuit-simulation CAD packages is developed and used to simulate the performance of the Active Antenna, including its phase-noise characteristics. The Active Antenna operates at 11.4 GHz with an EIRP of 11 dBm. As a self oscillating sensor, it exhibits a minimum detectable signal relative to carrier of –99 dBm in a 10 Hz bandwidth. This gives the sensor a usable range of approximately 40 m making it useful for a variety of intruder-detection and other short-range-sensing applications.

  • Automatic beam steered Active Antenna receiver
    1997 IEEE MTT-S International Microwave Symposium Digest, 1997
    Co-Authors: S. Gupta, V.f. Fusco
    Abstract:

    This paper describes the design and behaviour of a novel compact self-phased integrated mixer Active Antenna receive array. The array performs automatic beam steering at low IF frequencies by the use of a pilot carrier inserted in-channel with the information signal. The phasing considerations, advantages, properties and practical considerations of this type of array are outlined. An experimental array based on this technique has been constructed to verify the principles involved. Experimental results on self-mixing and self-phasing performance are included in order to illustrate the automatic beam steering capability of this type of array.

  • Eigenvalue mode confirmation in a mutually coupled Active Antenna chain array
    26th European Microwave Conference 1996, 1996
    Co-Authors: D.e.j. Humphrey, V.f. Fusco
    Abstract:

    Arrays of coupled Active Antenna oscillators can be used for power-combining at microwave and millimetre-wave frequencies. It is known that the relative phase angle between Active Antenna oscillators placed in an array and hence their far-field radiation pattern can have certain discrete values depending on the separation distance between elements. Thus in order to characterise an Active array an accurate method of evaluating the coupling between oscillators and a knowledge of the available modes that exist within the array are required. In this paper the available modes for an array of mutually coupled Active Antenna elements are evaluated by examination of the eigenvectors of the impedance matrix of the passive element components in the Active array. Time domain numerical simulations are performed and the resulting predictions compared to those obtained by experiment and by the eigenvalue approach.

  • Two element Active Antenna array mode stability
    IEEE MTT ED AP LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium, 1996
    Co-Authors: D.e.j. Humphrey, V.f. Fusco
    Abstract:

    It is known that when a passive Antenna array is arranged to enable quasi-optical power-combining, a single phase distribution or mode will exist between the individual elements. However, when Active Antenna arrays are considered the individual Active Antenna oscillators can exhibit a number of array modes. In this paper, closed form analytical equations for the stability condition for the two modes available within a two element collinear array as the element separation is increased are presented. This information enables the correct prediction of the output characteristics of the array which is important since the far-field radiation pattern depends on the stable mode (i.e. boresight null or peak).