The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Hiroshi Yasukawa - One of the best experts on this subject based on the ideXlab platform.
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ofdm receiver performance using Rotating circular array Antenna for vehicle communications
Vehicular Technology Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics degrade significantly due to time variation of the channel properties. One solution is to rotate a circular array Antenna so as to decrease the speed of receiving Antenna relative to the ground [1]. When the vehicle speed changes, the Rotating Antenna needs to keep the optimum rotation speed. To solve this problem, we proposed a control method of the Rotating Antenna [2]. This method employs two rotation Antennas whose rotation speeds are slightly different. The steepest descent method based on the MSE of the demodulation output before and after of the vehicle speed changes is adopted to update the rotation speed. Our goal is to propose an easily implementable system using a single Rotating Antenna. In this paper, we propose a new control method on the rotation speed with a single Rotating Antenna by applying the margin of MSE between two successive symbols. Simulation results show the effectiveness of the proposed method.
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rotation speed control method for ofdm receiver using Rotating circular array Antenna
Wireless Communications and Networking Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotation speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
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VTC Spring - OFDM Receiver Performance Using Rotating Circular Array Antenna for Vehicle Communications
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics degrade significantly due to time variation of the channel properties. One solution is to rotate a circular array Antenna so as to decrease the speed of receiving Antenna relative to the ground [1]. When the vehicle speed changes, the Rotating Antenna needs to keep the optimum rotation speed. To solve this problem, we proposed a control method of the Rotating Antenna [2]. This method employs two rotation Antennas whose rotation speeds are slightly different. The steepest descent method based on the MSE of the demodulation output before and after of the vehicle speed changes is adopted to update the rotation speed. Our goal is to propose an easily implementable system using a single Rotating Antenna. In this paper, we propose a new control method on the rotation speed with a single Rotating Antenna by applying the margin of MSE between two successive symbols. Simulation results show the effectiveness of the proposed method.
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WCNC - Rotation speed control method for OFDM receiver using Rotating circular array Antenna
2011 IEEE Wireless Communications and Networking Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotation speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
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A study on improving OFDM performance by controlling speed of Rotating circular array Antenna
2010 10th International Symposium on Communications and Information Technologies, 2010Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotational speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
Hironori Ogihara - One of the best experts on this subject based on the ideXlab platform.
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ofdm receiver performance using Rotating circular array Antenna for vehicle communications
Vehicular Technology Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics degrade significantly due to time variation of the channel properties. One solution is to rotate a circular array Antenna so as to decrease the speed of receiving Antenna relative to the ground [1]. When the vehicle speed changes, the Rotating Antenna needs to keep the optimum rotation speed. To solve this problem, we proposed a control method of the Rotating Antenna [2]. This method employs two rotation Antennas whose rotation speeds are slightly different. The steepest descent method based on the MSE of the demodulation output before and after of the vehicle speed changes is adopted to update the rotation speed. Our goal is to propose an easily implementable system using a single Rotating Antenna. In this paper, we propose a new control method on the rotation speed with a single Rotating Antenna by applying the margin of MSE between two successive symbols. Simulation results show the effectiveness of the proposed method.
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rotation speed control method for ofdm receiver using Rotating circular array Antenna
Wireless Communications and Networking Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotation speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
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VTC Spring - OFDM Receiver Performance Using Rotating Circular Array Antenna for Vehicle Communications
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics degrade significantly due to time variation of the channel properties. One solution is to rotate a circular array Antenna so as to decrease the speed of receiving Antenna relative to the ground [1]. When the vehicle speed changes, the Rotating Antenna needs to keep the optimum rotation speed. To solve this problem, we proposed a control method of the Rotating Antenna [2]. This method employs two rotation Antennas whose rotation speeds are slightly different. The steepest descent method based on the MSE of the demodulation output before and after of the vehicle speed changes is adopted to update the rotation speed. Our goal is to propose an easily implementable system using a single Rotating Antenna. In this paper, we propose a new control method on the rotation speed with a single Rotating Antenna by applying the margin of MSE between two successive symbols. Simulation results show the effectiveness of the proposed method.
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WCNC - Rotation speed control method for OFDM receiver using Rotating circular array Antenna
2011 IEEE Wireless Communications and Networking Conference, 2011Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotation speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
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A study on improving OFDM performance by controlling speed of Rotating circular array Antenna
2010 10th International Symposium on Communications and Information Technologies, 2010Co-Authors: Hironori Ogihara, Hiroshi YasukawaAbstract:In high-speed mobile OFDM communication systems, receiving characteristics are degraded badly by channel time variation. One solution is to rotate a circular array Antenna so as to decrease the speed of the receiving Antenna relative to the ground[1]. In the conventional approach[2], Antenna radius was controlled to match vehicle speed, but realizing a radius control system is difficult. Our goal is to propose an easily implementable system based on Rotating Antenna. In this paper, we propose a method which controls the rotational speed of an Antenna to avoid the effect of velocity change. Simulation results show the effectiveness of the proposed method.
E Ochin - One of the best experts on this subject based on the ideXlab platform.
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gnss spoofing detection using static or Rotating single Antenna of a static or moving victim
IEEE Access, 2018Co-Authors: L Dobryakova, Lukasz S Lemieszewski, E OchinAbstract:GNSS spoofing works as follows: the GNSS signal generator transmits a signal simulation of several satellites at the GNSS frequency. If the level of the simulated signal exceeds the signal strength of real satellites, the GNSS receiver will “capture” the fake signal and calculate the position based on it. All receivers that fall into the spoofing zone will calculate the same coordinates, while the receivers located in different places will have a slight mismatch in time. The interference can be done away with such interference that simulates the movement of the receiver along the path defined by the spoofer. Receiver of the GNSS signals determines the XYZT coordinates. Suppose that the receiver has a built-in clock, the accuracy of which is comparable to the accuracy of the clock of GNSS, i.e., in the framework of this paper, we abstract from the need for correction of T. For a ship, only the XY coordinates are significant, so we will focus only on the calculations of the XY coordinates, and the Z coordinate is used only to detect a spoofing. This paper proposes three methods of spoofing detection using a single Antenna, including measuring the altitude of a victim, measuring the coordinates of a moving victim at two points on the route, and measuring the victim’s coordinates in two points of space using a Rotating Antenna.
Mingquan Lu - One of the best experts on this subject based on the ideXlab platform.
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GNSS Spoofing Countermeasure With a Single Rotating Antenna
IEEE Access, 2017Co-Authors: Fei Wang, Hong Li, Mingquan LuAbstract:Security of global navigation satellite systems (GNSS) is important since the navigation capability provided by the GNSS is a key enabler for many civilian and military applications. Spoofing attacks threaten the GNSS security and have caught much attention recently. The spatial processing method is one of the most robust GNSS spoofing countermeasures, which detects spoofing signals with a moving Antenna or multi-Antenna, but it cannot work in a static single-Antenna receiver. In this paper, we propose a spoofing countermeasure based on the power measurements of a single Rotating Antenna, which can be implemented in a static receiver. The method takes advantages of the anisotropy of the Antenna's gain pattern to detect spoofing signals. When the Antenna is Rotating, the power measurements of the spoofing signals coming from the same direction change similarly and the correlation coefficients between them are close to 1, but the power measurements of the authentic signals are uncorrelated. Since it is not easy to evaluate the anti-spoofing performance of the correlation coefficient, another metric named phase difference of power measurements is proposed. Its theoretical performance is derived based on generalized likelihood ratio test and validated with simulations. Actual experiments indicate that both the simulated and meaconing spoofing signals can be distinguished from the authentic ones, and the method can be implemented in a static or low-dynamic conventional receiver, only with an additional low-cost rotary table.
Silvestro Rocchio - One of the best experts on this subject based on the ideXlab platform.
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SAR imagery by RotoSAR
2015 IEEE International Conference on Microwaves Communications Antennas and Electronic Systems (COMCAS), 2015Co-Authors: Massimiliano Pieraccini, Federico Papi, Silvestro RocchioAbstract:In this paper a Rotating Antenna GB-SAR, that we named RotoSAR, is proposed and tested. The radar head is fixed at a Rotating arm and the Antennas are aimed in direction orthogonal to the rotation plane. Potential and limits of this configuration is studied, with simulations and in-field measurements, with particular regard to imagery performances.
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A Rotating Antenna Ground-Based SAR
2015 European Microwave Conference (EuMC), 2015Co-Authors: Massimiliano Pieraccini, Federico Papi, Nicola Agostini, Silvestro RocchioAbstract:In this paper a Rotating Antenna GB-SAR, that we named RotoSAR, has been proposed and tested. The radar head is fixed at a Rotating arm and the Antennas are aimed in direction orthogonal to the rotation plane. The obtained results both in simulation and in-field tests, show that imagery quality performances are comparable to the linear SAR. On the other hand, the proposed approach is potentially much more faster than conventional Ground Based linear SAR.
