• Title/Summary/Keyword: 조향동작

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Performance Comparison of 28 GHz Array Antennas for 5G Mobile Devices (5G 단말용 28 GHz 배열안테나의 안테나 타입별 성능 비교 연구)

  • Kim, Sun-Ryul;Hong, Young-Taek;Bang, Ji-Hoon;Choi, Jae-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.1
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    • pp.45-53
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    • 2019
  • In this paper, three types of array antennas for 5G mobile devices operating at 28 GHz were designed, and their performances were compared. The isolation between antenna elements was compared based on $S_{21}$. The $S_{21}$ of dipole, slot, and patch type are -13.76 dB, -16.88 dB, and -11.47 dB, respectively, with the slot-type antenna having the highest isolation. In order to compare the beam coverage performance, several characteristics such as beam width and maximum beam steering angle were analyzed. The analysis shows that the slot type has the widest steering angle of $63^{\circ}$ while the patch type has narrowest with $36^{\circ}$. In addition, to verify the performance of the antennas in the actual usage environment of the device, antenna characteristics in talk mode and data mode were analyzed through simulation. The results confirmed that the slot-type array antenna is the most suitable array antenna element for 28 GHz 5G mobile devices.

A Study on the Haptic Control Technology for Unmanned Military Vehicle Driving Control (무인차량 원격주행제어를 위한 힘반향 햅틱제어 기술에 관한 연구)

  • Kang, Tae-Wan;Park, Ki-Hong;Kim, Joon-Won;Kang, Seok-Won;Kim, Jae-Gwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.12
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    • pp.910-917
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    • 2018
  • This paper describes the developments to improve the feeling and safety of the remote control system of unmanned vehicles. Generally, in the case of the remote control systems, a joystick-type device or a simple steering-wheel are used. There are many cases, in which there are operations without considering the feedback to users and driving feel. Recently, as the application area of the unmanned vehicles has been extended, the problems caused by not considering the feedback are emphasized. Therefore, the need for a force feedback-haptic control arises to solve these problems. In this study, the force feedback-haptic control algorithm considering the vehicle parameters is proposed. The vehicle parameters include first the state variables of dynamics, such as the body side-slip angle (${\beta}$) and yawrate (${\gamma}$), and second, the parameters representing the driving situations. Force feedback-haptic control technology consists of the algorithms for general and specific situations, and considers the situation transition process. To verify the algorithms, a simulator was constructed using the vehicle dynamics simulation tool with CAN communication environment. Using the simulator, the feasibility of the algorithms was verified in various scenarios.

Reconfigurable Beam Steering Antenna Using Superposed Beam of Double Loops (이중 루프의 중첩 빔을 이용한 재구성 빔 조향 안테나)

  • Kim, Jae-Young;Jung, Chang-Won
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.10
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    • pp.934-940
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    • 2011
  • A novel reconfigurable beam steering antenna using double loops is proposed. The double loop antenna has a superposed beam which is produced by combining the in-phase beam in the inner loop with the out-of-phase beam in the outer loop. Also, the doble loop antenna uses two artificial switches to connect between inner loop and outer loop, and has the beam directions of three separate cases(Case 1, Case 2, Case 3) by changing ON/OFF states of switches. The operation frequency of the antenna is 14.5 GHz, and three maximum beam directions of the antenna are ${\phi}_{max}=0^{\circ}$, ${\theta}_{max}=0^{\circ}$(Case 1), ${\phi}_{max}=230^{\circ}$, ${\theta}_{max}=40^{\circ}$(Case 2) and ${\phi}_{max}=130^{\circ}$, ${\theta}_{max}=40^{\circ}$ (Case 3). The peak gains of each case are 6.5 dBi(Case 1), 7.6 dBi(Case 2) and 7.8 dBi(Case 3). The half power beam width(HPBW) of each case is $86{\sim}104^{\circ}$, and the overall HPBW is $160^{\circ}$.

A Novel Equalization Method of Multiple Transceivers of Multiple Input Multiple Output Antenna for Beam-farming and the Estimation of Direction of Arrival (빔조향 및 전파도래각 추정을 위한 새로운 다중입력 다중출력 안테나 송수신부 구성방법)

  • 이성종;이종환;염경환;윤찬의
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.3
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    • pp.288-300
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    • 2002
  • In this paper, a novel method of equalization of RF transceivers is suggested for MIMO(Multiple Input Multiple Output) antenna actively studied for high speed data transmission in the recent IMT-2000 system. The core of suggestion is in equalizing the transfer characteristics of multiple transceivers using feedback and memory during the predefined calibration time. This makes it possible to weight the signals in the intermediate frequency, which is easier in the application of recently developed DoA(Direction of Arrival) algorithms. In addition, the time varying optimum cell formation according to traffic is feasible by antenna beam-forming based on the DoA information. The suggested method of equalizing multiple transceivers are successfully verified using envelope simulation. two outputs. This paper is concerned with the diagnosis of multiple crosstalk-faults in OSM. As the network size becomes larger in these days, the convent.nal diagnosis methods based on tests and simulation be.me inefficient, or even more impractical. We propose a simple and easily implementable alg?ithm for detection and isolation of the multiple crosstalk-faults in OSM. Specifically, we develop an algorithm for isolation of the source fault in switc.ng elements whenever the multiple crosstalk-faults are.etected in OSM. The proposed algorithm is illustrated by an example of 16$\times$16 OSM.

Development of a Series Hybrid Propulsion System for Bimodal Tram (바이모달 트램용 직렬형 하이브리드 추진시스템 개발)

  • Bae, Chang-Han;Lee, Kang-Won;Mok, Jai-Kyun;You, Doo-Young;Bae, Jong-Min
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.5
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    • pp.494-502
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    • 2011
  • Bimodal tram is designed to run on a dedicated path in automatic mode using a magnetic track system in order to realize a combination of the accessibility of a bus and the constant regularity of a railroad. This paper presents design and test results of the series hybrid propulsion system of the bimodal tram on both test track and public road, which uses CNG (Compressed Natural Gas) engine and Lithium polymer battery pack. This paper describes the real-time data measuring equipment for the series hybrid propulsion system of the bimodal tram. Using this measurement equipment, the performance of the prototype vehicle's driving on test track and public road was verified and the fuel consumption and the efficiency of CNG engine have been investigated.

Design of Array Antenna for Radar Wind Profiler using Bend-Dipole (Bend-다이폴을 이용한 RWP 배열안테나 설계)

  • Jeon, Jung-Ik;Choi, Young-Jo;Lee, Hyeong-Ki;Jeon, Jeong-Hwan
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.3
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    • pp.43-51
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    • 2020
  • In this paper, the design of 64 array antennas applied to RWP (Radar Wind Profiler) was described. The design point of the antenna is to ensure isolation between each element and to match the vertical / horizontal radiation pattern. To this end, a single element of the array antenna was proposed as a Bend dipole type, and through simulation, When sequentially sending 5 beams including vertical, the east/west/south/north direction was ±20°, and it was confirmed that no Grating Lobe occurred when steering the beam. The 64 array antenna proposed in this paper was designed with performance equal to or higher than that of overseas products, and was confirmed to be applicable to RWP.

Signal-Subspace-Based Simple Adaptive Array and Performance Analysis (신호 부공간에 기초한 간단한 적응 어레이 및 성능분석)

  • Choi, Yang-Ho
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.47 no.6
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    • pp.162-170
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    • 2010
  • Adaptive arrays reject interferences while preserving the desired signal, exploiting a priori information on its arrival angle. Subspace-based adaptive arrays, which adjust their weight vectors in the signal subspace, have the advantages of fast convergence and robustness to steering vector errors, as compared with the ones in the full dimensional space. However, the complexity of theses subspace-based methods is high because the eigendecomposition of the covariance matrix is required. In this paper, we present a simple subspace-based method based on the PASTd (projection approximation subspace tracking with deflation). The orignal PASTd algorithm is modified such that eigenvectora are orthogonal to each other. The proposed method allows us to significantly reduce the computational complexity, substantially having the same performance as the beamformer with the direct eigendecomposition. In addition to the simple beamforming method, we present theoretical analyses on the SINR (signal-to-interference plus noise ratio) of subspace beamformers to see their behaviors.

Development of Agriculture Auto Hose Reel by using Wheeled Mobile Robot (바퀴구동 로봇을 이용한 농업용 자동 호스 릴 장치 개발)

  • Kim, Kyoung-Chul;Ko, Min-Hyuc;Ryuh, Beom-Sahng
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1299-1304
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    • 2014
  • This paper is a study for developing an agriculture automatic hose reel of mobile robot. One of the important works in farming is pesticide spraying because it is related to the growth of crops. Therefore, we develop an automatic reel hose and mobile robot. Conducting kinematic analysis of steering performance, the mobile robot is designed to move smoothly even in a small space, and that is verified by simulation. To increase supplying accuracy of the automatic hose reel, the mobile robot use detecting tension mechanism on a hose and a device for the hose deployment. We conduct performance and on-farm evaluation. This system has been maximum speed of 2.5m/s, driving accuracy of ${\pm}0.18^{\circ}$ and driving safety speed of 2m/s. The system would solve an aging population and shortage of workforce in agriculture.

Development of the Multi-stage System with 4 DOF (4자유도 모션이 가능한 복합 무대 시스템 개발)

  • Lee, Sang-Won;Won, Daehee;Lee, Sulhee
    • The Journal of the Korea Contents Association
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    • v.15 no.5
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    • pp.18-26
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    • 2015
  • In this paper, we presented a design and control method of multi-stage with wagon and lift stage. Multi-stage system has 4 degree-of-freedom(DOF), i.e., forward/backward/left/right/rotate and up/down motion. Wagon mechanism in the type of two wheel and steering is proposed in order to improve for the maneuverability compared to the existing differential-type wagons. Also, the lift mechanism is designed by interlocking type in order to make the maximum height bigger than 10 times of the original height. We also proposed a path planning algorithm. The performance of the propped system is validated via multi motion experiments, so that the multi-stage system is useful for various performances production.

Performance evaluation using BER/SNR of wearable fabric reconfigurable beam-steering antenna for On/Off-body communication systems (On/Off-body 통신시스템을 위한 직물소재 웨어러블 재구성 빔 스티어링 안테나의 BER/SNR 성능 검증)

  • Kang, Seonghun;Jeong, Sangsoo;Jung, Chang Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.7
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    • pp.4842-4848
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    • 2015
  • This paper presents a comparison of communication performance between the reconfigurable beam-steering antenna and the omni-directional (loop) antenna during standstill and walking motion. Both omni-directional and reconfigurable antennas were manufactured on the same fabric (${\varepsilon}_r=1.35$, $tqn{\delta}=0.02$) substrate and operated around 5 GHz band. The reconfigurable antenna was designed to steer the beam directions. To implement the beam-steering capability, the antenna used two PIN diodes. The measured peak gains were 5.9-6.6 dBi and the overall half power beam width (HPBW) was $102^{\circ}$. In order to compare the communication efficiency, both the bit error rate (BER) and the signal-to-noise ratio (SNR) were measured using a GNU Radio Companion software tool and user software radio peripheral (USRP) devices. The measurement were performed when both antennas were standstill and walking motion in an antenna chamber as well as in a smart home environment. From these results, the performances of the reconfigurable beam steering antenna outperformed that of the loop antenna. In addition, in terms of communication efficiencies, in an antenna chamber was better than in a smart home environment. In terms of movement of antennas, standstill state has better results than walking motion state.