• Title/Summary/Keyword: Automotive radar

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Throttle/Brake Combined Control for Vehicle-to-vehicle Distance and Speed Control (찻간 속도/거리제어를 위한 구동력/제동력 통합제어)

  • 이세진;이경수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.137-142
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    • 2001
  • A throttle/brake control law for the intelligent cruise control(ICC) systems has been proposed in this paper. The ICC system consists of a vehicle detection sensor, the control algorithm and a throttle/brake actuators. The control performance has been investigated through vehicle tests. The test vehicle is equipped with a MMW radar sensor, a solenoid-valve-controlled Electronic-Vacuum-Booster(EVB) and a step-motor controlled throttle actuator. The results indicate the proposed throttle/brake control laws can provide satisfactory vehicle-to-vehicle distance and velocity control performance.

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Detection of Lane Curve Direction by Using Image Processing Based on Neural Network (차선의 회전 방향 인식을 위한 신경회로망 응용 화상처리)

  • 박종웅;장경영;이준웅
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.178-185
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    • 1999
  • Recently, Collision Warning System is developed to improve vehicle safety. This system chiefly uses radar. But the detected vehicle from radar must be decide whether it is the vehicle in the same lane of my vehicle or not. Therefore, Vision System is needed to detect traffic lane. As a preparative step, this study presents the development of algorithm to recognize traffic lane curve direction. That is, the Neural Network that can recognize traffic lane curve direction is constructed by using the information of short distance, middle distance, and decline of traffic lane. For this procedure, the relation between used information and traffic lane curve direction must be analyzed. As the result of application to sampled 2,000 frames, the rate of success is over 90%.t text here.

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A Study on Near Cut-In Performance Comparison on Adaptive Cruise Control Stop&Go (ACC Stop&Go 시스템의 근접 Cut-In 성능 비교에 대한 연구)

  • Lee, Dong-Han;Cho, Cheol-Ho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.2
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    • pp.103-109
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    • 2012
  • Adaptive cruise control Stop&Go system has been developed to reduce the driver's workload on highway or public road. This system is characterized by a moderate control of engine and brake actuator. A control system capable of modeling driver's driving characteristics has been constructed to provide natural vehicle behavior in full speed driving. But, ACC Stop&Go system has some limitations. One of the limitations is a detection limitation on near cut-in situation. This paper presents development of the near cut-in test procedure, finding of the limitation value on near cut-in scenario and performance comparisons on ACC Stop&Go system.

Radiation Characteristics of Parallel Slot Antenna for Automotive Radar System (자동차 레이더 시스템을 위한 병렬형 슬롯 방식 안테나의 방사 특성)

  • Kim, Byeong-Woo;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.11
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    • pp.1980-1985
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    • 2010
  • This paper is about design of optimal structure of slot antenna array antenna with inner waveguide in accordance with the slot model, and fabrication of its prototype sample operating at the frequency of 24 GHz. Results of this work can be employed as a useful tool to develop and diversify slot antenna having superior performance and omni-directivity to that of current antenna. The implemented antenna demonstrates ultra-wideband performance for frequency ranges 24 GHz with the relatively high and flat antenna gain of 18.64dBi and low sidelobe levels. In addition, a $2{\times}8$ antenna array for phased-array systems and mm-wave sensor applications is also presented.

Micromachined ultra-wideband beamforming network for automotive radar front ends (마이크로머신 기술로 제작한 자동차 프런트엔드용 초광대역 빔성형 네트워크)

  • Corona-Chavez, Alonso;Liamas-Garro, Ignacio;Kim, Jung-Mu;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.2386-2388
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    • 2005
  • As anti-crash and pre-crash systems in vehicles become more extensively used, the need for high performance short-range radars is playing an increasing role. This paper presents the design of a micromachined, ultra-wideband beamformer centered at 24 GHz for automotive short-range radar systems. This beamformer is a Butler matrix designed using ultra-wideband transmission-line couplers, which consist of a multilayered structure that exhibits wider bandwidth compared to conventional microstrip branch-line couplers. The circuit has been designed on a quartz substrate, and to achieve the desired coupling, lines suspended on BCB layers located at specific parts of the circuit were used, achieving a three metal layered structure in form of wide microstrips, that give low loss and a wideband response. In this paper the design and fabrication procedure of the proposed beamformer are fully described.

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77-GHz mmWave antenna array on liquid crystal polymer for automotive radar and RF front-end module

  • Kim, Sangkil;Rida, Amin;Lakafosis, Vasileios;Nikolaou, Symeon;Tentzeris, Manos M.
    • ETRI Journal
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    • v.41 no.2
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    • pp.262-269
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    • 2019
  • This paper introduces a low-cost, high-performance mmWave antenna array module at 77 GHz. Conventional waveguide transitions have been replaced by 3D CPW-microstrip transitions which are much simpler to realize. They are compatible with low-cost substrate fabrication processes, allowing easy integration of ICs in 3D multi-chip modules. An antenna array is designed and implemented using multilayer coupled-fed patch antenna technology. The proposed $16{\times}16$ array antenna has a fractional bandwidth of 8.4% (6.5 GHz) and a 23.6-dBi realized gain at 77 GHz.

Implementation of High Range Resolution FMCW Radar for Short-Range Automotive Applications (차량용 근거리 계측을 위한 고분해능 FMCW 레이더의 구현)

  • 김찬헌;김수범;공영균;김영수
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.324-327
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    • 2001
  • In this paper, a 24GHz FMCW radar system which measures the range and the relative velocity of a vehicle in close range is described. The intended ranging accuracy is 15cm and a possible system concept to achieve this objective is presented. The VCO nonlinearity correction method using a reference delay-line and the data extrapolation algorithms based on AR(autoregressive) model are applied. The implemented system shows relatively satisfactory results in ranging accuracy.

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A CPW-Based 77 GHz Power Amplifier with Cascode Structure Using a 130 nm In0.88GaP/In0.4AlAs/In0.4GaAs mHEMTs

  • Kim, Young-Min;Koh, Yu-Min;Park, Young-Rak;Lee, Si-Young;Seo, Kwang-Seok;Kwon, Young-Woo
    • Journal of electromagnetic engineering and science
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    • v.9 no.4
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    • pp.218-222
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    • 2009
  • In this paper, we present a CPW-based 77 GHz 3-stage power amplifier MMIC for automotive radar systems. The power amplifier MMIC has been realized using a 130 nm $In_{0.88}$GaP/$In_{0.4}$AlAs/$In_{0.4}$GaAs metamorphic high-electron mobility transistors(mHEMTs) technology and an output stage with a cascode configuration. This produced a good output power and gain performance at 77 GHz. The fabricated power amplifier MMIC exhibited a small-signal gain of 18 dB, an output power of 17 dBm and 9 % power added efficiency(PAE) at 77 GHz with a total gate width of 800 ${\mu}m$ in the output stage. These performances could be useful to low-cost and small-sized components for 77 GHz automotive radar systems.

Design of 77 GHz Automotive Radar Interferer Generator (77 GHz 차량용 레이다 간섭신호 발생기 설계)

  • Kim, Dong-Kyun;Cui, Chenglin;Kwon, Oh-Yun;Yoon, Chai-Won;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.9
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    • pp.865-871
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    • 2016
  • This work presents a radar signal interferer to be used for evaluating the mutual interference among automotive radars. The developed interfering signal generator is composed of a reference signal generator and a 77 GHz transmitter. Reference signal generator is made up of commercial chips and board, it can generate various modulated signal such as triangular wave, sawtooth wave and random frequency hopping. The transmitter generates 77 GHz band signal by multiplying modulated reference signal frequency 28 times. Transmitter was fabricated using 65 nm CMOS process, it can operate horn antenna by built in on-chip waveguide feeder. The transmitter exhibited 7.31~8.06 dBm output power over a frequency lock range of 75.6~77 GHz.

A 77GHz MMIC Transceiver Module for Automotive Forward-Looking Radar Sensor

  • Kang, Dong-Min;Hong, Ju-Yeon;Shim, Jae-Yeob;Yoon, Hyung-Sup;Lee, Kyung-Ho
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.609-610
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    • 2006
  • A 77GHz MMIC transceiver module consisting of a power amplifier, a low noise amplifier, a drive amplifier, a frequency doubler and a down-mixer has been developed for automotive forward-looking radar sensor. The MMIC chip set was fabricated using $0.15{\mu}m$ gate-length InGaAs/InAlAs/GaAs mHEMT process based on 4-inch substrate. The power amplifier demonstrated a measured small signal gain of over 20dB from $76{\sim}77GHz$ with 15.5dBm output power. The chip size is $2mm{\times}2mm$. The low noise amplifier achieved a gain of 20dB in a band between $76{\sim}77\;GHz$ with an output power of 10dBm. The chip size is $2.2mm{\times}2mm$. The driver amplifier exhibited a gain of 23dB over a $76{\sim}77\;GHz$ band with an output power of 13dBm. The chip size is $2.1mm{\times}2mm$. The frequency doubler achieved an output power of -16dBm at 76.5GHz with a conversion gain of -16dB for an input power of 10dBm and a 38.25GHz input frequency. The chip size is $1.2mm{\times}1.2mm$. The down-mixer demonstrated a measured conversion gain of over -9dB. The chip size is $1.3mm{\times}1.9mm$. The transceiver module achieved an output power of 10dBm in a band between $76{\sim}77GHz$ with a receiver P1dB of -28dBm. The module size is $8{\times}9.5{\times}2.4mm^3$. This MMIC transceiver module is suitable for the 77GHz automotive radar systems and related applications in W-band.

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