• Title/Summary/Keyword: Automotive radar

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Interference Cancelation Method for Intelligent Vehicle Radar (차량용 레이더 간섭 제거 신호처리 방법)

  • Hyun, Eu-Gin;Lee, Jong-Hun
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.45 no.6
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    • pp.35-41
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    • 2008
  • The most important requirement for the automotive radars is the simultaneous target range and velocity measurement under environment of multi-target, clutters, multi-path, and so on. If the many vehicles with 77GHz FMCW(Frequency Modulation Continuous Wave) radar system are in the near area we should consider the interference signals occurred by other radar systems because these signals reduce exact detection of range and velocity. In this paper, we propose the interference cancellation method, which each vehicle radar transmits chirp trains with the different frequency sweep shapes. The proposed method is applied into the various applications such as an intelligent vehicle, Robot, and UGV(Unmanned Ground Vehicle).

Implementation of an LFM-FSK Transceiver for Automotive Radar

  • Yoo, HyunGi;Park, MyoungYeol;Kim, YoungSu;Ahn, SangChul;Bien, Franklin
    • IEIE Transactions on Smart Processing and Computing
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    • v.4 no.4
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    • pp.258-264
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    • 2015
  • The first 77 GHz transceiver that applies a heterodyne structure-based linear frequency modulation-frequency shift keying (LFM-FSK) front-end module (FEM) is presented. An LFM-FSK waveform generator is proposed for the transceiver design to avoid ghost target detection in a multi-target environment. This FEM consists of three parts: a frequency synthesizer, a 77 GHz up/down converter, and a baseband block. The purpose of the FEM is to make an appropriate beat frequency, which will be the key to solving problems in the digital signal processor (DSP). This paper mainly focuses on the most challenging tasks, including generating and conveying the correct transmission waveform in the 77 GHz frequency band to the DSP. A synthesizer test confirmed that the developed module for the signal generator of the LFM-FSK can produce an adequate transmission signal. Additionally, a loop back test confirmed that the output frequency of this module works well. This development will contribute to future progress in integrating a radar module for multi-target detection. By using the LFM-FSK waveform method, this radar transceiver is expected to provide multi-target detection, in contrast to the existing method.

Radar-based Security System: Implementation for Cluttered Environment

  • Lee, Tae-Yun;Skvortsov, Vladimir;Ka, Min-Ho
    • Journal of IKEEE
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    • v.19 no.2
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    • pp.160-167
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    • 2015
  • We present an experimental implementation of the inexpensive microwave security sensor that can detect both static and slowly moving objects in cluttered environment. The prototype consists of a frequency-modulated continuous wave radar sensor, control board or computer and software. The prototype was tested in a cluttered indoor environment. In case of intrusion or change of environment the sensor will give an alarm, determine the location of new object, change in its location and can detect a slowly moving target. To make a low-cost unit we use commercially available automotive radar and own signal processing techniques for object detection and tracking. The intruder detection is based on a comparison between current 'image' in memory and 'no-intrusion' reference image. The main challenge is to develop a reliable technique for detection of a relatively low-magnitude object signals hidden in multipath clutter echo signals. Various experimental measurements and computations have shown the feasibility and performance of the system.

Design of Q-Band LC VCO and Injection Locking Buffer 77 GHz Automotive Radar Sensor (77 GHz 자동차용 레이더 센서 응용을 위한 Q-밴드 LC 전압 제어 발진기와 주입 잠금 버퍼 설계)

  • Choi, Kyu-Jin;Song, Jae-Hoon;Kim, Seong-Kyun;Cui, Chenglin;Nam, Sang-Wook;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.3
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    • pp.399-405
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    • 2011
  • In this paper, we present the design of Q-band LC VCO and injection locking buffer for 77 GHz automotive radar sensor using 130 nm RF CMOS process. To improve the phase noise characteristic of LC tank, the transmission line is used. The negative resistance by the active device cross-coupled pair of buffer is used for high output power, with or without oscillation of buffer. The measured phase noise is -102 dBc/Hz at 1 MHz offset frequency and tuning range is 34.53~35.07 GHz. The output power is higher than 4.1 dBm over entire tuning range. The fabricated chip size is $510{\times}130\;um^2$. The power consumption of LC VCO is 10.8 mW and injection locking buffer is 50.4 mW from 1.2 V supply.

InGaAs Nano-HEMT Devices for Millimeter-wave MMICs

  • Kim, Sung-Won;Kim, Dae-Hyun;Yeon, Seong-Jin;Seo, Kwang-Seok
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.6 no.3
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    • pp.162-168
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    • 2006
  • To fabricate nanometer scale InGaAs HEMTs, we have successfully developed various novel nano-patterning techniques, including sidewall-gate process and e-beam resist flowing method. The sidewall-gate process was developed to lessen the final line length, by means of the sequential procedure of dielectric re-deposition and etch-back. The e-beam resist flowing was effective to obtain fine line length, simply by applying thermal excitation to the semiconductor so that the achievable final line could be reduced by the dimension of the laterally migrated e-beam resist profile. Applying these methods to the device fabrication, we were able to succeed in making 30nm $In_{0.7}Ga_{0.3}As$ HEMTs with excellent $f_T$ of 426GHz. Based on nanometer scale InGaAs HEMT technology, several high performance millimeter-wave integrated circuits have been successfully fabricated, including 77GHz MMIC chipsets for automotive radar application.

A Design of 77 GHz LNA Using 65 nm CMOS Process (65 nm CMOS 공정을 이용한 77 GHz LNA 설계)

  • Kim, Jun-Young;Kim, Seong-Kyun;Cui, Chenglin;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.9
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    • pp.915-921
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    • 2013
  • This work presents a 77 GHz low noise amplifier(LNA) for automotive radar systems using 65 nm RF CMOS process. The LNA is composed of three stage common source amplifiers and includes transmission line matching networks. To reduce the time for three dimensional EM simulation, we optimize the transmission line impedance matching network using a pre-built EM library. The proposed compact simulation technique is confirmed by measurement results. The peak gain of the LNA is 10 dB at 77 GHz and input/output return losses are below -10 dB around the design frequency.

A Vehicle Adaptive Cruise Control Design in Consideration of Human Driving Characteristics (운전자 주행 특성을 고려한 차량 적응 순항 제어기 설계)

  • Gu, Ja-Sung;Yi, Kyong-Su
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.2
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    • pp.32-38
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    • 2006
  • A vehicle adaptive cruise control strategy based on human drivers' driving characteristics has been investigated. Human drivers driving characteristics have been analyzed using vehicle test data obtained from 125 participants. The control algorithm has been designed to incorporate the driving characteristics of the human drivers and to achieve natural vehicle behavior of the controlled vehicle that would reduce the workload of the human driver. Vehicle following characteristics of the cruise controlled vehicle have been compared to real-world driving radar sensor data of human drivers using a validated vehicle simulator. and compare nominal cruise control and adaptive cruise control.

ISAR Imaging Using Rear View Radars of an Automobile (후방 감시 차량용 레이다를 이용한 ISAR 영상 형성)

  • Kang, Byung-Soo;Lee, Hyun-Seok;Lee, Seung-Jae;Kang, Min-Suk;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.2
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    • pp.245-250
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    • 2014
  • This paper introduces the inverse synthetic aperture radar(ISAR) imaging technique for rear view target of an automobile, which uses both linear frequency modulation-frequency shift keying(LFM-FSK) waveform and monopulse tracking. LFM-FSK waveform consists of two sequential stepped frequency waveforms with some frequency offset, and thus, can be used to generate ISAR images of rear view target of an automobile. However, ISAR images can often be blurred due to non-uniform change rate of relative aspect angle between radar and target. In order to address this problem, one-dimensional(1-D) Lagrange interpolation technique in conjunction with angle information obtained from the monopulse tracking is applied to generate uniform data across the radar's aspect angle. Simulation results show that the proposed method can provide focused ISAR images.

65 nm CMOS Base Band Filter for 77 GHz Automotive Radar Compensating Path Loss Difference (경로 손실 변화의 보상이 가능한 77 GHz 차량용 레이더 시스템을 위한 65 nm CMOS 베이스밴드 필터)

  • Kim, Young-Sik;Lee, Seung-Jun;Eo, Yun-Seong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.10
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    • pp.1151-1156
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    • 2012
  • In this paper, the baseband filter is proposed in order to maintain a constant sensitivity regardless of distances for 77 GHz automotive radar system. Using existing DCOC loop circuit can remove DC offset and also cancel differences of received power depending on the distance. Measured results show that the maximum gain is 51 dB and high pass cutoff frequency can be tuned from 5 kHz to 15 kHz. The slope of high pass filter can be tuned from -10 to -40 dB/decade for the distance compensation. The measured NF and IIP3 are 26 dB and +4.5 dBm with 4.3 mA at 1.0 V supply voltage, respectively. The fabricated die size $500{\mu}m{\times}1,050{\mu}m$ excluding the in/out pads.

Design of 77 GHz Radar Transmitter Using 13 GHz CMOS Frequency Synthesizer and Multiplier (13 GHz CMOS 주파수 합성기와 체배기를 이용한 77 GHz 레이더 송신기 설계)

  • Song, Ui-Jong;Kang, Hyun-Sang;Choi, Kyu-Jin;Cui, Chenglin;Kim, Seong-Kyun;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.11
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    • pp.1297-1306
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    • 2012
  • This work presents a 77 GHz radar transmitter for the automotive radar system. An integrated 13 GHz frequency synthesizer fabricated using 130 nm RF CMOS process drives a commercial W-band compound semiconductor monolithic multifunction amplifier(MPA), which includes a frequency multiplier by six to generate 77 GHz transmitting signal. The 13 GHz frequency synthesizer includes a high efficiency injection buffer of 4 dBm output power to drive the MPA. The output power of 77 GHz radar transmitter is higher than 13.99 dBm and the magnitude of the reference spur relative to the carrier is -36.45 dBc. The phase noise is -81 dBc/Hz at 1 MHz offset frequency from the carrier.