• Title, Summary, Keyword: FMCW

Search Result 155, Processing Time 0.034 seconds

Development of Tracking Technique against FMCW Proximity Fuze (FMCW방식 근접신관 신호 추적 기법 개발)

  • Hong, Sang-Geun;Choi, Song-Suk;Shin, Dong-Cho;Lim, Jae-Moon
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.13 no.5
    • /
    • pp.910-916
    • /
    • 2010
  • A modern artillery use a FMCW Proximity Fuze for effectively target destruction. FMCW Proximity Fuze can be deceived by Jamming Technique because it uses RF for distance estimation. FMCW Proximity Fuze algorithm is similar to FMCW radar's, but normal Jamming Tech. like Noise and Mulitone is useless. Most Shots with FMCW Proximity Fuze have a additional mechanical fuze against RF Jamming. Shots explode by mechanical fuze when Proximity Fuse is Jammed. However, distance Deception is available because shots can not distinguish between deception jamming signal and ground reflected signal. For making Distance Deception Jamming, FMCW signal tracking is demanded. In this paper, we propose a FMCW tracking method and develop the Jammer to show Jamming signal.

High Resolution FMCW Level Gauge with Narrowband FMCW Radar (협대역 FMCW 레이더를 이용한 고해상도 레벨게이지)

  • Eum, Soung-Hyun;Oh, Woo-Jin
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.16 no.5
    • /
    • pp.899-905
    • /
    • 2012
  • Level Gauge using FMCW Radar is widely used and researched in many areas because of contactless, long range and flexibility. However FMCW level gauge requires wideband RF bandwidth for archiving high resolution of cm grade. In this paper we propose a new tx sawtooth waveform and processing algorithm with narrowband RF for wideband performance. The proposed method is based on STFT(Short-time fourier transform) and single sinusoidal carrier estimation method. From some experiments, we show that the resolution is improved upto 8 times with 300MHz FMCW radar.

The analysis of the detection probability of FMCW radar and implementation of signal processing part (차량용 FMCW 레이더의 탐지 성능 분석 및 신호처리부 개발)

  • Kim, Sang-Dong;Hyun, Eu-Gin;Lee, Jong-Hun;Choi, Jun-Hyeok;Park, Jung-Ho;Park, Sang-Hyun
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.12
    • /
    • pp.2628-2635
    • /
    • 2010
  • This paper analyzes the detection probability of FMCW (Frequency Modulated Continuous Wave) radar based on Doppler frequency and analog-digital converter bit and designs and implements signal processing part of FMCW radar. For performance evaluation, the FMCW radar system consists of a transmitted part and a received part and uses AWGN channel. The system model is verified through analysis and simulation. Frequency offset occurs in the received part caused by the mismatching between the received signal and the reference signal. In case of Doppler frequency less than about 38KHz, performance degradation of detection does not occur in FMCW radar with 75cm resolution The analog-digital converter needs at least 6 bit in order not to degrade the detection probability. And, we design and implement digital signal processing part based on DDS chip of digital transmitted signal generator for FMCW radar.

Implementation and Road Test of Signal Processing Unit for FMCW vehicle Radar system (차량용 FMCW 레이더 신호처리부 개발 및 주행시험)

  • Oh, Woo-Jin;Lee, Jong-Hun
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.7
    • /
    • pp.1565-1571
    • /
    • 2010
  • FMCW(Frequency Modulation Continuous Wave) Radar is very useful for vehicle collision warning system because of the simplicity. In this work, a signal processing part of FMCW vehicle radar system is implemented with flexibility using DSP, FPGA, ADC, and DAC so that the system could adopt lots of algorithm and could be improved through road test. It is shown that the system meets basic requirements as designed, and finds some problems in road test. We briefly discuss the problem which are caused by shadow effect from overlapped target and the distortion of beat frequency from the nonlinearity of VCO and the RCS of vehicle.

Development of a FMCW Radar Using a Compensation Algorithm for VCO Nonlinearity (VCO 비선형 보상 알고리듬을 적용한 근거리 측정용 FMCW 레이더 개발)

  • Chun, Joong Chang;Lee, Hyun Soo;Sohn, Jong Yoon;Kim, Tae Soo
    • Journal of the Korea Industrial Information Systems Research
    • /
    • v.19 no.1
    • /
    • pp.25-30
    • /
    • 2014
  • In this paper, we have implemented an FMCW radar for a near distance measurement. In the structure of the FMCW radar, it is a key problem to solve the VCO nonlinearity. In this work, we have adopted a VCO nonlinearity compensation algorithm using the spectrum correlation of beat signals. The radar experimented in this work uses an X-band(9.55~10.25GHz) microwave signal, and realizes precision of 3% in the range of 30m. The prototype can be applied to the front surveillance radar such as in vehicle anti-collision and probing robot mission.

Application and Analysis of 1D FRI (Finite Rate of Innovation) Super-resolution Technique in FMCW Radar (FMCW 레이더에서의 1D FRI (Finite Rate of Innovation) 초고해상도 기법 적용 및 분석)

  • Yoo, Kyungwoo;Kong, Seung-Hyun
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.22 no.7
    • /
    • pp.31-39
    • /
    • 2014
  • Recently, as Intelligent Transportation System (ITS) and self-driving system become influential in the ground transportation system, automotive radar systems have been actively studied among the various radar systems to implement the vehicle collision detection system and distance measurement system between vehicles. Most of the automotive radars are Frequency Modulated Continuous Wave (FMCW) radar type which can calculate distance and velocity of target by estimating the frequency difference between the transmitted signal and received signal. Therefore, accurate frequency estimation is very important in the FMCW radar system. For this reason, to improve the measurement accuracy of the FMCW radar, Reverse Directional FRI (RD-FRI) Super-Resolution technique which has high frequency estimation accuracy is applied to the FMCW radar system. The feasibility of the proposed technique is evaluated with simulation results and compared with FFT and conventional Super-Resolution techniques. The simulation results show that the proposed technique estimates the frequency with high accuracy and the distance with centimeter accuracy.

Correction of Continuous Motion Effects for Airborne FMCW-SAR System (항공기 기반 FMCW-SAR 시스템의 연속이동효과 보정)

  • Hwang, Ji-hwan;Jung, Jungkyo;Kim, Duk-jin;Kim, Jin-Woo;Shin, He-Sub;Ok, Jae-Woo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.28 no.5
    • /
    • pp.410-418
    • /
    • 2017
  • Results of an analysis of the continuous motion effect for FMCW-SAR system and a signal processing to correct it are presented in this paper. SAR images reconstructed by back-projection algorithm are included as well. To analyze how platform velocity and sampling frequency affect the continuous motion effect, FMCW signal model was used, and the signal processing in time-doppler(t, $k_u$) domain was adopted. Then, back-projection algorithm and modified matched-filter was used to reconstruct SAR images, and it was validated using measured data by airborne FMCW-SAR system in X-band frequency.

FMCW Radar simulation model with interference using a new radar performance parameter (새로운 레이더 성능지표를 이용한 FMCW 레이더 간섭 시뮬레이션 모델)

  • Mun, Sang-Kon;Park, Seung-Keun;Yang, Hoon-Gee;Cheon, Chang-Yul;Chung, Young-Seek;Bae, Kyung-Bin
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.10 no.4
    • /
    • pp.86-92
    • /
    • 2011
  • ITS(Intelligent Transport System) has been researched actively to guarantee the smooth traffic and the safety of the vehicle. In recent, as the sensor for the measurement of distance between vehicles, the FMCW radar system in millimeter wave band has been interested in ITS. Actually, 47, 60, 77, 94 and 139 GHz have been assigned for the vehicle radar frequencies in Europe and Japan. However, the performances of the FMCW radar are deteriorated due to the interferences from the surrounding radars and mobile devices. In this paper, in order to model and simulate the performance of FMCW radar under the exterior interference, we propose a new performance parameter, RER(Radius Error Rate), which contains the information of the range error due to the interferences, and show the effectiveness of the proposed parameter.

Simple Method for Improving the Frequency Sweep Linearity of FMCW Collision Warning Radar (차량 충돌방지용 FMCW 레이더의 주파수 Sweep 선형성 개선을 위한 간단한 기법)

  • Hyun, Eu-Gin;Oh, Woo-Jin;Lee, Jong-Hun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.21 no.10
    • /
    • pp.1109-1115
    • /
    • 2010
  • FMCW(Frequency Modulation Continuous Wave) Radar can detect the distance and the velocity of forward obstacles using linearly modulated FM signal. For better performance, the RF of radar should be operated with wideband frequency linearity on 300 MHz bandwidth at 77 GHz carrier frequency. In this paper, we propose a simple method for improving frequency linearity of FMCW radar implemented with VCO. The proposed method shows that the Voltage-Frequency relation of VCO could be measured by using the modified Tx waveform of FMCW radar. Then the measured nonlinearity could be compensated using LUT(Look-up Table) with easy. It is noted that the proposed can be adopted in existing system without extra circuit.

Ka-Band FMCW Sensor with High Linearity (고선형성을 갖는 Ka대역 FMCW 센서)

  • Kim, Jaehwan;Lee, Sungju;Kwon, Hyukja;Yang, Youngoo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.25 no.6
    • /
    • pp.671-678
    • /
    • 2014
  • This paper presents a Ka-band FMCW sensor that has high linearity by improving a nonlinear behavior of the voltage controlled oscillator. Due to the nonlinear characteristics of the voltage controlled oscillator for the conventional method, the drift of beat frequency can cause inaccuracy and errors to the extracted results. A Ka-band FMCW signal with fast transition time could be generated by using both direct digital synthesizer and phase locked loop in this research. The implemented FMCW sensor showed very high accuracy in beat frequency through the test.