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http://dx.doi.org/10.5515/KJKIEES.2010.21.10.1109

Simple Method for Improving the Frequency Sweep Linearity of FMCW Collision Warning Radar  

Hyun, Eu-Gin (Division of Advanced Industrial Science & Technology, DGIST)
Oh, Woo-Jin (Dept. of Electronic Engineering, Kumoh National Institute of Technology)
Lee, Jong-Hun (Division of Advanced Industrial Science & Technology, DGIST)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.10, 2010 , pp. 1109-1115 More about this Journal
Abstract
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.
Keywords
FMCW Radar; Collision Warning System; VCO; Nonlinearity;
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