DocumentCode :
776588
Title :
An Efficient Method of Eliminating the Range Ambiguity for a Low-Cost FMCW Radar Using VCO Tuning Characteristics
Author :
Park, Jung Dong ; Kim, Wan Joo
Author_Institution :
Agency for Defense Dev., Daejeon
Volume :
54
Issue :
10
fYear :
2006
Firstpage :
3623
Lastpage :
3629
Abstract :
This paper describes a simple method of eliminating the range ambiguity and the design approach for low-cost and small-size homodyne frequency-modulated continuous-wave (FMCW) radars. The range measurement accuracy could be efficiently improved by proper time gating of the beat signal without any closed-loop linearity compensation circuitry for typical varactor-tuned voltage-controlled oscillators (VCOs). The presented selectively gated fast Fourier transformation method is immune to the frequency shift of the VCOs. A W-band FMCW radar using a raw varactor-tuned VCO having the percent linearity of 7.16% was implemented, and achieved less than 2% ranging error of the target lying at 200 m. Owing to the simple structure and fast processing speed, this method is applicable to the various low-cost radar sensors for ranging and detection
Keywords :
CW radar; FM radar; circuit tuning; distance measurement; fast Fourier transforms; varactors; voltage-controlled oscillators; 200 m; FMCW radar; VCO tuning characteristics; W-band radar; beat signal; fast Fourier transformation; frequency shift; homodyne radars; radar sensors; range ambiguity; range measurement; time gating; varactor-tuned VCO; Bandwidth; Frequency; Linearity; Low-frequency noise; Radar applications; Sensor systems and applications; Signal resolution; Transmitters; Tuning; Voltage-controlled oscillators; Frequency-modulated continuous wave (FMCW); linearity; radar; range resolution;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2006.882869
Filename :
1705680
Link To Document :
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