A Two Sweeping VCO Source for Heterodyne FMCW Radar

We propose and develop a heterodyne frequency modulated continuous wave (FMCW) radar system. The system operates at 14 GHz with a 500-MHz bandwidth in a 100-μs sweeping period, based on two wideband linear RF voltage-controlled oscillator (VCO) sweeping sources, which are controlled by a direct digi...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2013-01, Vol.62 (1), p.230-239
Main Authors: Dao, Manh-Tuan, Shin, Dong-Hun, Im, Yun-Taek, Park, Seong-Ook
Format: Article
Language:English
Subjects:
Baseband
Derivation
Direct digital synthesizer (DDS)
frequency-modulated continuous wave (FMCW)
heterodyne
Instrumentation
linearity
Noise
Oscillators
Phase locked loops
Phase noise
phase-locked loop (PLL)
Radar
Radio frequencies
Radio frequency
RF signals
Sweeping
Voltage controlled oscillators
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Summary:We propose and develop a heterodyne frequency modulated continuous wave (FMCW) radar system. The system operates at 14 GHz with a 500-MHz bandwidth in a 100-μs sweeping period, based on two wideband linear RF voltage-controlled oscillator (VCO) sweeping sources, which are controlled by a direct digital synthesizer (DDS) through a phase-locked scheme, leading to a high linearity of the frequency chirping signal. To achieve low phase noise, the RF signals are synthesized from low-noise baseband signals which are generated through a generation scheme of using phase-locked oscillators operating in the 800-MHz frequency range. Additionally, the proposed architecture can eliminate the phase noise contributions and/or frequency deviation due to the uncorrelation of different VCOs. The results are verified through measurements and derivation.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2012.2212510