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A Two Sweeping VCO Source for Heterodyne FMCW Radar

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4 Author(s)
Manh-Tuan Dao ; Microwave & Antenna Lab., Electr. Eng. Dept., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Dong-Hun Shin ; Yun-Taek Im ; Seong-Ook Park

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.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:62 ,  Issue: 1 )

Date of Publication:

Jan. 2013

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