Title :
A Two Sweeping VCO Source for Heterodyne FMCW Radar
Author :
Dao, Manh-Tuan ; Shin, Dong-Hun ; Im, Yun-Taek ; Park, Seong-Ook
Author_Institution :
Microwave & Antenna Lab., Electr. Eng. Dept., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
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.
Keywords :
CW radar; FM radar; direct digital synthesis; microwave oscillators; phase locked oscillators; voltage-controlled oscillators; DDS; direct digital synthesizer; frequency 14 GHz; frequency 500 MHz; frequency 800 MHz; frequency chirping signal; heterodyne FMCW radar; heterodyne frequency modulated continuous wave radar system; low-noise baseband signals; phase-locked scheme; two sweeping VCO source; wideband linear RF voltage-controlled oscillator sweeping sources; Baseband; Phase locked loops; Phase noise; RF signals; Radar; Radio frequency; Voltage-controlled oscillators; Direct digital synthesizer (DDS); frequency-modulated continuous wave (FMCW); heterodyne; linearity; phase-locked loop (PLL); radar;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2012.2212510