Journal
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Volume 63, Issue 6, Pages 1727-1731Publisher
WILEY
DOI: 10.1002/mop.32805
Keywords
frequency modulated continuous wave (FMCW) radar; noise floor; phase noise; processing gain; radar parameter; uncorrelated phase noise (UPN)
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2B5B01069407]
- National Measurement Standard Services and Technical Services for SME - Korea Research Institute of Standards and Science [KRISS - 2021 - GP2021-0013]
- National Research Foundation of Korea [2019R1A2B5B01069407] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The letter proposes a strategic decision method for selecting parameter values in heterodyne FMCW radar to achieve a low noise floor over the middle-long range. Experimental results confirm that the proposed method significantly reduces the noise floor.
Heterodyne architecture has been frequently chosen to resolve the problem of dc offset in frequency modulated continuous wave (FMCW) radar. However, heterodyne FMCW radars use different local oscillators, resulting in uncorrelated phase noise (UPN) in beat signals. Therefore, the inherent leakage signal in the heterodyne FMCW radar also has UPN and raises the noise floor in the power spectrum. In this letter, we propose a strategic decision method for parameter values in the heterodyne FMCW radar to achieve a low noise floor over the middle-long range. In addition, we experimentally discover the relation between the UPN and the processing gain for the first time. Based on this relation, we devise an exact formula for the degree of improvement achieved due to the proposed strategic decision method. Experimental results confirm the devised formula and show that the proposed method significantly reduces the noise floor over the middle-long range.
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