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. 2021 Mar 10;21(6):1951. doi: 10.3390/s21061951

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Range and velocity estimation schemes. (a) linear frequency modulated continuous waveform (LFMCW) scheme [52], (b) Frequency Shift Keying (FSK) waveform scheme [67], and (c) Multiple Frequency Shift Keying (MFSK) waveform system [68].