Working Paper Article Version 1 This version is not peer-reviewed

Low-Cost C-Band Fmcw Radar System Comprising Commercial Off-The-Shelf Components for Indoor Through-Wall Object Detection

Version 1 : Received: 12 October 2021 / Approved: 13 October 2021 / Online: 13 October 2021 (10:15:21 CEST)

How to cite: Jeong, H.; Kim, S. Low-Cost C-Band Fmcw Radar System Comprising Commercial Off-The-Shelf Components for Indoor Through-Wall Object Detection. Preprints 2021, 2021100191 Jeong, H.; Kim, S. Low-Cost C-Band Fmcw Radar System Comprising Commercial Off-The-Shelf Components for Indoor Through-Wall Object Detection. Preprints 2021, 2021100191

Abstract

This paper presents a low-cost C-band frequency-modulated continuous wave (FMCW) radar system for use in indoor through-wall metal detection. Indoor remote-sensing applications, such as through-wall detection and positioning, are essential for the comprehensive realization of the internet of things or super-connected societies. The proposed system comprises a two-stage radio-frequency power amplifier, a voltage-controlled oscillator, circuits for frequency modulation and system synchronization, a mixer, a 3-dB power divider, a low-noise amplifier, and two cylindrical horn antennas (Tx/Rx antennas). The antenna yields gain values in the 6.8 ~ 7.8 range when operating in the 5.83 ~ 5.94 GHz frequency band. The backscattered Tx signal is sampled at 4.5 kHz using the Arduino UNO analog-to-digital converter. Thereafter, the sampled signal is transferred to the MATLAB platform and analyzed using a customized FMCW radar algorithm. The proposed system is built using commercial off-the-shelf components, and it can detect targets within a 56.3 m radius in indoor environments. In this study, the system could successfully detected targets through a 4-cm-thick ply board with a measurement accuracy of less than 10 cm.

Keywords

FMCW radar system; remote sensing; Arduino; through-wall detection

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