Dual Channel S-Band Frequency Modulated Continuous Wave Through-Wall Radar Imaging

Abstract

This article deals with the development of a dual channel S-Band frequency-modulated continuous wave (FMCW) system for a through-the-wall imaging (TWRI) system. Most existing TWRI systems using FMCW were developed for synthetic aperture radar (SAR) which has many drawbacks such as the need for several antenna elements and movement of the system. Our implemented TWRI system comprises a transmitting antenna and two receiving antennas, resulting in a significant reduction of the number of antenna elements. Moreover, a proposed algorithm for range-angle-Doppler 3D estimation based on a 3D shift invariant structure is utilized in our implemented dual channel S-band FMCW TWRI system. Indoor and outdoor experiments were conducted to image the scene beyond a wall for water targets and person targets, respectively. The experimental results demonstrate that high-quality imaging can be achieved under both experimental scenarios.

Low-Complexity MUSIC-Based Direction-of-Arrival Detection Algorithm for Frequency-Modulated Continuous-Wave Vital Radar

“…whereȧ m is the coefficient excluding the range term,ȧ m =ã m exp(−j(2π f c τ m − µτ 2 m /2)) [20] and w(t) is the noise term, that is,…”

“…FOV and resolution are important factors in DOA estimation. The DOA resolution is denoted by θ ∆ , and it is calculated as [20,33]…”

“…For all simulations, the center frequency was set to 24 GHz, and the complex amplitude was independently and randomly generated from uniform distribution. The RMSE was calculated as follows [20]:…”

“…In FMCW radar systems, estimating the direction of arrival (DOA) is a major challenge due to limiting the number of arrays [20][21][22][23]. For DOA estimation, the fast Fourier transform (FFT)-based estimation method is most widely used in FMCW radar due to its low complexity.…”

Interaction Multipath in Through-the-Wall Radar Imaging Based on Compressive Sensing

“…Due to the potential of revealing targets behind an opaque obstacle, the technology of through-the-wall radar imaging (TWRI) has attracted much interest for public safety and defense applications [ 1 , 2 , 3 , 4 , 5 , 6 ]. TWRI is especially useful in behind-the-wall reconnaissance, law enforcement and various earthquake and avalanche rescue missions [ 7 , 8 , 9 , 10 ]. Existing research of TWRI aims at improving the quality of radar images.…”