Advantages and Challenges of FMCW Radar Imaging with Shifting Sub-Bands

High-resolution imaging is an ever-popular research topic in the radar community. However, achieving higher resolution generally necessitates larger bandwidths, posing significant engineering challenges. To overcome these challenges, synthesizing a large bandwidth using shifting sub-bands across different center frequencies has emerged as a promising technique. This study explores the advantages and challenges of frequency modulated continuous wave (FMCW) radar imaging with shifting sub-bands. Methods to compensate for phase errors have been investigated to synthesize baseband signal. The imaging performance has been evaluated through both simulations and outdoor experiments using universal software radio peripheral (USRP) X410.