A GNU radio based FMCW radar with a simple frequency correction technique for accurate indoor localization applications

Frequency modulated continuous wave (FMCW) radars have been widely used for measuring target range and speed. In this paper, we investigate and analyze its performances for indoor localization application. We develop a simple method to correct errors in finding beat frequency and present a two-step process to reduce background reflections from stationary objects. We use Matlab Simulink for simulations and employ USRP and GNU Radio platforms to construct a FMCW test setup. Both simulations and experimental results show the proposed method improve accuracy by 1.6 to 18 times over the conventional method.