Root-MUSIC Based Power Estimation Method with Super-Resolution FMCW Radar
This paper proposes a method for estimating the reflection power with high accuracy while estimating the target position beyond the Rayleigh limit with FMCW radar. Although eigenvalue decomposition methods such as MUSIC have been studied to achieve high resolution in localization, their estimated pseudo power spectrum is not related to the actual signal intensity. In this method, root-MUSIC is used to obtain the multiple frequencies included in the received signal, and then the least squares method is sequentially applied to calculate the complex amplitude corresponding to each obtained frequency. The reflection intensity of each frequency can be calculated as the power of the absolute value of its complex amplitude. An experiment using different size scatters is conducted and shows that the proposed method can estimate the power of the signal from each target while estimating the distance beyond the Rayleigh limit.