Novel technique for reducing effects of non-linear frequency sweeps in LFM ranging radars

A new technique for overcoming VCO (Voltage Controlled Oscillator) non-linearity in FMCW (Frequency Modulated Continuous Wave) radar transceivers is presented. The proposed technique relies on correlating the output beat signal in the stretch processing technique with a pre-formed reference correlation signal that accounts for the VCO non-linearity. An overview of the FMCW radar is presented followed by a discussion of the VCO non-linearity problem with existing solutions. The proposed solution is demonstrated with supporting simulation results. The benefits of the proposed solution are stated with a suggestion of a possible simple realization.