A method for nonlinearity correction of wideband FMCW radar

The nonlinearity in the transmitted signal of the Frequency-modulated continuous-wave (FMCW) radar has become a bottleneck to its utilization. This paper presents a new method to conduct nonlinearity correction for wideband FMCW radars. The nonlinearity is first modeled as a polynomial phase function, whose coefficients are then estimated with the proposed polynomial regression algorithm (PRA). Combined with the Match Fourier Transform, the nonlinearity is finally corrected. Simulation results show the feasibility of the proposed algorithm. Echo processing result of an X-band FMCW radar indicates that the nonlinearity can be eliminated effectively. SAR images further validate the effectiveness of the proposed algorithm.