Nonlinearity correction for range estimation in FMCW millimeter-wave automotive radar

In this paper, we propose a computational correction algorithm to reduce the effect of source nonlinearity on range estimation for millimeter-wave frequency modulated continuous wave (FMCW) automotive radars. With a transient parametric modeling on the source nonlinearity function, the proposed algorithm aims to jointly estimate range parameters from multiple reflectors and parametric nonlinearity coefficients from the beat signal, without using a reference (either a dedicated delay line or a reflector at a known distance). Numerical results are provided to validate the effectiveness of the proposed algorithm.