Range performance analysis in linear FMCW radar

Abstract

From the ambiguity function of the linear FMCW signal, the general effects of the frequency sweep nonlinearity on the range performance are discussed. Based on the criteria of determining the Carson bandwidth, an approximate relationship among the range resolution, the target range delay and the mean square root of the nonlinear frequency errors is presented at small phase modulation index. Then the problems of the self-clutter interference in this radar are also described, and an estimation expression of the self-clutter to signal ratio is given. Finally, the measured data of nonlinear frequency errors are utilized for the simulation and comparison of the range performance in this radar.