In this paper

a new method for equalizing the channel frequency response errors is presented based on the echo data in airborne radar.The method selects a pair of highly-correlated echoes from the reference and under-equalization channels

which are taken as the expected signal and the input signal of the equalizer

respectively.The wiener filter theory can then be used to estimate the coefficients of the equalizer.Theory analysis shows that the estimated equalizer approaches the practical mismatch errors in the situation that the clutter-to-noise ratio (CNR) is high enough.This method can equalize the mismatch of the transmission line and the receiver simultaneously

without refitting the radar equipments in use.Experimental results of a pair of measured data are given to demonstrate the validity of the proposed method.