Non-uniform Extraction Equalization Algorithm for Sub-band Decomposition
In the case of serious channel mismatch of wideband digital array radars,a band-partition method has a better equaliza-tion effect than an inverse Fourier transform method.However,with a decomposition is incomplete,its reconstruction error is signifi-cant,and the required hardware resources are excessive.Aiming at the above problems,an extended bandwidth non-uniform extrac-tion equalization algorithm is proposed.This method sets the number of sub-bands to be divided,the position of stopband cutoff fre-quency is used to merge the sub-bands that do not participate in equalization.The non-uniform decimation is performed according to the frequency characteristics of the sub-bands to be equalized,and the equalization is performed within the sub-bands.After the equal-ization,each sub-band is interpolated and merged to complete the equalization process.Experimental results show that compared with the band-partition method,the proposed method increases the amplitude improvement factor and phase improvement factor by 5.39 dB and 7.48 dB,respectively,and reduces the computing complexity and occupation rate of hardware resources under the same equalized sub-bands and reconstruction error.
wideband digital array radarchannel mismatchsub-band decompositionnon-uniform decimation
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