Title :
Nonlinearity Correction of FMCW SAR Based on Homomorphic Deconvolution
Author :
Jian Yang ; Chang Liu ; Yanfei Wang
Author_Institution :
Inst. of Electron., Beijing, China
Abstract :
In this letter, a novel algorithm based on homomorphic deconvolution is proposed to give a theoretically unbiased estimation of transmitted nonlinearity in the beat signal in frequency-modulated continuous-wave synthetic aperture radar. Transmitted and received nonlinearities in the beat signal are separated in the Cepstrum domain by using a controllable delay line, and the transmitted nonlinearity can be extracted by comb notch filter. Moreover, an integrated nonlinearity correction strategy with residual-video-phase removal is presented by combining with the proposed estimation algorithm. Extensive simulations are performed to validate the generality and the robustness of the proposed algorithm.
Keywords :
CW radar; FM radar; notch filters; synthetic aperture radar; Cepstrum domain; FMCW; SAR; beat signal; comb notch filter; controllable delay line; homomorphic deconvolution; nonlinearity correction; residual-video-phase removal; transmitted nonlinearity; unbiased estimation; Approximation algorithms; Cepstrum; Deconvolution; Delay effects; Estimation; Signal processing algorithms; Synthetic aperture radar; Frequency-modulated continuous wave (FMCW); homomorphic deconvolution; nonlinearity correction; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2012.2227667