Range-Doppler Imaging Algorithm for Multireceiver Synthetic Aperture Sonar
Traditional multireceiver Synthetic Aperture Sonar(SAS)imaging algorithms based on Phase Center Approximation(PCA)neglect the spatial variance of approximation error in the azimuth dimension.The distortion would be introduced in the focused results of distributed.To solve this problem,a two-way slant range considering the azimuth variance of approximation error is deduced based on the geometry models of transmitter/receiver bistatic sampling and PCA sampling.The system function in the 2D frequency domain is further decomposed into transmitter/receiver bistatic deformation term and quasi monostatic term.Based on that,the complex multiplication and interpolation are adopted to compensate the bistatic deformation term.Then,the range-Doppler imaging algorithm is used to focus the targets.Compared to traditional methods,much smaller appropriation error across the whole mapping swath is obtained by using the proposed method.Besides,the position deviation in the azimuth dimension is not introduced by the proposed method.The imaging result which is identical to practical target position can be obtained.
Multireceiver Synthetic Aperture Sonar(SAS)Phase Center Approximation(PCA)Azimuth spatial varianceRange-Doppler algorithm
万方数据
维普
