A New Approach for SAR Baseband Doppler Centroid Estimation

摘要：

　　In synthetic aperture radar(SAR),many of the biased baseband Doppler centroid estimates are caused by partial exposures of bright targets.To avoid this problem,this paper proposes a new estimation algorithm to remove the effects of partial exposures under non-homogeneous environment.This algorithm is implemented by three steps.Firstly,concentrate the energy of each target into a few pixels through azimuthal compression using frequency domain matched filter.Then,extract the homogeneous environment through the spectral distortion and contrast,and eliminate the strong interference target.Finally,estimate the centroid of the averaged extracted power spectrum using a circular convolution method.Theoretical analysis and experimental results show that the proposed method can effectively eliminate the interference targets and accurately find the Doppler centroid under non-homogeneous environment with strong interference.Moreover,the operations of the proposed algorithm need no iterations,thus the computational load is greatly reduced compared with the traditional iterative methods.

关键词： Baseband Doppler centroid estimation partial exposures of bright targets synthetic aperture radar frequency domain matched filter

作者: Bidan Liu Chang Liu Yanfei Wang

作者单位: Institute of Electronics,Chinese Academy of Science,19 North Sihuan Road,Haidian,Beijing 100190,China

会议类型: 国内会议

会议名称: 全球智能工业创新大会暨全球创新技术成果转移大会(GIIC2018)——2018智能无人系统大会

会议地点: 北京

会议语种:英文

页码: 1-7

在线出版日期: 2018-05-22（万方平台首次上网日期，不代表论文的发表时间）