电讯技术2024，Vol.64Issue(1)：51-57,7.DOI:10.20079/j.issn.1001-893x.220724002
改进的NLCS星弹双基SAR俯冲前视成像算法
A Spaceborne-missile Bistatic SAR Diving Forward-looking Imaging Algorithm Based on Modified Nonlinear Chirp Scaling
摘要
Abstract
In diving stage,due to the acceleration of the missile,the amplitude and direction of velocity change sharply and the slant range becomes complicated,which leads to serious range-azimuth coupling and the space variance of Doppler phase.If the azimuth focusing compression is carried out directly,the image must be distorted.To address these two challenges,a modified Nonlinear Chirp Scaling(NLCS)algorithm is applied to the new spaceborne-missile bistatic system model.Firstly,the spaceborne-missile bistatic system model is established.Then,a two-dimensional(2D)spectral expression is derived by using the method of series reversion.In the 2D frequency domain,the effects of range-azimuth coupling are eliminated by completing range compression and migration correction,and the modified NLCS algorithm is used to compensate the azimuth frequency modulation rate to solve the space variance of Doppler phase problem,complete azimuthal compression focusing,and get good imaging results.Compared with the improved Range Doppler(RD)algorithm,the proposed algorithm reduces 1.013×108 floating point operations per second(FLOPS),the azimuthal focusing effect of edge points has been greatly improved,and the peak sidelobe ratio(PSLR),integrated sidelobe ratio(ISLR),and resolution are improved by 2.41 dB,1.29 dB,and 1.16 m,respectively,which proves the effectiveness and feasibility of the proposed method.关键词
星弹双基SAR/前视成像/非线性变标算法/级数反演Key words
spaceborne-missile bistatic SAR/forward-looking imaging/nonlinear chirp scaling algorithm/series reversion分类
信息技术与安全科学引用本文复制引用
席子瑞,段崇棣,左伟华,李财品,李东涛..改进的NLCS星弹双基SAR俯冲前视成像算法[J].电讯技术,2024,64(1):51-57,7.基金项目
国家级项目基金 （）
