星载分布式SAR地面动目标精确聚焦的互谱MUSIC法

发布时间：2019-02-16 11:41

【摘要】：该文提出一种新的参数化聚焦算法,该算法采用互谱MUSIC(Cross Spectrum MUSIC,CSMUSIC)技术,能够在星载分布式SAR上得到精确聚焦的地面运动目标图像。首先,利用方位向回波信号的空时特性推导出扩展空时模型(Extended Space-Time Model,ESTM);根据该模型,提出一种基于子空间理论的参数估计方法,通过该方法能够精确地得到的动目标方位向速度,从而得到精确聚焦的图像,该方法比传统的星载SAR动目标聚焦方法具有更高的估计精度和更小的运算量。仿真实验将该方法与传统的动目标聚焦方法进行对比,以证明该文所提方法的上述优势。
[Abstract]:In this paper, a new parameterized focusing algorithm is proposed. The algorithm uses cross-spectral MUSIC (Cross Spectrum MUSIC,CSMUSIC (cross-spectral MUSIC (Cross Spectrum MUSIC,CSMUSIC) technology to obtain accurate focused ground moving target images on spaceborne distributed SAR. Firstly, the extended space-time model (Extended Space-Time Model,ESTM) is derived from the space-time characteristic of azimuth echo signal. According to the model, a parameter estimation method based on subspace theory is proposed, by which the azimuth velocity of moving target can be accurately obtained, and then the accurately focused image can be obtained. The proposed method has higher estimation accuracy and less computational complexity than the traditional spaceborne SAR dynamic target focusing method. The method is compared with the traditional moving target focusing method in order to prove the advantages of the proposed method.
【作者单位】：哈尔滨工业大学电子与信息工程学院;
【基金】：国家自然科学基金(61271343) 高等学校博士学科点专项科研基金(20122302110012)资助课题
【分类号】：TN957.52

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