A novel approach for wide‐swath and high‐resolution SAR image generation from distributed small spaceborne SAR systems
A novel approach for wide‐swath and high‐resolution SAR image generation from distributed small spaceborne SAR systems
复制标题
DOI：
10.1080/01431160500117873
复制
发表时间：
2006-03
影响因子：
3.4
通讯作者：
Zhenfang Li;Z. Bao
中科院分区：
文献类型：
--
作者：
Zhenfang Li;Z. Bao
在本文中，我们研究的可能性，以产生高分辨率的合成孔径雷达（SAR）图像的大面积的数据收集的分布式小型星载SAR系统。特别是，我们专注于数据处理技术，克服多普勒模糊的影响，地面回波的特征，实现高分辨率的SAR图像的大面积。提出了一种新的方法，其核心思想是利用空时自适应处理（STAP）算法从接收到的地面回波中提取出方位向宽（全）谱信号，克服低脉冲重复频率（PRF）引起的多普勒混叠效应，然后利用常规的SAR数据处理工具对SAR图像进行全聚焦。基于STAP的方法具有简单、鲁棒和高效的优点。我们还讨论了阵列配置的要求，并给出了一个平台速度/重频阵列配置的标准。
In this paper we investigate the possibility to produce high‐resolution synthetic aperture radar (SAR) images of wide areas from the data collected by the distributed small spaceborne SAR systems. In particular, we focus on the data processing techniques for overcoming the Doppler ambiguity effects characterizing ground echoes and achieving high‐resolution SAR images of wide areas. A novel approach is proposed, the key idea of which is to retrieve the unambiguous azimuth wide (full) spectrum signal from the received ground echoes by using a space–time adaptive processing (STAP) algorithm to overcome the Doppler aliasing effect induced by the lower pulse repetition frequency (PRF); following this operation, conventional SAR data processing tools can be applied to fully focus the SAR images. The STAP‐based approach has the advantages of simplicity, robustness and high efficiency. We also discuss the array configuration requirements, and give a platform velocity/PRF criterion for array configurations.