A new parallel subaperture algorithm for high resolution SAR imaging

Xiao Liu; Yi-ming Pi; Chuan-hang Leng

doi:10.1117/12.737023

15 October 2007 A new parallel subaperture algorithm for high resolution SAR imaging

Xiao Liu, Yi-ming Pi, Chuan-hang Leng

Author Affiliations +

Proceedings Volume 6746, SAR Image Analysis, Modeling, and Techniques IX; 67460M (2007) https://doi.org/10.1117/12.737023
Event: SPIE Remote Sensing, 2007, Florence, Italy

Abstract

Both real-time rate and resolution both are key indexes of Synthetic Aperture Radar(SAR)imaging, but there is a conflict between them. Real-time imaging becomes difficult because of the large computational requirement posed by high-resolution processing. Parallel computing is an effective approach for real-time processing. In previous research, coarse and medium grained parallel algorithms for SAR imaging have been presented. Although they can significantly improve the processing speed, the quality of image has been ignored. Subaperture is widely used in high-resolution SAR. Compared with full aperture processing, it can compensate the motion errors more accurately and get better images. Whereas, subaperture processing can't be applied in existing parallel imaging algorithms because of they are all based on full aperture processing, which restricts the application of existing algorithms in high-resolution SAR parallel imaging. This paper presents a parallel imaging algorithm for high-resolution SAR, through which we can obtain high-resolution SAR image while achieving good computation efficiency. It combines chirp-scaling algorithm with subaperture processing. The new algorithm can highly effectively run on parallel computer, in which each node has the same load. It reduces the large communication requirement posed by three transposes through designing CS processing for subaperture data, and it has better parallel scalability, which means that it can be used on larger parallel computer without deducing the image quality. The experiments on SGI Origin2000 have proved that, compared with medium grained parallel CS algorithm, the algorithm presented in this paper is more suitable for high-resolution SAR parallel imaging.

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Xiao Liu, Yi-ming Pi, and Chuan-hang Leng "A new parallel subaperture algorithm for high resolution SAR imaging", Proc. SPIE 6746, SAR Image Analysis, Modeling, and Techniques IX, 67460M (15 October 2007); https://doi.org/10.1117/12.737023

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KEYWORDS

Synthetic aperture radar

Image processing

Image quality

Data communications

Data processing

Image resolution

Telecommunications

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