Improving Spatial Resolution Using Spaceborne Parasitic SAR

HE Feng; LIANG Dian-nong

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Improving Spatial Resolution Using Spaceborne Parasitic SAR

更新时间：2025-07-16

- Improving Spatial Resolution Using Spaceborne Parasitic SAR
- Acta Electronica Sinica Vol. 33, Issue 6, Pages: 1128-1131(2005)
- 作者机构：
  
  国防科技大学电子科学与工程学院,湖南,长沙,410073
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN957
- Published：2005
- 稿件说明：
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HE Feng, LIANG Dian-nong. Improving Spatial Resolution Using Spaceborne Parasitic SAR[J]. Acta Electronica Sinica, 2005, 33(6): 1128-1131.
DOI：

HE Feng, LIANG Dian-nong. Improving Spatial Resolution Using Spaceborne Parasitic SAR[J]. Acta Electronica Sinica, 2005, 33(6): 1128-1131. DOI：

摘要

星载寄生式SAR(Synthetic Aperture Radar)是分布式小卫星SAR的一种典型形式.本文用数学推导的方法

以统一的形式给出了提高距离和方位分辨率的原理公式

公式表明:提高距离和方位分辨率的原理能以二维地面散射谱在距离维和方位维的频谱偏移这一统一的观点来解释

进而可一并考虑并同时实现.基于此提出一种提高系统空间分辨率的实现方法

同时考虑了固定相位差和两个方向的频移

可直接合成多幅图像.实现中充分考虑了图像频域支撑区的规则分布问题

以保证获得时域高质量图像.仿真验证了该方法的有效性.

Abstract

Spaceborne parasitic SAR is a typical form of distributed small satellite system.With theoretical derivations

it's found that improving range and azimuth resolution by combination of several images from different small satellites can be explained uniformly by scattering spectrum two-dimension shifting

and improving range and azimuth resolution can be completed at the same time.A processing method is given to combine multiple images for improving spatial resolution of spaceborne parasitic SAR

which compensates spectrum shifts in two directions and fixed phase difference.Regularity of cover area in frequency domain after combination is considered to assure to get high quality images in spatial domain.Simulated data show that theoretical derivations are in good agreement with practice.

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