The method research of Envisat-1 ASAR data preprocessing includes radiometric calibration, geometrical correction and speckle reduction.

主要的研究内容如下：(1)ASAR数据预处理方法研究，包括辐射定标、几何校正和斑点噪声的去除。

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The images above were acquired by the Advanced Synthetic Aperture Radar (ASAR) on the European Space Agency's Envisat satellite on March 11 and 16, 2011.

上面两幅图是欧洲空间组织环境卫星的先进合成孔径雷达(ASAR)于2011年3月11日和16日拍摄的照片。

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ERS-1 and Envisat both suffered major failures that left them drifting uncontrolled through LEO.

BBC: 'Urgent need' to remove space debris

The measurements were recorded via a radar altimeter onboard the European Space Agency's (Esa) Envisat satellite.

BBC: Arctic ice thickness 'plummets'

The agency's Envisat satellite shows part of the Larsen Ice Shelf, which lies on a peninsula south of Chile, has decreased from 3, 463 square kilometers (1, 337 square miles) in March 2002 to 1, 670 square kilometers (645 square miles) today, a change the European Space Agency blames on warmer temperatures.

CNN: Satellite documents thinning ice shelf