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1995年4月20日欧空局第二颗遥感卫星,ERS-2,发射升空,进入780km高的极轨道。ERS-2将同以前发射的ERS-1协同工作。ERS-1是1991年7月16日发射入轨的。两颗星协同工作,将使得该卫星的雷达高度计的测量点的数量增加一倍,从而使科学家能以极高的精度绘制地图。 协同工作还可以发挥合成孔径雷达(SAR)干涉测量的潜力。当连续通过同一轨道时可获得两个或更多个SAR图像。根据这些图像提供的相位差,可以得到地球表面地形的精确信息。
On 20 April 1995, the second remote sensing satellite, ERS-2, was launched by ESA into the polar orbit of 780 km high. The ERS-2 will work in conjunction with the previously launched ERS-1. ERS-1 was launched on July 16, 1991. Working together, the two stars will double the number of measurement points on the satellite’s radar altimeter, allowing scientists to map with great precision. Collaborative work can also exploit the potential of Synthetic Aperture Radar (SAR) interferometry. Two or more SAR images are available when passing through the same track in succession. Based on the phase differences provided by these images, accurate information on the terrain of the Earth’s surface can be obtained.