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前言有充分的实验证据证明,1.5~2.5μm段的遥感数据对农业、地质和水文研究很有用处。目前,卫星平台遥感用的是机械扫描器。航宇局的多光谱扫描仪和主题测绘仪便是典型的例子。但是,对分辨率的要求愈来愈高,用机械扫描器已很难满足需要。例如,为达到50 m的分辨率,扫描机构就需要以弧秒级精度进行操作,在卫星上进行长期工作时,这样做是极为困难的。机械扫描器体积大,驱动时需要相当大的功率,运动的机械系统亦有潜在的可靠性问题。另一途径是推帚式扫描。它在与飞行路线
Preface There is sufficient experimental evidence to prove that remote sensing data of 1.5 ~ 2.5μm segments are very useful for agricultural, geological and hydrological research. At present, the satellite platform uses a mechanical scanner for remote sensing. NASA's multispectral scanner and theme plotter are typical examples. However, the resolution requirements are getting higher and higher, with the mechanical scanner has been difficult to meet the needs. For example, in order to reach a resolution of 50 m, the scanning mechanism needs to operate with arc-second accuracy, which is extremely difficult to do on long-term operation on satellites. Mechanical scanners are bulky, require significant power when driven, and have potential reliability issues with moving mechanical systems. Another way is to push the broom scan. It's on the flight route