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美国国家宇航局、加拿大遥感中心自下70年代以来,一直在研制激光遥感器,近年来已取得了一些重大的进展,如研制出激光测深仪、激光荧光传感器、激光雷达、海洋里达等.R.M.Measures建议将激光遥感器统称为里达(Lidar:Light DetectionAnd Ranging),为“光学检测及测距”之意.激光遥感为主动遥感方式.它从空间传感器向地表或海面发射激光脉冲,同时接收从目标物返回的散射波束,经接收透镜的光学处理(光谱分析及图象检测)和数据处理后.记录在9-道磁带上(数字的或模拟的).用于遥感的激光波长可从紫外段到近红外波段,其主要光谱特征是脉冲具有高峰能量.工作波段极窄(单色光).脉冲宽度极短,传播方向性极好(光束发散度低)等.故激光遥感数据的应用都是定量的.
NASA and the Canadian Remote Sensing Center have been developing laser remote sensors since the late 1970s and have made some significant progress in recent years, such as the development of laser sounder, laser fluorescence sensor, laser radar, marine radar, etc. .RMMeasures recommends that the laser remote sensor be collectively referred to as LIDAR (Light DetectionAnd Ranging), for the “optical detection and ranging.” Laser remote sensing is the active remote sensing method.It emits laser pulses from the space sensor to the surface or the sea, Simultaneous reception of the scattered beam returning from the target after optical processing (spectral analysis and image detection) and data processing of the receiving lens Recorded on 9-track tape (digital or analog) Laser wavelength for remote sensing From the ultraviolet to the near infrared band, the main spectral characteristics of the pulse is the peak energy, the working band is very narrow (monochromatic light), the pulse width is extremely short, the propagation direction is excellent (beam divergence is low), so the laser remote sensing The application of data is quantitative.