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機載激光測深儀實際上是一種激光測深雷達,它可裝在飛機上測量海水、河水或湖水等的深度,繪製海圖、測繪内河、湖泊航道等。這種激光雷達一般採用倍頻摻釹釔鋁石榴石(Nd:YAG)為激光器,這種石榴石可同時向海面發射紅外光和綠色光,紅外光從海表面反射回來,綠色光可穿透海水從海底反射回來,裝在飛機上的激光接收機可檢測這兩種光反射回來的脈衝信號,測量出這兩個短脈衝從海表面和從海底先後返回的時間間隔就可測量出水深。每次激光測深的精確定位都與飛機飛行位置、高度、姿態信息、激光束出射角等參數有關。飛機位置可以由地面
Airborne laser sounder is actually a laser sounding radar, which can be installed on the plane to measure seawater, river or lake depth, drawing charts, surveying the river, lakes and so on. This laser radar generally uses frequency doubling neodymium-doped yttrium aluminum garnet (Nd: YAG) laser, the garnet can simultaneously emit infrared light and green light to the sea, infrared light reflected from the sea surface, the green light can penetrate Seawater is reflected back from the seabed and the laser receiver mounted on the aircraft detects the pulse signals reflected by the two lights and measures the depth of the two short pulses from the sea surface and from the sea floor back and forth. The accurate location of each laser sounding is related to the parameters such as the flight position, altitude, attitude information and laser beam exit angle. Aircraft position can be by the ground