Satellite laser altimeter can not only accurately measure the surface elevation of target, but also carry characters of target
surface on its return waveform. The return signals interacted by coastal zones and transmitted signal are simulated in this
paper, large number of return signal waveforms of Geoscience Laser Altimeter System are analyzed, and the change
rules of return signal waveforms of coastal zones relative to sea surface are concluded, which are peak decreasing, pulse
width widening, and mostly bimodal pattern. It is concluded that extracting coastline and locating the deserted island are
feasible with this method of analyzing return waveforms of laser altimeter.
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