An algorithm to acquire the average height of land surface

For an airborne altimeter, an algorithm to acquire the average height of the land surface is suggested based on the return waveform. Through the origin analysis about each point of return, scattering from assured distance reflects the corresponding information of incident scope. In the difficult situation of how to decide the single characteristic point, the technique built in the theory can be handled easily in practice. Otherwise, we validate our model by simulation in a good way.