As the basis of the tracking algorithm, an echo model is the key to radar altimeter design.
雷达高度计回波模型是设计、检验高度计跟踪算法的基础，是高度计设计的关键性环节。
Laser altimeter not only can precisely measure the target distance, but also extract characteristic information, such as inclination, roughness etc. from its echo signals. So they are applied widely.
激光测高仪不仅可以精确测量目标的距离，还能够从回波信号中提取倾斜度、粗糙度等特征信息，应用十分广泛。
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