运用上述方法对光滑起伏模型和任意起伏模型进行了数值模拟试验。
The numerical modeling tests are carried out for smooth relief model and arbitrary relief model by using abovementioned methods.
介绍了雷达中频回波信号的设计原理，推导了不同波形种类的回波信号表达式，并为目标建立了4种截面积起伏模型。
The design principle of radar intermediate-frequency echo is introduced; different kinds of expression of echo signals are deduced, and 4 categories of wave of target cross section are modeled.
最近，数学模型显示拥堵的波动起伏是因为驾驶员的行为。
More recently, mathematical models have suggested they may actually be down to drivers' behaviour.
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