The paper introduces a kind of sonic method by which frequency of impacter is measured.
介绍了一种声波法测冲击器频率的方法。
The result of analogue test shows that frequency of impacter measured by sonic method consists with actual frequency and the method is feasible.
模拟试验结论表明，声波法测出的冲击频率与实际频率是一致的，具有可行性。
Of all the factors influencing sonic booms, increasing altitude is the most effective method of reducing sonic boom intensity.
在所有影响音爆的因素中，提高飞行高度是减弱音爆的最有效措施。
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