在弹道末端，由于弹道降与弹丸散布的存在，用雷达和天幕靶测速装置测试弹丸飞行速度误差很大。
For the fall of trajectory and the scatter of projectiles, there is larger error between the true value and the measured data by radar or Sky Screens.
进口码表、计量准确 ◆ 可加装散布进布架或加装摆幅装置，自动松布；
With code meter, accurate measurement; Bulk fabric feeding frame or amplitude device can be installed, automatically loosen fabric;
本文研究了火箭弹自身缺陷的随机性。提出了通过合理设计发射装置一阶固有频率，克服火箭弹自身缺陷对落点散布的影响。
The paper studies the random question of rocket self-defect, puts forward a new method of reducing the effect of rocket dispersion by designing equitably the first nature frequency of launcher.
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