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频率混叠在气体炮内弹道速度测量中的应用

DOI: 10.11858/gywlxb.2013.04.009, PP. 523-527

Keywords: 频率混叠,傅立叶变换,内弹道,速度测量

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Abstract:

从采样理论出发,分析频率混叠现象的产生规律及其在时域和频域中的表现形式,获得采样信号频率与原始信号频率的关系,论证了利用频率混叠规律恢复原始信号频率的可行性。采用数值方法模拟理想条件下的频率混叠信号,分析原始信号频率恢复方法。利用激光位移干涉仪和光束遮断法,开展了二级轻气炮内弹道速度的对比测量实验,根据频率混叠规律恢复干涉信号频率,得到的结果与光束遮断法测量结果一致,解决了内弹道长历程、高速测量中记录长度与采样率之间的矛盾。

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