摘要
为得到弹丸在膛内运动的摆动情况,该文提出一种通过微波干涉仪获取弹丸在膛内的微运动姿态相关信息的测试方法。首先建立线膛炮内弹丸微运动产生的多普勒模型,在模型的基础上利用短时傅里叶变换获取弹丸在膛内纵向运动的变换规律,再利用Hilbert-Huang变换获得详细的微多普勒信息,最后应用小波变换得到弹丸在膛内摆动的幅度和频率。研究表明:通过结合3种时频变换方法,能定量得到弹丸在膛内的摆动特征,且摆动频率误差在1 kHz范围以内;与不同组的实验数据对比,可以判断火炮身管内的不平衡程度。
In order to obtain the swing of the projectile moving in the orbit, this paper proposes a test method for obtaining micro-motion attitude related information of the projectile in the orbit through a microwave interferometer. Firstly, the Doppler model generated by the micro-movement of the projectile inside the wire barrel is established. The short-time Fourier transform is used to obtain the transformation law of the longitudinal motion of the projectile in the orbit, and then the Hilbert-Huang transform is used to obtain the detailed micro Doppler information. Finally, applying the wavelet transform to get the amplitude and frequency of the projectile's swing in the jaw. The research shows that by combining three kinds of timefrequency transformation methods, the swing characteristics of the projectile can be quantified, and the wobble frequency error is within 1 kHz. Compared with the experimental data of different groups, the degree of imbalance in the gun barrel can also be judged.
引文
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