双头弹多普勒测速研究

Doppler Velocity Measurement of Duplex Ammunition

大口径机枪双头弹是机枪的辅用弹种，含有２ 个弹头，一般区截测速装置难以同时测量２ 个弹头的速度。提出一种采用多普勒测速雷达实现两目标测速的实验方法，介绍多普勒测试与数据处理原理，完成双头弹多普勒测速实验，获得了双头弹速度－ 时间关系曲线，并计算２ 个弹头各自的初速和阻力系数。实验结果表明，双头弹２ 个弹头在膛口就存在较大的速度差，２ 个弹头的速度—时间关系曲线规律基本一致。

Large caliber machinegun duplex ammunition is a kind of auxiliary cartridge of machinegun cartridge. Because it consists of two bullets, sensing device can′t be used to measure velocities of two bullets at the same time. A test method for obtaining duplex ammunition′s velocity using Doppler radar is presented. Doppler measurement and data processing principles have been introduced. The measurement has been carried out to achieve velocity time relation curves of the duplex ammunition, and therefore the initial velocities and drag coefficients of the two bullets of the duplex ammunition have been calculated. The test results proved that there is a fairly fixed velocity difference between the two bullets,and the pattern of the velocity time of the two bullets is mainly identical. The results are reliable for study of large caliber machinegun duplex ammunition.