雷达实测数据中弹丸阻力系数二元函数提取方法研究

针对高原射表编制问题,提出了随马赫数与海拔高度变化的弹丸阻力系数二元函数表达式和利用雷达测速曲线中提取阻力系数二元函数的方法.该方法以非均匀B样条函数作为拟合函数,使阻力系数的变化规律更接近真实情况.详细推导了提取二元阻力系数的具体算法,并提供了计算机程序框图.将对雷达实测数据进行处理得到的阻力系数用于弹道解算,与高原试验结果比较,在20°和50°射角下,传统方法与试验射程相差-1.30%和-2.28%,新方法相差-0.21%和-0.26%.按照新方法解算弹道,精度明显提高,该方法是实际可行的.

Method for Extraction of Two-variable Function of Projectile Drag Coefficient from Radar Measured Data

Aiming at the problem of the plateau firing table compilation, the expression of two-variable function of projectile drag coefficient varying with the mach number and altitude above sea level is presented in this paper. The method for the extraction of the two-variable function of projectile drag coefficient from radar data is also presented. The fitting function is the non-uniform B-spline, and the variety of projectile drag coefficient can be made closer to the actual situation. The computational technique for extraction of the two-variable function of projectile drag coefficient is derived and the computer program diagram is shown in the text. The projectile drag coefficient obtained by processing the radar measured data is used in a trajectory solver. The plateau firing result shows that under the firing angle of 20°and 50°, the differences of the calculation ranges of the traditional method and the experiment range are -1.30% and -2.28%, and those of the proposed method and the experiment range are -0.21% and -0.26%. By using the proposed method, the computational precision of trajectory of projectiles is improved. The illustration shows this method is feasible in practice.