采用多段样条技术从雷达遥测数据中提取弹丸阻力系数

Multi-SPline Technique for the Extraction of Drag Coeffidents from Radar Data

在射表准备中用射击试验时雷达遥测的数据提取弹丸阻力曲线非常重要．尽管已提出多种方法，但都不完全令人满意．本文提出采用多段样条来提取阻力曲线．此法能保证曲线的一阶连续性，且能从亚音速到超音速高精度地拟合出阻力曲线．实际射击试验显示了此法的快速收敛性及高精度．典型的速度拟会均方差为００５—０．０８ｍ／ｓ．

In the preparation of firing tables, the determination of projectile drag coefficientsthrough firing test radar data reduction is very important. Many methods have been developed for this work but none of them appear to be satisfactory in one Way or another. Inthis paper a multi-spline model of drag coefficient (cd) curve is developed that can guaranteefirst derivative continuity of the cd curve and has good flexibility of fitting accurately to acd curve from subsonic up to supersonic range. Practical firing data reduction tests showboth fast convergence and accurate fitting results. Typical velocity fitting RMS errors are0.05-0.08 m/s.