基于双轴加速度传感器的外弹道转速实时测量方法

Real Time Detection Technique for Calculating Angular Velocity of Spinning Projectile in Exterior Trajectory Based on Two-axis Accelerometer

旋转弹外弹道自转角速度的实时测量是弹道修正引信弹道解算器设计的重要环节之一。弹丸转速基本检测方法是利用转速传感器,通过外测或遥测进行,尚无法对每发弹进行实时测量。提出了一种测量旋转弹外弹道自转角速度的方法。即利用双轴加速度传感器提取弹丸外弹道横向加速度采样信号的功率谱,结合DSP的数字滤波,对信号做256点FFT处理,得到一组-ωt的离散序列值。试验结果与理论分析相吻合,且能满足弹上解算的实时性要求。

Real-time calculating projectile＇s angular velocity in the outer trajectory is an important part of trajectory resolver design in the trajectory correction fuze. The basic method of the detection is outside measure or telemetering by rotation speed sensor, which can＇t measure every projectile to supply real time data for DSP. The new method of measuring angular velocity of spinning projectile in exterior trajectory was proposed. It is the principle of the new method that the power spectrum of cross accel- eration sample signal is extracted by two-axis accelerometer, a stries of discrete ω-t are obtained by combining FIR filter aria FFT. The tested results can consist with theoretical analysis and meet the need for projectile-borne fuze resolving angular velocity in real-time.