旋转弹丸采样信号的DSP实时滤波原理

The Prinsiple of DSP Real-time Filtering for Rotating Projectile Sampled Signal

旋转弹丸外弹道离心加速度采样信号包含有高频弹丸转速信息和空气阻力加速度低频分量,为了提取弹丸转速-时间序列值,需要实时滤除低频阻力加速度分量,设计了在DSP中实时实现的数字滤波器。结果表明:16阶线性相位型结构的FIR滤波器能在TMS320VC33系统上实现实时滤波,滤波时间为34.83μs,且能同时满足精度和速度的要求,并成功用于某旋转弹丸弹道修正引信的数字滤波器设计中。

Projectile＇s radial acceleration sample value in trajectory includes projectile＇s angular velocity information and air drag acceleration,to extract angular velocity-time series value, the design method of the FIR digital filter firstly uses Matlab to design and emulate, and then on the float-point of DSP digital filtering is realized. The result shows the high-pass filter of 16 step linearity phase type can implement the real-time filtering on TMS320VC33 system,the 16 step filtering time is 34. 83μs, which can satisfy precision and velocity simultaneously. It is applied to the trajectory correction fuze （TCF） of a certain rotating projectile successfully.