Extracting Method of Projectile Spin Speed based on Hilbert-Huang Transform

摘要

Making use of micro Doppler Effect measured by continuous wave radar (CW radar), the micro Doppler modulation mathematical model of radar echo cased by projectile rotation is established, and the analytic relationship between projectile rotation and micro motion is deduced. Based on Hilbert-Huang Transform (HHT), a new method of extracting spin speed is proposed to instead the traditional FFT method. Through the simulation, the new method is verified to be effective. This method is applied to extracting spin speed form the measured data, and its result is compared to the result calculated by FFT method. The result shows that the new method could effectively extract spin speed, and accurately describe the change of spin speed along with time.