A Method of Initial Velocity Measurement for Rocket Projectile

Abstract

In this paper, a novel method is proposed to measure the initial velocity of the rocket based on STFT (the short-time Fourier transform) and the WT (wavelet transform). The radar echo signal processing procedure involves the following steps: sampling process, overlapping windows, wavelet decomposition and reconstruction, computing FFT (Fast Fourier Transform) and spectrum analysis, power spectrum peak detection. Then, according to the peak of the detection power spectrum, the corresponding Doppler frequency is obtained. Finally, on the basis of the relationship between Doppler frequency and instantaneous velocity, the V-T curve is drawn in MATLAB to obtain the initial velocity of the rocket muzzle.