Millimeter-wave Interference In The Signal Processing In The Instrument Bore

Analyzing projectile motion parameters of bore is an important basis for weapons design to improve it, and the speed of information extraction has particular significance. Millimeter-wave interferometer using the Doppler Effect can be achieved for the effective extraction of velocity information, and millimeter-wave has excellent penetration properties towards smoke and other harsh environment.Conventional Millimeter-wave interferometer measuring projectile velocity estimation error is large on the very rapidly changing period. This paper presents a dual interference theory:calculated the instantaneous frequency of projectile velocity echo phase difference signal, take the method of time-frequency distribution and gets the speed-time curve by inverse transformation, bringing down the speed estimation error by an order of magnitude.In this paper, non-stationary signal processing method is briefly described. Using Choi-Williams distribution, reducing the cross-term distribution, Wigner-Ville distribution and its variant forms to process the instantaneous phase difference of the projectile echo signal. The distribution of time-frequency map obtained with the serious cross-term interference, this paper analysis the theory of suppress cross terms, combined with the handling characteristics of the polynomial phase signal, designed Wigner-Ville distribution of polynomials completely eliminate the cross-term interference. For the treatment of polynomial phase signals, from the speed estimation error, cross-term suppression, time-frequency concentration, and noise sensitivity, compare polynomial Wigner-Ville distribution to other time-frequency distribution, proved that polynomial Wigner-Ville distribution advantages.