Helicopter recognizing process, involves effecting time-frequency analysis by transformation of back scattered radar signal to wavelet to detect reflection of main rotor blades in time-frequency space

摘要

The process involves effecting time-frequency analysis by transformation of back scattered radar signal to wavelet to detect reflection of main rotor blades in a time-frequency space. An image obtained in the time-frequency space is analyzed in a long term. The number of the blades as well as speed of rotation of the rotor is estimated.