Abstract:

A novel approach for ballistic target discrimination based on H/α polarization target decomposition is addressed. Firstly, the definition and mathematical model of H/α target decomposition are introduced. Then the difference of micro-motion between real warheads and decoys, namely the movement of the warhead is more stable than decoys because of the attitude control, is described. On this basis, the method of extracting the feature, which is called time entropy and related with scattering randomness of ballistic target on the time dimension, is proposed. Then a fully-polarimetric radar echoes simulation procedure based on measurement data of warheads in the anechoic chamber, is intraduced. Thus, the radar echoes of warheads and decoys under different settings are gained so that the time entropy is then calculated. The experimental results show that the difference of the time entropy between the real warhead and decoy is obvious. The value of the time entropy is relevant with the target shape, but for the real warheads and decoys with the similar shape, the feature is valid. The proposed feature is also related with the data length (statistical window), however, when the data length is equivalent to the precession period, the value of the time entropy is stable.