Abstract
Precession is a typical micromotion of a ballistic missile warhead in the middle of the trajectory. The modulation of the narrow-band radar echo by the precession warhead is mainly reflected in the micro-Doppler effect, which is manifested as the Doppler frequency of the echo periodically changing with time. In the article, an estimation method of precession parameters for warhead with fins using time-frequency analysis and dual radars is proposed. The estimated parameters include precession angle, spinning angular velocity, and coning angular velocity. The geometric and signal model of the precession warhead are established and the analytical expression of the Doppler frequency is deduced. Then, the precession parameters are obtained using the dual view angles of dual radars in this article. Simulation experimental results illustrate the effectiveness of the proposed method.
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