Abstract:  The discrimination of warhead and decoys is one of the main technological bottlenecks in ballistic missile defense system, which means the success or failure of the anti-missile system to some extent. Micro-motion is commonly referred to small mechanical vibrations or rotation in addition to mass translation which may induce additional frequency modulation on the received target echoed signal, called micro-Doppler effect. The characteristicof micro-motion is academically considered as one of the most effective characteristics in ballistic midcourse target recognition.The extraction of the micro-motion characteristics offers new measures for target recognition in ballistic missile defense. And in the many recognition methods, the one based on the micro-motion plays the most important part.Using target micro-motion characteristics for target detection and recognition is a hot topic in radar community recently. This paper objects at the midcourse rotational symmetrical cone-shaped target. In this paper, under the background of missile confrontation, the location and model of echo of the two scattering centers on the target are derived and the model of precession of cone-shaped target with sliding scattering center is constructed according to the scattering center theory. The explicit relationship among the structure parameters and the micro-Doppler parameters is analyzed and then the analytical expressions of micro-Doppler are derived. The timefrequency distribution-Hough(TFD)transformationis a commonly used method for the parametric estimation of frequency modulated signal, its core being the accurate signal modeling and to design the algorithm of extracting the time-frequency curve according to the frequency changes of signal.In the paper, the parametric estimation method by using the tool of TFD-Hough transformation is studied. Then a joint parameter estimation method based on TFD-Hough Transform is proposed, under which precession and structural parameters are estimated according to the synthesized micro-Doppler parameters of two scattering centers and joint solutions of their parameter space. Simulation results show that the time-frequency curves of micro-Doppler echo coincide with the analytical expression.The joint parameter estimation method introduced can be referred to accurate estimation of precession and structural parameters such as precession angle, precession frequency, cone height, conical bottom radius, etc.