Micro-Doppler Features And Parameters Estimation Of Ballistic Mid-course Targets

In modern warfare, ballistic missile is the extremely powerful and widely used offensive weapons with long range, high speed and precision, strong survivability and mobility, high benefit-cost ratio, etc.With the characteristics of all-weather, all-time, long distance, and real-time, Radar plays a key role and is broadly used in all phases of ballistic missile defense system, such as early warning detection, track, identification, guidance, interception and destruction effects assessment, etc. Radar target recognition is an important research subject in the field of information processing.Under the new conditions of war, research and improved ballistic target identification method are becoming increasingly important whether to the enhancement of the international standing or to the national security defense of a country. 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.Taking ballistic missile attack and. defense combat as the background, micro-Doppler model, micro-Doppler parameter estimation, micro moving and physical feature extraction is the main line of the dissertation. Radar signal processing and feature extraction of micro-moving target are deeply studied with theoretical analyses and computing simulations. Scattering model of middle-course ballistic target is analyzed at first. A unified expression of micro-Doppler in the ideal scattering point condition——three-parameter sinusoidal FM signal is derived based on ideal theory of point scattering centers. Secondly, under the background of missile confrontation, midcourse target micro-Doppler model based on non-ideal scattering centers is introduced and the effect of sliding-type scattering center to micro-Doppler is studied. A parameter estimation method using TFD-Hough transform is proposed’ for micro-Doppler echo of ideal scattering centers in basic micro-movement. Finally, micro-Doppler parameter estimation of midcourse cone target based on non-ideal scattering centers is studied, on which analyses and simulations are also applied.