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Simulation Study for Observation of Space Reentry Vehicles Based on UKF

Reliable observation of space reentry vehicles is an issue which is worthy of concerning and discussing undoubtedly. The ballistic missile is a typical space reentry vehicle, and it flights along a destined trajectory with a high speed and may maneuver. The motion of the ballistic mission can be approximated by the interaction of the basic motion models that have the simpler forms, and can be observed through using ground radars and optical sensors. After the approximate motion models and observations are brought into the framework of UKF who aims at nonlinear estimation problems specially, the estimate track of the ballistic missile can be implemented. This paper describes the motion model of the ballistic missile firstly, and then the measurement equations of the different sensors and the basic model of the motion body are given out, and then the algorithms of interacting multiple model and UKF are expatiated on, and finally the estimate track is achieved in a simulation system and a conclusion is drawn.