Measurement And Tracking Technology Of Reentry Vehicle On Sea-based Platform

With the continuous exploitation and utilization of oceanic resource,measurement technique on sea-based platform has become a hot research field.Measurement and tracking of reentry vehicle on sea-based platform is vitally important not only in the field of missile defense system,but in the area of aerospace engineering.When target is located in a low altitude,the measurement always has a non-ignorable error as a result of multipath interference.Besides the direct reflection from the target,radar could receive other echo signals via the sea-surface.Under this circumstance,the conventional measurement of monopulse radar(using the real part of amplitude radio)will not represent the angle between the target and the boresight accurately.In this paper,C~2 algorithm is applied to process data from the sum and difference channels in order to extract the elevation angle.In some practical scenarios,C~2 algorithm may have an unsatisfied performance.The reason of the error in C~2 algorithm and the method of reducing the error will be discussed in this paper.The simulations will show the improvement of C~2 algorithm is feasible and effective in monopulse radar low-altitude measurement.On the basis of research on low-altitude measurement,the tracking problem of reentry vehicles is studied in this paper.With the analysis of force characteristics,the dynamic model of reentry vehicle is built and the motion trajectory is generated by simulation.Due to the strongly nonlinear dynamic model of reentry vehicle,several nonlinear filtering algorithms,like UKF,CKF,SR-HCKF and IMM-CKF,are studied in this paper.For the two scenarios of maneuvering target and non-maneuvering target,nonlinear filtering algorithm are compared by simulation and evaluated comprehensively.Combined with the measurement of C~2 algorithm,terminal phase of reentry vehicle with non-Gaussian measurement noise is studied in the end of this paper,verified by a simulation as well.