Abstract:

To improve the tracking accuracy for the hypersonic gliding targets in the near space, a dual-channel parallel tracking algorithm is proposed. Firstly, the target’s ballistic trajectory is compared and analyzed. There are more significant changes in the motion parameters of angle domain compared to that of the position domain. In order to make tracking in the East North Up coordinate system, the inclination angle and azimuth angle are used instead of the flight path angle and velocity azimuth angle to establish the maneuvering models in the longitudinal and horizontal channels respectively. The change rate of the inclination angle and azimuth angle are all described as a zero-mean sinusoidal autocorrelation stochastic process. Then, the trajectory is decomposed into the longitudinal and horizontal planes. A three-dimensional tracking of the target is achieved through 〖JP3〗the measurement data preprocessing, dual-channel parallel filtering, and output state merging. Finally, the parameters of the two-channel maneuvering model in the algorithm are set through the simulation experiments, and the influence of the process noise on the tracking accuracy is analyzed. The simulation results show that, the algorithm has higher tracking accuracy compared with the existing near-space hypersonic target tracking algorithm.

Key words:  Near space, Hypersonic gliding target, Tracking, Inclination angle, Azimuth angle, Parallel