| Citation: | ZHANG Rongsheng, CHEN Wanchun. Predictive guidance method of THAAD-ER interceptor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(4): 863-874. doi: 10.13700/j.bh.1001-5965.2018.0619(in Chinese)
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Based on public information, the model of THAAD-ER interceptor was established. Aimed at longer range, the high throw trajectory was planned, and a bunch of standard trajectories were produced. Predicted impact point iterated method is proposed, which contains solving time-to-go with analytic solution, seeking out the expected standard trajectory with polynomial fitting, and ascertaining the predictive impact point, and finally predictive guidance completes. Comparison is taken between predicted impact point iterated method and flight time iterated method, and it is easy to choose initial value with predicted impact point iterated method, and the program runtime decreases by 20%; standard trajectory files are not necessary during guidance process, which can save storage space of the computer on the interceptor. Large amount of simulations were carried out with different range and course shortcut, and the results show that interception range of THAAD-ER interceptor can reach 600 km, and the interception task can be completed with average miss distance less than 200 m when course shortcut remains. It has a good response to aerodynamic uncertainty.
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