Abstract: Aiming at the complexity and multi-phase process of the trajectory of target complex formed by ballistic missile in space, a phased modeling approach is proposed. Due to the differences of the motion characteristics at different phases, based on the phased modeling thought, the release model of coast decoy in symmetric release structure is established under the corresponding coordinate systems. Under the consideration of several factors: the number, mass, initial state, and vanishing condition, the generation process of multiple batches of boost debris trajectories is designed. The main target trajectory of ballistic missile, decoys release process and multiple batches of debris trajectories in Earth-centered Earth-fixed (ECEF) coordinate system are simulated. Simulation results show the approach can approximate the reality under the condition of the proper parameters.

Key words: target complex trajectory, motion characteristics, phased modeling, decoy release, debris modeling