A predictor-corrector entry guidance method satisfying the constraints of no-fly zone and waypoint is proposed in this paper. First, Gauss pseudospectral method is used to generate a reference trajectory. Based on the reference trajectory some reference points are selected which partition the entry process into several subsections. Then a predictor-corrector guidance law is developed. The trajectory prediction is realized by numerical integration and the corrector is based on fuzzy logic. In each subsection, one or two bank angle reversals are designed. The attack angle, the magnitude and reversal time of bank angle are cooperatively corrected to meet all constraints. The proposed method is robust and flexible while the longitudinal motion and lateral motion of the vehicle are synergistically controlled. The reference points are selected based on an optimal trajectory, so the method has the ability of optimization. A single bank angle reversal can satisfy the constraint of a no-fly zone or waypoint; therefore, the reversal times are few. Moreover, without iteration, there is only a single trajectory prediction in each guidance cycle, which is favorable for on-board calculation.
On-board entry guidance satisfying waypoint and no-fly zone constraints
01.07.2017
387069 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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