Intelligent trajectory reconstruction re-entry guidance method for aircraft

Abstract

The invention discloses an aircraft intelligent trajectory reconfiguration re-entry guidance method, which includes generating an offline reference trajectory by using a numerical optimization method according to the aircraft re-entry initial state and various constraint conditions; setting waypoints, and calculating corresponding reachable domains; According to the characteristics of the roll angle change of the optimal trajectory, five normalization parameters are set to establish the relationship between the optimal trajectory and the roll angle, and an optimization method is proposed to solve the corresponding roll angle parameters by using the search algorithm, and then select sample data points in the reachable region, Offline calculation of training data and training based on BP neural network; use the guidance method to track the reference trajectory; when reaching the height of the waypoint, use the trained neural network model to generate a new trajectory; complete trajectory reconstruction, the aircraft tracks the new trajectory, and continues to complete Reentry guidance. The method of the invention greatly reduces the calculation time of trajectory reconstruction and reduces the influence of optimization time on guidance performance, so as to further improve the guidance precision of the reentry vehicle in the reentry section.

Description

technical field [0001] The invention relates to the technical field of aircraft guidance, in particular to an aircraft intelligent trajectory reconfiguration re-entry guidance method. Background technique [0002] Aircraft reentry refers to the process that aircraft including returnable satellites, spacecraft, aerospace vehicles and hypersonic vehicles complete their scheduled space missions, enter the atmosphere through braking, and land safely on the ground. With the continuous progress and development of aerospace technology, the world's technological powers have put forward higher requirements for the guidance accuracy of aircraft reentry and return in order to cope with fierce competition. Therefore, the research on the guidance method of the reentry phase of the aircraft has important practical value and strategic significance. [0003] At present, the guidance methods of the reentry stage of the reentry vehicle are generally divided into reference trajectory guidance...

AI Technical Summary

Problems solved by technology

However, the pseudospectral method uses global polynomials for interpolation, and the interpolation error is difficult to control, and the grid points in the entire interval become denser at the same time, which increases the burden of optimization

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