Aircraft intelligent trajectory reconstruction reentry guidance method

Abstract

The invention discloses an aircraft intelligent trajectory reconstruction reentry guidance method, which comprises the steps of generating an offline reference trajectory by adopting a numerical optimization method according to an aircraft reentry initial state and various constraint conditions; setting waypoints, and calculating corresponding reachable domains; setting five normalization parameters to establish a relationship between an optimal track and a roll angle through the change characteristic of the roll angle of the optimal track, proposing an optimization method for solving the corresponding roll angle parameter by using a search algorithm, then selecting sample data points in an accessible domain, calculating training data offline, and carrying out training based on a BP neuralnetwork; tracking a reference trajectory by adopting a guidance method; when reaching the height of the waypoint, generating a new track by using the trained neural network model; and completing trajectory reconstruction, tracking a new trajectory by the aircraft, and continuing to complete reentry guidance. According to the method, the calculation time of trajectory reconstruction is greatly shortened, and the influence of optimization time on guidance performance is reduced, so that the guidance precision of the reentry vehicle in the reentry stage is further improved.

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...

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Problems solved by technology

However, the pseudospectral method uses global polynomials for interpolation, and the interpolation error is difficult to co

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