Tail angle restraining guidance method based on sliding mode control

Abstract

The invention relates to a tail angle restraining guidance method based on sliding mode control, and belongs to the technical field of guidance. Firstly, a novel aircraft kinematics and dynamics model is built, then tail time is guided, distance between aircraft position coordinates and target position coordinates (xf, yf) is minimum, an expected tail end trajectory dip angle gamma f is a designed target, according to a back stepping method, a virtual control volume is designed to enable a sliding mode function and a differential coefficient to be simultaneously up to 0 in the tail time of flying, and according to Lyapunov method, trajectory dip angle change rate gamma' of an auxiliary control volume is obtained in a solving mode. The trajectory dip angle change rate is converted into an attack angle alpha, an aircraft novel model which is initially built is inputted, a track of the aircraft is adjusted in a real-time mode so as to meet an expected terminal condition, and therefore tail guidance is achieved. The method considers effect of aerodynamic characteristics of the aircraft on a guidance process, is more close to an actual condition, needs little information volume, and is wide in obtained trajectory dip angle tail value range, and smooth in obtained control volume change, and an attitude control system is easy to track.

Description

technical field [0001] The invention relates to a guidance method with end angle constraint based on sliding mode control, which belongs to the guidance technical field. Background technique [0002] In modern warfare, the combat environment is becoming more and more diverse, and the requirements for guidance laws are also getting higher and higher. Some special tasks require that the guidance law not only achieve the minimum amount of misses, but also expect to strike the target at a specific end angle. For example, it is hoped that the anti-tank missile can hit the front armor vertically, so as to maximize the damage; The adversary directly collides with the incoming missile, thereby destroying the combat warhead as much as possible; some anti-ship missiles hope to attack the ship from the side. Traditional guidance laws (such as proportional guidance) are widely used in actual combat systems because of their small information requirements. However, such guidance laws us...

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Problems solved by technology

[0006] constant projectile velocity), which in real cases will have a large impact on its result

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