A Method of Acquiring the Guidance Law of Rlv Approach and Landing Based on the Idea of ​​Disturbance Compensation

Abstract

A disturbance compensation based RLV (reusable launch vehicle) approach landing guidance law acquisition method includes: firstly, calculating a height deviation and a lateral distance deviation according to an RLV approach landing nominal trajectory; secondly, using the Lyapunov theorem to obtain an anticipated flight path angle and a direction angle, namely virtual control laws according to a tracking deviation of the nominal trajectory; finally, adopting a backstepping design method to provide a guidance acquisition method capable of guaranteeing stability of a guidance loop. In a design process, an uncertainty upper bound of the guidance loop is obtained by analysis of aerodynamic data and inhibited by introduction of a compensation term, and consequently a guiding system has asymptotic stability in uncertainty of disturbance and the like. By adoption of the disturbance compensation based RLV approach landing guidance law acquisition method, influences of uncertainty on the RLV guiding system can be effectively overcome, and accordingly guiding precision is improved.

Description

technical field [0001] The invention relates to a landing guidance law acquisition method of a reusable vehicle (RLV). Background technique [0002] Reusable launch vehicles (RLV) are space shuttle vehicles that combine the features and functions of spacecraft and aircraft. They can stay in orbit to complete various space tasks, and can also return safely and accurately like an airplane. ground. Due to its reusable characteristics, RLV will become a highly reliable carrier for human beings to explore the universe at a low cost and a military weapon for competing for space supremacy. Therefore, the major powers in the world continue to invest huge resources in its research and development, and conduct new research and exploration. [0003] The return and re-entry phase of the RLV is usually divided into the initial re-entry phase, the terminal energy management phase, and the approach and landing phase. Go-around capability, if the guidance or control method is unstable or...

AI Technical Summary

Problems solved by technology

[0003] The return and re-entry phase of the RLV is usually divided into the initial re-entry phase, the terminal energy management phase, and the approach and landing phase. Go-around capability, if the guidance or control method is unstable or cannot meet the accuracy requirements, it may cause the RLV to fail to land safely, and even lead to catastrophic consequences

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