The Research On Airborne Power-glider Closed Loop Guidance Law

Now, the countries in the world all promote the new military revolution, on the battlefield it appear armed atmospheric characteristics of integrated joint operations, how to fight and destroy enemy targets accurately, at the same time, as much as possible to reduce their own lives, reduce manpower inputs, this goes to the modern guidance laws of weapon.In recent years, precision guided munition has become more and more useful in some typical high technology war, from the gulf war, the precision-guided weapons was used by7.8%of total weapons in American, to35%of the kosovo war, and then to68%of the war in Iraq. This shows that precision-guided weapons has become the main battle weapon of the informationalized war, so many countries have explicitly put the precision-guided weapons as a key national development strategy. In this paper, it was based on this case,we do research on the surrounding closed-circuit guidance law of airborne power-gliding missile launches. The main job are as follows:1. This paper firstly expounds the current background and significance of guidance law, this paper introduces the theory of classical guidance laws and several kinds of guidance laws based on the modern control theory, and introduce the concept of closed loop guidance law, simply introduces the working principle diagram.2. In the second chapter, we introduce the four kinds of commonly used coordinate system in the missile flight mechanics, then discusses the relationship between the coordinate system and the transformation of the relationship between four coordinate system. Finally, to summarizes and analyze the effect on the missile and the moment of force, and do the preparation for the third chapter, the fourth chapter theoretical groundwork. The third chapter first introduces the development of the theory of fluid dynamics, and then according to the Reynolds-averaged Navier-Stokes equations, the standard model and six degrees of freedom dynamic equations. Using the user-defined functions of computational software in Fluent6.1(User-Defined Function, UDF) to do the unsteady flow field simulation calculation, the analysis show that airborne and missiles in the first separation, the flow field disturb near the interference is very severe by loading machine, after0.5seconds, the disturb flatter out, the ignition operation can be performed at this time. The fourth chapter designs a closed-circuit guidance law based on the parabola, we analyze the specific theory of the parabola closed-circuit guidance, finally, do the numerical simulation to the founded closed loop guidance law, we can obtain the guidance error is small, the results proves that the feasibility of the closed loop guidance law.