Digitalize And Linearization Design For Oscillation Adaptive Autopilot

The oscillatory adaptive autopilot is flight control system of antiaircraft missile that imported in early 1980 s.Its design idea is exquisite, with the advantages of simple manufacture, convenient use and maintenance, but the self-excited oscillation needed by stable working of the system brings about aseries of adverse effects. In order to fully inherited its advantages and avoid its disadvantages, the digitalize and linearization design for oscillation adaptive autopilot is researched in this paper.First, according to the kinematics, dynamics theory of missile, under appropriate hypotheses, a mathematical model of the lateral loop of missile and rolling loop is established.Second, introduced the design principle and design features of the oscillatory adaptive autopilot.With the introduction of the Oscillation-Linearlize theory, the relay characteristics equivalent to avariable gain,and give the analytical method to the oscillation adaptive autopilot.Third, redesign the lateral loop based on the oscillation adaptive autopilot,and use structure filte to suppress the elastic vibration to avoid resonance due to missiles; Introduced the sliding mode variable structure control technique in the roll loop, and using continuous strategy on the relay characteristics,set the switch line(surface) of system into a neighborhood of it, to suppress the inherent chattering phenomenon within the ideal variable structure control system.Fourth, according to analysis the result of much calculated and the simulation to a large number of aerodynamically point,we find out a strong correlation between control parameters and the missile flight state parameters. We ultimately select T, V, Qv as the adjustable variables after repeated analysis and calculation, and fit a set of parameter adjustment rules with better control effect.Fifth, based on the completion of autopilot design, the performance requirements of sensitive element,actuator are put forward on, and we introduce the hardware and software Integration idea of autopilot,determine control algorithm and the sampling period. Finally we put forward the computer requirement in order to implement.