Acquisition is defined as identification for a fixed target in the related field of sight (FOS), while tracking means the sway of the telescope's axis of sight (AOS). The automatic acquisition and tracking is a process in which the operating way of the telescope should be switched from guiding to automatic tracking. There are some kinds of method to improve the acquisition and tracking ability for fast moving targets: to extend the acquisition and tracking FOS with memory and storage information of the sensor system; the multimode control to improve the dynamic property of the servo system; to choose an opportune time for acquisition and tracking; to select the control regulator parameter in every working states. If the processor of the CCD sensor can temporarily remember and save the information of the target before it moves out of the FOS, correspondingly, the FOS may be extended. The data forecast technology is used to store the target information. The automatic interception experiments are carried out to verify the control strategy.
Considering system stability, the tracking servo system of electro-optical theodolite is often designed as type I servo system. In principle steady state velocity error and acceleration error exist in it. Especially when tracking fast moving targets, the tracking error will become bigger. To minimize the tracking error a higher order servo system can be used. However, it is very difficult to keep such servo system stable. In this paper a kind of dynamic type II servo system according to Fuzzy logic theory was designed to solve the above contradiction successively.
First, the stationary time is calculated, and accordingly, the minimum stable speed or the speed resolving power of the Ground Servo System is discussed. Through simulation we analyze the interfering result and tracking effect.
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