The Application Of Prediction Filtering Technique In TV Tracking System

With the increase of the velocity and acceleration of the moving target, it produces a large accretion of dynamic error of O-E theodolite. The control methods in existence can not suffice for the needs of tracking precision bit by bit. How to improve the tracking precision has come to be the disquisitive highlight recently. A prediction filter method is introduced in this dissertation. It can minish the dynamic error greatly by using this method.Firstly, developments of optic measuring instruments'servo systems are put forward in the dissertation and significances of the dissertation are set forth. Mathematic models of servo system are set up and simulation diagrams are established with SIMULINK.Application of prediction filter method in the servo system of O-E theodolite is discussed in detail in the dissertation. A method differing from the former is brought forward. Why prediction filter method method can improve tracking precision is analyzed in theory and effects on dynamic performances of the method are analyzed, too. A mathematic simulation is carried out.In order to deduce the effects on dynamic performances, a method by using prediction filter and exponent is introduced and this method is proved by mathematic simulation. To overcome the problem of over offset after the applying of prediction filter, the method of speed lagging complementation and subsection adding of filter value, and it works in simulation and later experiments.Lastly, the theories discussed in this dissertation are tested with experiments. The experiment results are same as the simulation results, which verifies that the dynamic high type control method discussed in the dissertation is correct and it is very valuable for engineering. Aiming at the problems in the experiments some opinions and possible solutions are advanced.