Study On The High Precision Electro-optical Tracking Servo Control System Based On Compax3and Data Fusion

The target mobility is increasingly strong with the development of science andtechnology, so the requirements for the electro-optical tracking system performancebecome higher and higher. The turntable servo system, as the hardware ofelectro-optical tracking system, is extremely important. The tracking precision ofservo system depends on servo controller and servo control method, so the mainmeasures for improving the tracking precision are using higher performancecontroller and more advanced control method. In this paper the electro-opticaltracking servo turntable is set up based on Compax3servo controller, furthermore,the on-axis technology is discussed and verified by experiment.Firstly, the concept and component parts of electro-optical tracking system areintroduced, the current developing situation of servo controller and method are alsobriefly summarized.The principles of compound control, equivalent compound control and on-axisare introduced, respectively. The key point to realize the on-axis tracking is how toprecisely capture the position, velocity and acceleration of the target. Although thetarget information can be predicted through the filter and prediction, it is impossibleto get a general model which can be applied to all objects because of the complexdiversity and increasing mobility of the tracked targets.. In this paper the nerve netextreme learning machine (ELM) was adopted to obtain the target motioninformation through data fusing between the target miss distance and the movingstate of turntable. The ELM neural network algorithm is optimized in this study to reduce thepervious larger amounts of computation. The period of ELM is decreased to4.58msand meets the real-time requirement of the electro-optical tracking system The ELMsimulation is done according to actual experimental data sampled from anelectro-optical tracking system.In order to obtain the turntable acceleration, the acceleration sensor is fixed onthe turntable. The test principle and model of acceleration sensor are analyzed. Andthe transfer function of acceleration sensor is acquired through the freq uency methodand furthermore regulated. The turntable velocity and acceleration are contrastedwhich are obtained separately by encoder and acceleration sensor.The turntablevelocity and acceleration obtained by encoder and acceleration sensor, respective ly,are contrastedFinally, the electro-optical tracking servo platform is established based on theCompax3servo controller, and the main parameters and performance of the platformare tested. The feature of detector is simulated by programmer, and theelectro-optical tracking experiment is done. When the target maximal velocity is30/sand accelerator25/s2, the maximal system tracking error decreased from10.35′, when the system was a closed-loop control, to0.38′when that of on-axis.This paper mainly experimentally verified the target motion information, gotten bythe novel method, had better real time performance and higher accuracy, which isexpected to be a potential to improve the system tracking precision significantly.