Testing Technology Research On The Line-of-sight Drift Of Inertial Stabilized Sighting System

The inertial system which is the eyes of the modern weapon system has a great influence of the speed of finding, tracking and hitting the target and the first hit rate of the weapon. However, the problems exist in this inertial system are when time goes on, the target image in the field of view moving slowly, or even out of the field of view. Therefore, there is an urgent need for a precision measuring instruments to measure the amount of drift and the amount of drift caused by the gyro zero drift and the servo circuit in order to measure the aiming accuracy of sighting equipment.This paper has analyzed the causes of the line-of-sight drift such as the earth’s rotation, the servo circuit zero drift and the gyro drift. Based on that, a new kind of high precision test method is proposed. The observation instrument is introduced to aim the cross target emits by the parallel light pipes and at the same time the cross target will be seen in the output video images. Therefore, the drift between the target cross and image center will be different when time changes. And the line-of-sight drift curve will be transferred by the computer directly. These can solve the problems of complex measurement and low accuracy.In this test system, the servo system which carries the sighting instrument requires sufficient strength and stiffness of the mechanical structure as well as a better dynamic response capability of the servo system. In terms of that, UG is used to build a3D model. For one hand, static analysis is proceeded to meet the stiffness and strength requirements. And for another, design optimization and modal analysis are also proceeded to obtain the high dynamic response ability.Except for the better capacity of resisting disturbance, the servo turntable should be fast, accurate and stable. On the basis of the controller designing method, the current loop regulator, the speed loop regulator and the position loop regulator of the servo system are designed. The transfer functions at each aspects are calibrated. Therefore the test accuracy is been improved.Image processing which is the premise of the output curve of line-of-sight drifting has a great accuracy effects on the final test. In considering the target cross, various pretreatment methods, such as filter, edge detection are compared. Based on that, the image preprocessing method best suited for this test system is found. A series of cross center detection methods are also researched and the HOUGH transform which is proved to high-accuracy is chosen as the center detection algorithm of test system.This paper has made a in-depth studies on the mechanical structure, the servo system and image processing. Ensuring that the test system has a high measurement accuracy. This device is thought to be a great solution to the sight instrument for line-of-sight drift detection.