Study On Error Analysis And Correction Of Target Location For Electro-optical Detection System

Developing with the modern equipments of high technology, Electro-opticalweapons play a more and more important role in reconnaissance, surveillance,orientation, navigation, communication systems. As an essential part of these weapons,the electro-optical detection system should gradually been improved, especillly in thetarget location accuracy. The paper focuses on the working principles, target locationerror analysis modeling and evaluation, pointing error correction, and stabilization errorsuppression in order to find a comparative perfect error analysis theory and a practicalerror compensation method for the system.The following studies are included in this paper:1. Explain the overall structure and main functions of the electro-optical detectionsystem; conduct kinematics and dynamics equations on the basis of the stabilization andtracking principle of two-axis platform; and deduce a general target location equationthat suits different platforms through the multi-body system modeling theory andhomogeneous coordinate transformation method.2. Based on the analysis of different error sources of the electro-optical detectionsystem, an error synthetic modeling theory is presented by introducing the targetlocation error, that is, an integrated technical index. By quantitatively analyzing eacherror in every subsystem, deduce the error synthetic model for target location, whichunifies all error factors into one model. Each error model can be directly extracted fromthe synthetic one to avoid multiple modeling and to extend the application of the errormodel. Subject to the quantitative indexes coming from the error analysis, the paperadopts Monte Carlo evaluation methods to find the influencing rules of each error factorand their proportion in the target location error, and to optimize the system design.3. According to the requirements of the electro-optical detection system on highprecision pointing, the paper explains the correction principle for pointing error,addresses the key problems to be solved during the correction, and presents a basicparameter model, which has explicit physical meaning. The paper further conducts anumerical analysis after a comparison with the traditional global function model tostudy the influences from the nonlinear error factors. An improved algorithm subject tothe semi-parametric regression model is also presented further on the basis of the basicparameter model for pointing error, and then proves it by constructing a pointing errorseparation and revision system.4. Based on the MEMS gyro and accelerometer after studying the influences onprecision stability from the gyro performance and frictional behavior of the servocontrol system, the present paper introduces an optimized estimated algorithm forinertia angular velocity, which extends the bandwidth, suppresses the noise of the gyro, and provides a new idea for developing a miniaturized, light weight, and highly accuratesystem. This meets the requirements for inertial angular velocity signals with highprecision and bandwidth. Subject to the switching structures, a platform angularvelocity estimated algorithm is specially presented to the nonlinear friction instabilized-loop of the servo control system, which helps realize the dual-loop structureand effectively improves the influence of the friction to stabilize accuracy.5. Separation and correction of pointing errors for a designed electro-opticalsystem has been down, and the indoor experiment shows that the pointing accuracy hasbeen improved greatly by the algorithm based on the semi-parametric regression model.The outdoor expriment of target location shows the validity and practicability of thegeneral target location model.