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1ariy electrooptical (E'O) systems incorporate an inaging sensor and a Line of Sight (LOS) deflection mirror. At a higher system level, such as for fire control or mIssile homing applications, these sensors are required to neasure angular target position very accurately. This work presents ar approach that has been developed for the modeling and calibration of such electrooptical systems. Using a generic system which includes a mirror mounted on a twoaxis LOS steering unit and an imaging sensor, a description of the mathematical model of the system is given here. This model may be used for system performance analyses as well as for developing various algorithms for the calculation of target angular position.The system model uses a number of calibration parameters such as gimbal nonorthogonality and other assembly and production errors. These are obtained from laboratory measurement results via a mathematical calibration model. We explain how the calibration model is developed from the system model. The method shown here can significantly reduce the number of computations and the look-up-table capacity needed in an operational system, as well as reducing the extent of laboratory calibrations usually required. 392

A laboratory simulator for dynamic infrared scenes was built and used for evaluation of a FLIR tracker.Background and targets were simulated by separate fine mesh patterns. These are made by a special process enabling one to simulate real or synthetic (computer generated) infrared scenes.The set -up can be controlled to simulate target movements against a background in two degrees of freedom.The set -up also simulates independent tracker movements.The problems of superpositioning the target on the background in such a way that the target will not appear semitransparent, was achieved by meticulous set -up design.The simulator was used to measure the dependence of the performance of a FLIR tracker on:clutter, background temperature, target contrast, target movements, target range, and line of sight movement and vibrations.The paper describes set -up design considerations, target and background model fabrication methods and experimental test data.