Simulation of reticle seekers by using an image-processing system

摘要

Abstract: Reticle systems are considered to be the classical approach in estimating the position of a target in a considered field of view and are widely used in infrared seekers and trackers. This type of seeker is most suitable for tracking airborne targets such as aircrafts and missiles. For simulation of reticle systems a number of different methods can be used. The relationship between the detector signal u(t), the scene radiance in the reticle plane s(x,t) and the reticle transmission r(x,t) can be expressed as: u(t) $EQ $INT$-A$/r(x,t) $DOT s(x,t)dx. By using an image processing system where the reticle pattern as well as the received radiation are described as digitized images of rather high resolution, simulations can easily be performed. The method can be used for simulation of systems with spinning reticles as well as for systems utilizing fixed reticles with off-axis rotation lens or mirror. Any arbitrary reticle pattern can be studied and the pattern can easily be altered. The simulations have been performed by using a TERAGON$+TM$/ 4200 image processing system. This paper will describe the simulation method and present a number of examples.!0