Adaptive infrared counter countermeasure for two-color spinning concentric-annular-ring reticle seeker

This paper presents a dynamic simulation loop that gives tracking results f or a two-color concentric annular ring (CAR) reticle seeker. Our simulation tool includes a target flare model and a proportional navigation guidance loop. The CAR reticle system's performance and the flare effects are analyz ed in various scenarios. When a flare is present in the field of view, the simulation results show that the reticle seeker cannot maintain precise tar get tracking. We propose a two-color countercountermeasure using the least- mean-square method to cope with a presence of infrared (IR) flares. The pro posed method makes use of simultaneous processing of the modulation output in two IR wavelength bands. One is the midwave IR (a primary input signal), and the other is the shortwave IR (a reference input signal). Simulation r esults have shown that our adaptive algorithm can achieve effective cancell ation of flare signals with high intensity. (C) 2001 Society of Photo-Optic al Instrumentation Engineers.