Abstract

In performing infrared (IR) target detections in an optically cluttered background, the analysis of the basic optical and radiometric relations is a first requirement for the assessment of passive IR sensors. For given target properties (temperature, emittance, and area), specified atmospheric path and sensor configuration, the SNR and clutter-to-noise ratio are estimated to determine if target acquisition can occur. The optoradiometric model described is based on an indenture of sophisticated computer modules providing ever greater radiometric detail. Such a module provides a much higher degree of accuracy for sensor performance prediction. It may be employed to determine the expected performance of a seeker in a variety of changing conditions (weather, line-of-sight, etc.) and tactical situations (nonstationary targets) that are not easily evaluated from the basic radiometric relations. The optoradiometric model combines detailed models (commercial and noncommercial) to provide sensor performance detail for higher level analyses in a variety of user defined situations. The presence of a dynamic portion to engage time-dependent scenarios enhances the ability of the model to evaluate various tactical sensor situations. This type of interdisciplinary performance model, which accurately represents the strong interaction between optics, control systems, and signal processors, allows the design of a sensor to be readily optimized for a variety of seeker configurations.

© 1991 Optical Society of America