Infra-red target detection and recognition system

摘要

An I. R. target detection arrangement having a high-inertia line scan and a low inertia frame scan. The line scan is performed by scanning a line of I. R. detectors broadside over a section of the target scene, storing the detector outputs for each point on each line, repeating the line scan and output storage a number of times without change of frame scan, accumulating the outputs for each point obtained in repeated scans, and stepping the frame scan to the next section. A greater signal/noise ratio is thus obtained. Upon detecting a target, the frame scan is switched to a continuous mode and the field of view is narrowed and magnification increased. In each section interlacing may be obtained by stepping the frame scan half the line pitch and repeating the line scan process before proceeding to the next section.