Infrared Search and Track system development

Abstract

This paper discusses the objectives of the Air Force's Infrared Search and Track (IRST) Advanced Development Program and the basic elements of an infrared system that must be analyzed prior to the design of an IRST system. Why Is An IRST Needed? The development and deploynient of IRST systems is essential to meet the critical needs of modern air-to-air warfare. These needs are: o Operation in jamming environment o Long-range detection The high-velocity targets at high altitude creates a severe time compression problem for successful intercept which imposes a need for long range detection. Because of the intense IR radiation of the high fast target, an Infrared Search Track System can provide this long-range detection capability. It performs this task passively, on both large and small radar cross-section targets, without being hindered by jamming. The prime features of the IRST against the low altitude tactical targets is again passive detection without degradation by jamming. IRST detection range at low altitude is much less than for the high altitude targets because the targets fly slower, radiate less IR energy and there is significantly more atmospheric attenuation. IRST Program Overview Infrared Search and Track Systems (IRSTS) are now under development by the Air Force (AFWALIAART-1). General Electric and ITT Avionics were awarded contracts in 1981 for the design, fabricatjon and flight test of an IRST system. Both IRST systems are packaged in a pod that will be mounted for flight test on the left forward inboard missile (AIM-7) location on the F-15 test aircraft. The flight test is a feasibility demonstration to determine the relative quantitative and qualitative effectiveness and utility of an IRST as a complement to an airborne intercept radar. The IRSTS will be evaluated under a wjde range of offset angles, relative velocities, ranges and altitudes, emphasizing realistic operational scenarios.