31 августа 2008 01:46:42 74 2 0.00 / 0
F-22 Aircraft: Progress in Achieving Engineering and Manufacturing Development Goals (Letter Report, 03/10/98, GAO/NSIAD-98-67). <br />...<br />RADAR CROSS SECTION<br />------------------------------------------------------- Appendix I:0.6<br /><br />The radar cross section (RCS) parameter essentially refers to how<br />large the F-22 should appear to enemy radar. The smaller an<br />aircraft's RCS, the harder it is for enemy radar to detect and track. <br />A small RCS, along with several other factors,\2 contributes to an<br />aircraft's low observability or "stealthy" nature. This particular<br />parameter is called front sector RCS, which means it is the RCS when<br />the F-22 is viewed from the front by enemy radar. While there are<br />over 200 F-22 RCS measurement points, the Air Force considers the<br />front sector RCS the most important measure of the aircraft's ability<br />to avoid detection by an enemy. <br /><br />The Air Force estimated the F-22's front sector RCS will be smaller<br />or better than its goal. Air Force RCS estimates were based on<br />component models that predict the RCS of major components, such as<br />engine inlets and wings, and then use this data to predict the RCS of<br />an entire aircraft. There are 27 major subparameters of this RCS<br />parameter. RCS design validation and specification compliance are<br />also being conducted with a full-scale F-22 mounted on a pole<br />enabling testers to take RCS measurements. This testing will<br />continue into 1999. In-flight RCS measurements will begin in 1999<br />and continue into 2002. <br /><br /><br />--------------------<br />\2 Other factors contributing to an aircraft's low observability<br />include low (1) infrared signature, (2) electromagnetic signature,<br />(3) acoustic level, and (4) visibility.