قرأت موضوع في ويكيبيديا يقول ان المقطع الراداري لاف 22 هو واحد على 5 اي 0.2
وقرأت في مصادر كثيرة في المنتدى ان المقطع هو 0.0001
of the F-22 is due to a combination of factors, including the overall shape of the aircraft, the use of radar absorbent material (RAM), and attention to detail such as hinges and pilot helmets that could provide a radar return.
However, reduced radar cross section is one of five
facets of presence reduction addressed in the designing of the F-22. The F-22 was designed to disguise its infrared emissions, reducing the threat of infrared homing
("heat seeking") surface-to-air
or air-to-air missiles
, including its flat thrust vectoring nozzles.
The aircraft was designed to be less visible to the naked eye; radio, heat and noise emissions are equally controlled.
F-22 with external weapons pylons.
The F-22 reportedly relies less on maintenance-intensive radar absorbent coatings than previous stealth designs like the F-117
. These materials are susceptible to adverse weather conditions.
Unlike the B-2
, which requires climate-controlled hangars, the F-22 can undergo repairs on the flight line or in a normal hangar.
The F-22 features a Signature Assessment System
which delivers warnings when the radar signature is degraded and has necessitated repair.
The exact radar cross section
(RCS) remains classified; however, in 2009 Lockheed Martin released information indicating it to have a RCS (from certain angles) of −40 dBsm
– the equivalent radar reflection of a "steel marble".
Effectively maintaining the stealth features can decrease the F-22's mission capable rate
to 62–70%.[N 2]
The effectiveness of the stealth characteristics is difficult to gauge. The RCS value is a restrictive measurement of the aircraft's frontal or side area from the perspective of a static radar. When an aircraft maneuvers it exposes a completely different set of angles and surface area, potentially increasing visibility. Furthermore, stealth contouring and radar absorbent materials are chiefly effective against high-frequency radars, usually found on other aircraft. Low-frequency radars
, employed by weather radars and ground warning stations, are alleged to be less affected by stealth technologies and are thus more capable as detection platforms.
Rebecca Grant states that while faint or fleeting radar contacts make defenders aware that a stealth aircraft is present, interception cannot be reliably vectored to attack the aircraft.
The F-22 also includes measures designed to minimize its detection by infrared, including special paint and active cooling of leading edges to deal with the heat buildup encountered during supercruise flight.