Editing McDonnell Douglas F-15 Eagle (section)

===Avionics===
[[File:AN-APG-63, view 1, X-band pulse-doppler radar, Hughes Aircraft, 1973 - National Electronics Museum - DSC00395.JPG|thumb|left|upright|[[AN/APG-63]] radar]]

A multimission [[avionics]] system includes a [[head-up display]] (HUD), advanced radar, [[AN/ASN-109]] [[inertial guidance system]], flight instruments, [[ultra high frequency]] communications, and [[tactical air navigation system]] and [[instrument landing system]] receivers. It also has an internally mounted, tactical [[electronic warfare]] system, [[Identification friend or foe]] system, an [[electronic countermeasure]]s suite, and a central [[digital computer]].<ref name=Gunston_p_194>Gunston 1986, p. 194.</ref>

The HUD projects all essential flight information gathered by the integrated avionics system. This display, visible in any light condition, provides the pilot information necessary to track and destroy an enemy aircraft without having to look down at [[cockpit instrument]]s.<ref>Huenecke 1987, pp. 227–30.</ref>

The F-15's versatile [[AN/APG-63 radar family|APG-63 and 70]] [[pulse-Doppler radar]] systems can look up at high-flying targets and [[look-down/shoot-down]] at low-flying targets without being confused by ground [[clutter (radar)|clutter]]. These radars can detect and track aircraft and small high-speed targets at distances [[beyond visual range]] down to close range, and at altitudes down to treetop level. The APG-63 has a basic range of {{convert|100|mi|nmi km}}. The radar feeds target information into the central computer for effective weapons delivery. For close-in [[dogfight]]s, the radar automatically acquires enemy aircraft, and this information is projected on the head-up display. The F-15's [[electronic warfare]] system provides both threat warning ([[radar warning receiver]]) and automatic countermeasures against selected threats.<ref name=Jenkins_p97>Jenkins 1998, pp. 97–104.</ref>

The improved [[APG-63(V)2]] and (V)3 [[active electronically scanned array]] (AESA) radar upgrade included most of the hardware from the APG-63(V)1, but added an AESA to provide increased pilot [[situation awareness]]. The AESA radar has an exceptionally agile beam, providing nearly instantaneous track updates and enhanced multitarget tracking capability. The APG-63(V)2 and (V)3 are compatible with current F-15C weapon loads and enable pilots to take full advantage of AIM-120 AMRAAM capabilities, simultaneously guiding multiple missiles to several targets widely spaced in [[azimuth]], elevation, or range.<ref name=Upgrade_radar/>