Editing Boeing E-3 Sentry (section)

====RSIP====
The Radar System Improvement Program (RSIP) was a joint US/NATO development program.<ref name=USAF1/> RSIP enhances the operational capability of the E-3 radars' [[electronic countermeasures]], and improves the system's reliability, maintainability, and availability.<ref name=USAF1/> Essentially, this program replaced the older [[transistor-transistor logic]] (TTL) and [[emitter-coupled logic]] (MECL) electronic components, long-since out of production, with off-the-shelf [[computer]]s that utilised a [[High-level programming language]] instead of [[assembly language]]. Significant improvement came from adding [[pulse compression]] to the pulse-Doppler mode.<ref name=Northrop1/> These hardware and software modifications improve the E-3 radars' performance, providing enhanced detection with an emphasis towards low [[radar cross-section]] (RCS) targets.<ref name=USAF1/>

The RAF had also joined the USAF in adding RSIP to upgrade the E-3's radars. The retrofitting of the E-3 squadrons was completed in December 2000. Along with the RSIP upgrade was installation of the Global Positioning System/Inertial Navigation Systems which improved positioning accuracy. In 2002, Boeing was awarded a contract to add RSIP to the small French AWACS squadron. Installation was completed in 2006.<ref name=USAF1/><ref name=Boeing3>{{cite web |url=http://www.boeing.com/defense-space/ic/awacs/e3svcww/ukfr.html |title=AWACS For United Kingdom and France |access-date=26 May 2007 |publisher=Boeing |url-status=dead |archive-url=https://web.archive.org/web/20070227082213/http://www.boeing.com/defense-space/ic/awacs/e3svcww/ukfr.html |archive-date=27 February 2007}}</ref> Saudi Arabia began RSIP upgrades in 2013; the first aircraft being upgraded by Boeing in Seattle with the four remaining aircraft upgraded in Riyadh between 2014 and 2016.{{citation needed|date=January 2022}}