{"id":336248,"date":"2026-04-13T09:53:36","date_gmt":"2026-04-13T07:53:36","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/the-small-disc-keeping-f-15es-alive-over-iran\/"},"modified":"2026-04-13T10:27:26","modified_gmt":"2026-04-13T08:27:26","slug":"the-small-disc-keeping-f-15es-alive-over-iran","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/the-small-disc-keeping-f-15es-alive-over-iran\/","title":{"rendered":"The Small Disc Keeping F-15Es Alive Over Iran"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\nA small circular disc on the dorsal spine of an F-15E Strike Eagle, just aft of the speed brake \u2014 that is the most significant piece of new hardware photographed on an American combat aircraft in months. The disc is a Controlled Reception Pattern Antenna, or CRPA, and it is part of BAE Systems&#8217; Digital GPS Anti-jam Receiver, known as DIGAR. It was spotted in images of an F-15E operating during Operation Epic Fury. It is the first confirmed combat deployment of the system.\n\nIn an operational environment where Iran has demonstrated credible electronic warfare capabilities \u2014 including GPS jamming and spoofing \u2014 a hardened navigation system is not an upgrade. It is a survival requirement.\n\n\n<div style=\"background:#f5f5f5;border-left:4px solid #5C91FF;padding:18px 22px;margin:24px 0;border-radius:0 8px 8px 0;font-size:15px;line-height:1.8\">\n<strong>Quick Facts<\/strong><br>\n\u2022 <strong>System:<\/strong> DIGAR \u2014 Digital GPS Anti-jam Receiver<br>\n\u2022 <strong>Antenna:<\/strong> CRPA (Controlled Reception Pattern Antenna), dorsal-mounted<br>\n\u2022 <strong>Manufacturer:<\/strong> BAE Systems (Cedar Rapids, Iowa)<br>\n\u2022 <strong>Contract:<\/strong> $13 million, awarded September 2022<br>\n\u2022 <strong>Antenna elements:<\/strong> Up to 7 per CRPA disc<br>\n\u2022 <strong>Platform:<\/strong> F-15E Strike Eagle<br>\n\u2022 <strong>First combat use:<\/strong> Operation Epic Fury, April 2026\n<\/div>\n\n\n<h2 style=\"padding-top:22px\">How CRPA Defeats Jamming<\/h2>\n\nA standard GPS antenna is omnidirectional \u2014 it receives signals from all directions equally. This makes it inherently vulnerable. A jammer on the ground or in the air can overwhelm the weak GPS signal (which arrives from satellites at roughly the power of a car headlight seen from 20,000 kilometres away) with noise. A spoofer can transmit a fake GPS signal that shifts the receiver&#8217;s calculated position by hundreds of metres \u2014 enough to send a precision-guided weapon into the wrong building.\n\nCRPA solves this through spatial filtering. The antenna contains multiple elements \u2014 BAE Systems&#8217; implementation supports up to seven \u2014 arranged in a circular array. The receiver compares the signal arriving at each element, calculates the direction of any interference source, and electronically steers a null (a blind spot) toward the jammer. The legitimate satellite signals, arriving from above, pass through. The jamming signal, arriving from below or from the side, is suppressed.\n\nThe mathematics behind this are well-established \u2014 adaptive beamforming has been used in radar and communications for decades \u2014 but miniaturising it into a conformal antenna that fits flush on the spine of a tactical fighter is a significant engineering achievement. The CRPA must operate across the full GPS frequency band, including the encrypted M-Code military signal, while withstanding the vibration, temperature extremes, and electromagnetic environment of a fast jet in combat.\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=992984967  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/0\/02\/F-15E_391st_USAF_081215-F-7823A-931.jpg\/960px-F-15E_391st_USAF_081215-F-7823A-931.jpg\" alt=\"F-15E Strike Eagle\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An F-15E Strike Eagle of the 391st Fighter Squadron. The new CRPA antenna is mounted on the dorsal spine, just aft of the speed brake. US Air Force \/ Wikimedia Commons<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">Why Iran Forced the Issue<\/h2>\n\nIran has invested heavily in electronic warfare. Its air defence network includes systems capable of GPS jamming across wide areas \u2014 a relatively inexpensive way to degrade the accuracy of American precision-guided munitions. During Epic Fury, anecdotal reports have emerged of JDAM accuracy being affected in certain areas, suggesting that Iranian jamming has had at least some operational effect.\n\nDIGAR is the counter. By hardening the GPS receiver on the aircraft itself, the system ensures that the navigation solution feeding the weapons computer, the targeting pod, and the flight management system remains accurate even in a dense jamming environment. This matters not just for weapons delivery but for basic flight safety \u2014 a pilot who cannot trust their navigation in hostile airspace is a pilot in danger.\n\n<h2 style=\"padding-top:22px\">The Broader Upgrade Picture<\/h2>\n\nDIGAR is part of a wider F-15E modernisation effort that includes the Radar Modernisation Programme (RMP), which replaces the legacy APG-70 radar with the APG-82 AESA, and the MUOS\/SATURN communications upgrade. Together, these systems transform the F-15E from a 1980s airframe with 1990s avionics into a platform that can operate in a 2020s electronic warfare environment.\n\nThe $13 million BAE Systems contract from 2022 covered installation on an initial batch of F-15Es at Cedar Rapids. The speed with which the upgrade moved from contract to combat deployment \u2014 less than four years \u2014 is unusually fast by Pentagon standards, and reflects the urgency of the GPS vulnerability problem.\n\nThat small circular disc on the spine of the jet is not photogenic. It will never make a poster. But in the electromagnetic battle over Iran, it may be the most important piece of equipment on the aircraft.\n\n<em>Sources: The Aviationist, BAE Systems, Air &#038; Space Forces Magazine<\/em>","protected":false},"excerpt":{"rendered":"<p>A small circular disc on the dorsal spine of an F-15E Strike Eagle, just aft of the speed brake \u2014 that is the most significant piece of new hardware photographed on an American combat aircraft in months. The disc is a Controlled Reception Pattern Antenna, or CRPA, and it is part of BAE Systems&#8217; Digital [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":337424,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[664,670],"tags":[],"class_list":["post-336248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Small Disc Keeping F-15Es Alive Over Iran | MiGFlug.com Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/migflug.com\/jetflights\/the-small-disc-keeping-f-15es-alive-over-iran\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Small Disc Keeping F-15Es Alive Over Iran | MiGFlug.com Blog\" \/>\n<meta property=\"og:description\" content=\"A small circular disc on the dorsal spine of an F-15E Strike Eagle, just aft of the speed brake \u2014 that is the most significant piece of new hardware photographed on an American combat aircraft in months. 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