{"id":27773216,"date":"2026-10-12T16:38:03","date_gmt":"2026-10-12T14:38:03","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/radar-jamming-techniques-noise-deception-drfm-rgpo\/"},"modified":"2026-10-12T16:38:47","modified_gmt":"2026-10-12T14:38:47","slug":"radar-jamming-techniques-noise-deception-drfm-rgpo","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/es\/radar-jamming-techniques-noise-deception-drfm-rgpo\/","title":{"rendered":"Radar Jamming Techniques: Noise, Deception and DRFM Explained"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n<!-- mfsh:top -->\r\n\r\n<style>\r\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid 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It shouts a pulse into the dark, waits, and measures how long the echo takes to come back. Distance is just time multiplied by the speed of light and halved. There is no judgement in it and no scepticism. Whatever comes back, it believes.<\/p>\r\n\r\n<p>That credulity is the whole opening for electronic attack, and it is why jamming splits into exactly two families. You can bury the echo in noise so the radar cannot hear it. Or you can send the radar an echo it likes better than the real one. Everything else is detail, and the detail is where it gets interesting.<\/p>\r\n\r\n<p>Afterburner has written about the aircraft that carry jammers and about the chaff and flares that decoy a missile in its last seconds. This is the layer underneath: what the jammer is actually doing to the radar while all that is going on.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f6f8;border-left:4px solid #5C91FF;padding:18px 22px;margin:26px 0\">\r\n<p style=\"margin:0 0 10px;font-weight:700;color:#0d1117;font-size:17px\">Quick Facts: the jamming taxonomy<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Two families:<\/strong> noise jamming (hide the target) and deception jamming (replace the target)<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Noise, three forms:<\/strong> spot, barrage and swept, grouped by how the jammer concentrates its power<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Spot jamming:<\/strong> all power on one frequency. Devastating against a fixed-frequency radar, almost useless against a frequency-agile one<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Barrage jamming:<\/strong> many frequencies at once, so each is jammed less hard. The handbook figure is an 8.6 dB loss in jam-to-signal ratio against 0.7 dB for spot<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Deception, the classics:<\/strong> range-gate pull-off, velocity-gate pull-off, inverse gain, cross-polarisation, terrain bounce<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>The modern enabler:<\/strong> digital radio frequency memory (DRFM), which records the incoming pulse and replays it altered<\/p>\r\n<p style=\"margin:3px 0;font-size:15px\"><strong>Primary source:<\/strong> U.S. Naval Air Warfare Center Weapons Division, <em>Electronic Warfare and Radar Systems Engineering Handbook<\/em><\/p>\r\n<\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Noise: Hiding in Plain Hearing<\/h2>\r\n\r\n<p>Noise jamming is the blunt half of the business. The U.S. Navy handbook defines it as a continuous random signal radiated to conceal the aircraft echo, and adds the condition that makes or breaks it: the average amplitude has to be at least as great as the average amplitude of the radar echo. Below that, you are not hiding, you are just adding a hiss the operator may not even notice.<\/p>\r\n\r\n<p>There are three ways to spend a jammer&rsquo;s power, and the handbook groups them exactly that way. Spot jamming puts everything on one frequency. Barrage spreads it across many at once. Swept jamming shifts the full power from one frequency to the next, sweeping through a band.<\/p>\r\n\r\n<p>Spot is the most violent and the most brittle. Focus all your transmitter output on the frequency a radar is using and you will comprehensively ruin its day. The handbook puts 85 per cent of that jamming energy inside the victim receiver, which costs you only 0.7 dB of jam-to-signal ratio. Then the radar hops to a different frequency and you are jamming empty sky. Against a frequency-agile set, the handbook is blunt: it would hardly be affected.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/ea-18g-growler-an-alq-99f-tactical-jamming-system.jpg\" alt=\"AN\/ALQ-99F tactical jamming system pod mounted under the wing of a US Navy EA-18G Growler of squadron VAQ-141\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An AN\/ALQ-99F tactical jamming system pod under the wing of a VAQ-141 <a href=\"https:\/\/migflug.com\/aircraft\/ea-18g-growler\/\">EA-18G Growler<\/a> at MCAS Iwakuni. The stencilling on the pod names the frequency band it is set up to transmit in, which is the whole problem in one photograph. Photo: Wikimedia Commons \/ CC BY-SA 4.0<\/figcaption><\/figure>\r\n\r\n<p>Barrage is the answer to agility and it comes with an honest bill. Jam fifty frequencies at once and the radar cannot run away from you, but your transmitter has to divide its output between all fifty. The handbook&rsquo;s worked example drops the jamming energy reaching the receiver from 100 per cent to 14 per cent, an 8.6 dB penalty against spot jamming&rsquo;s 0.7 dB. Its own summary of the trade is the sentence every EW officer eventually says out loud: the more frequencies being jammed, the less effectively each is jammed.<\/p>\r\n\r\n<p>Swept jamming is the compromise. Keep the narrow bandwidth and the power density of spot, but move it continuously across the band, so that any given radar is blanketed some of the time rather than slightly annoyed all of the time. It is spot jamming trying to look like barrage jamming, and against some receiver designs it works.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/NTLaMrJFMGo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-10px;font-style:italic\">A clear walk through what a jammer is doing to a radar receiver, and why raw transmitter power is not the whole answer.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Deception: Giving the Radar Something Better to Believe<\/h2>\r\n\r\n<p>Noise jamming announces itself. A radar screen full of hash tells the operator, instantly, that somebody is out there and roughly where. Deception jamming is the opposite: done properly, the radar never knows anything is wrong. It is tracking a target, it is happy, and the target is not there.<\/p>\r\n\r\n<p>To understand how that is possible you need one piece of radar plumbing: the range gate. Once a tracking radar finds something, it stops looking at everything else.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;Range gates essentially blank out all signals which originate from ranges outside a narrow window, substantially increasing the signal-to-noise ratio and protecting the radar against unsynchronized jamming pulses&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Electronic Warfare and Radar Systems Engineering Handbook<\/strong> &mdash; U.S. Naval Air Warfare Center Weapons Division, Point Mugu, section 4-13<\/div><\/div><\/div>\r\n\r\n<p>That narrowing is a defence. It is what makes a tracking radar hard to jam with noise, because noise arriving from outside the window is simply discarded. But it is also a handle. The radar has committed itself to one short slice of range, and it is no longer looking anywhere else. Steal the slice and you steal the radar.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Range-Gate Pull-Off, Step by Step<\/h2>\r\n\r\n<p>Range-gate pull-off, RGPO in the literature and range-gate stealing in conversation, is the oldest and most elegant trick in deception jamming. The handbook sets it out in four phases, and it is worth following them in order because each one depends on the last.<\/p>\r\n\r\n<p>First, the jammer samples the illuminating pulse and works out the radar&rsquo;s pulse repetition frequency. It then amplifies that sample and retransmits it in step with the real pulses. At this point the aircraft is deliberately making itself brighter, not dimmer. The jamming power is increased steadily until the replica is far stronger than the aircraft&rsquo;s own skin return.<\/p>\r\n\r\n<p>Second, the radar does what a well-designed radar does when a signal gets too strong: it reduces the sensitivity of its receiver to avoid overload. That is the moment the trap closes. With the gain turned down, the genuine skin echo sinks below the noise floor. The radar is now tracking the replica and only the replica, and it has no idea.<\/p>\r\n\r\n\r\n<figure class=\"mfg-diagram\" style=\"margin:26px 0;width:100%\"><svg viewBox=\"0 0 980 520\" width=\"100%\" style=\"display:block;width:100%;height:auto;border:1px solid #e2e7ee\" role=\"img\" aria-label=\"Diagram of the four steps of a range-gate pull-off attack on a tracking radar\"><rect x=\"0\" y=\"0\" width=\"980\" height=\"520\" fill=\"#f8f9fa\"\/><text x=\"26\" y=\"36\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:19px;font-weight:700;fill:#0d1117\">Range-Gate Pull-Off, four steps<\/text><text x=\"26\" y=\"58\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:13px;fill:#666\">How a repeater jammer walks a tracking radar off the aircraft that is actually there<\/text><text x=\"26\" y=\"114\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:13.5px;font-weight:700;fill:#0d1117\">1. Lock-on<\/text><text x=\"26\" y=\"134\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#666\">The gate brackets the aircraft&rsquo;s own echo<\/text><line x1=\"286\" y1=\"148\" x2=\"950\" y2=\"148\" stroke=\"#c9d1dc\" stroke-width=\"1\"\/><rect x=\"268\" y=\"92\" width=\"78\" height=\"64\" fill=\"none\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><text x=\"307\" y=\"86\" text-anchor=\"middle\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:10px;font-weight:700;letter-spacing:1px;fill:#3568e0\">GATE<\/text><rect x=\"292\" y=\"102\" width=\"9\" height=\"46\" fill=\"#0d1117\" opacity=\"1\"\/><text x=\"26\" y=\"212\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:13.5px;font-weight:700;fill:#0d1117\">2. Replica on top<\/text><text x=\"26\" y=\"232\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#666\">Jammer matches the radar&rsquo;s PRF and gets louder<\/text><line x1=\"286\" y1=\"246\" x2=\"950\" y2=\"246\" stroke=\"#c9d1dc\" stroke-width=\"1\"\/><rect x=\"268\" y=\"190\" width=\"78\" height=\"64\" fill=\"none\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><text x=\"307\" y=\"184\" text-anchor=\"middle\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:10px;font-weight:700;letter-spacing:1px;fill:#3568e0\">GATE<\/text><rect x=\"292\" y=\"227\" width=\"9\" height=\"19\" fill=\"#0d1117\" opacity=\"0.55\"\/><rect x=\"318\" y=\"200\" width=\"9\" height=\"46\" fill=\"#e07b1f\"\/><text x=\"26\" y=\"310\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:13.5px;font-weight:700;fill:#0d1117\">3. Walk-off<\/text><text x=\"26\" y=\"330\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#666\">Each replica is delayed more. The gate follows it<\/text><line x1=\"286\" y1=\"344\" x2=\"950\" y2=\"344\" stroke=\"#c9d1dc\" stroke-width=\"1\"\/><rect x=\"431\" y=\"288\" width=\"78\" height=\"64\" fill=\"none\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><text x=\"470\" y=\"282\" text-anchor=\"middle\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:10px;font-weight:700;letter-spacing:1px;fill:#3568e0\">GATE<\/text><rect x=\"292\" y=\"336\" width=\"9\" height=\"8\" fill=\"#0d1117\" opacity=\"0.3\"\/><rect x=\"470\" y=\"298\" width=\"9\" height=\"46\" fill=\"#e07b1f\"\/><text x=\"26\" y=\"408\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:13.5px;font-weight:700;fill:#0d1117\">4. Break-lock<\/text><text x=\"26\" y=\"428\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#666\">Jammer off. The gate is holding nothing<\/text><line x1=\"286\" y1=\"442\" x2=\"950\" y2=\"442\" stroke=\"#c9d1dc\" stroke-width=\"1\"\/><rect x=\"621\" y=\"386\" width=\"78\" height=\"64\" fill=\"none\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><text x=\"660\" y=\"380\" text-anchor=\"middle\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:10px;font-weight:700;letter-spacing:1px;fill:#3568e0\">GATE<\/text><rect x=\"292\" y=\"434\" width=\"9\" height=\"8\" fill=\"#0d1117\" opacity=\"0.3\"\/><text x=\"296\" y=\"474\" text-anchor=\"start\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11px;fill:#454e5e\">true range<\/text><text x=\"950\" y=\"474\" text-anchor=\"end\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11px;fill:#454e5e\">greater range<\/text><rect x=\"296\" y=\"494\" width=\"9\" height=\"9\" fill=\"#0d1117\"\/><text x=\"314\" y=\"503\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#454e5e\">aircraft skin return (fading as the radar reduces gain)<\/text><rect x=\"660\" y=\"494\" width=\"9\" height=\"9\" fill=\"#e07b1f\"\/><text x=\"678\" y=\"503\" style=\"font-family:Montserrat,Helvetica,Arial,sans-serif;font-size:11.5px;fill:#454e5e\">jammer replica<\/text><\/svg><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Range-gate pull-off in four steps, drawn from the sequence set out in the U.S. Naval Air Warfare Center Weapons Division Electronic Warfare and Radar Systems Engineering Handbook. Diagram: Afterburner, MiGFlug&rsquo;s Magazine<\/figcaption><\/figure>\r\n\r\n<p>Third comes the walk. Each replica is retransmitted with a slightly longer delay than the last, which the radar reads as the target receding. The range gates follow obediently, because that is their job. The handbook notes the detail that makes this plausible: the delays are small and incremental, so there is no sudden jump for a tracker to reject.<\/p>\r\n\r\n<p>Fourth, the jammer simply stops. The range gates are now sitting somewhere out in empty space, holding nothing at all, and the real aircraft is far outside the window the radar is looking through. Break-lock. The radar has to fall back to search, reacquire, and start again, and every second of that is a second the aircraft is using.<\/p>\r\n\r\n<p>One refinement is worth knowing because it reverses the intuition. As described, RGPO can only create false targets at greater ranges than the real one, since the replica is transmitted after the skin echo. But if the victim radar&rsquo;s pulse repetition frequency is constant, the jammer can calculate when the next pulse is coming and place its reply so that the false target appears closer rather than further away. A constant PRF is, in this sense, a vulnerability.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The Doppler Version, and the Rest of the Family<\/h2>\r\n\r\n<p>Velocity-gate pull-off is the same idea aimed at a different gate. Against a continuous-wave or pulse-Doppler radar that tracks by velocity rather than range, the jammer amplifies and retransmits the signal with its frequency shifted, so the radar reads an apparent Doppler shift and an apparent rate of change. The velocity gate walks off the target exactly as the range gate does. Modern jammers routinely run both at once, because a radar that is being lied to about where you are and how fast you are going has very little left.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/an-alq-131-ecm-pod-nmusaf.jpg\" alt=\"USAF AN\/ALQ-131(V) electronic countermeasures pod on a transport trolley at the National Museum of the United States Air Force\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An AN\/ALQ-131(V) self-protection pod at the National Museum of the U.S. Air Force, with an <a href=\"https:\/\/migflug.com\/aircraft\/f-117-nighthawk\/\">F-117 Nighthawk<\/a> behind it. The museum placard describes the pod as answering radar threats with a combination of noise, repeater and transponder jamming, which is this article in one sentence. Photo: U.S. Air Force<\/figcaption><\/figure>\r\n\r\n<p>Beyond the two gate-stealers sits a whole shelf of angle-deception techniques, and they are all attacks on a specific radar design rather than on radar in general. Inverse gain re-radiates the radar&rsquo;s pulse train modulated at the rate of the radar&rsquo;s own scan, which confuses a conical-scanning tracker about bearing. Cross-polarisation radiates a signal polarised at right angles to the radar&rsquo;s, which induces angle errors in trackers and sensing errors in the jamming-suppression circuits of surveillance radars. Terrain bounce aims the jamming at the ground so it reflects upwards, creating a virtual image of the jammer on the earth for a home-on-jam missile to chase.<\/p>\r\n\r\n<p>Each of these works beautifully against the right radar and does nothing at all against the wrong one. That is the defining property of deception jamming and the reason electronic order of battle, knowing precisely which radar you are facing, is worth more than transmitter power.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/WAajpKTJj-8\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-10px;font-style:italic\">Rohde &amp; Schwarz demonstrate range-gate and velocity-gate pull-off on test equipment, which is the closest most people will get to watching a gate being stolen.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">DRFM: The Trick That Made Everything Above Harder<\/h2>\r\n\r\n<p>Every deception technique described so far has the same weakness. The jammer has to reproduce the radar&rsquo;s signal, and for forty years it reproduced it badly. Analogue memory loops worked by circulating the captured signal through a front-end amplifier over and over, and every lap degraded it. The copy was recognisably a copy.<\/p>\r\n\r\n<p>Digital radio frequency memory removed that limit. A DRFM digitises the incoming signal at whatever frequency and bandwidth is needed to represent it properly, holds a digital copy in memory, then reconstructs and retransmits it on demand. Because the copy is digital, it is coherent with the original, and a coherent copy is a problem of a completely different order. The radar cannot tell it apart from a legitimate target return, because in every measurable respect it is one.<\/p>\r\n\r\n<p>The idea is older than most people assume. The earliest published description of storing radar pulses digitally appeared in January 1975, in a piece by Sheldon C. Spector in the Association of Old Crows journal <em>Electronic Warfare<\/em>, under a title that still describes the technology better than any acronym: the loopless memory loop.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;You can use smart coordination of jamming techniques&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Petter Bedoire<\/strong> &mdash; Vice-President for sales and marketing, electronic warfare and surveillance systems, Saab, speaking to Armada International<\/div><\/div><\/div>\r\n\r\n<p>What a DRFM does with the stored copy is where the capability lives. It can change the apparent radar cross section of the false target, so the thing the radar is tracking can be made to look like a fighter, a bomber or a cruise missile. It can change the apparent range, the apparent velocity, and the apparent angle. Small frequency shifts introduce velocity errors. More aggressively, a DRFM can distort the phase fronts arriving at the victim&rsquo;s receiving antenna, which attacks monopulse angle measurement, historically the hardest tracking method to deceive.<\/p>\r\n\r\n<p>It also breaks the asymmetry that limited classical RGPO. Because the device is no longer passing a decaying analogue signal round a loop, it can hold a copy and place it where it likes. Reactive jamming puts false targets behind the protected aircraft, as a repeater always did. Predictive jamming puts them in front of it. A radar that could once rely on a false echo always arriving late has lost that comfort.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/fBLHZwEXKeA\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-10px;font-style:italic\">A wider survey of electronic warfare, useful for seeing where the techniques above sit in a real air campaign.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">What Jamming Still Cannot Do<\/h2>\r\n\r\n<p>It is worth ending on the limits, because the subject attracts more breathlessness than it deserves. Noise jamming only works if it is at least as loud as the echo it is hiding, and loud transmissions are themselves a signal: a jammer announces a bearing to anyone listening, and home-on-jam seekers exist precisely because of that.<\/p>\r\n\r\n<p>Deception jamming is the opposite problem. It is quiet, but it is specific. Every technique on the list above is built against a particular radar behaviour, and against the wrong radar it does nothing. Inverse gain needs a conical-scanning tracker. Range-gate pull-off needs a range gate to steal. A technique that works perfectly on Monday is worthless on Tuesday if the opposition has changed a waveform.<\/p>\r\n\r\n<p>That is why the serious money in electronic warfare goes on knowing what you are facing rather than on raw output, and why a jamming pod is only as good as the threat library loaded into it. The physics of lying to a radar has not changed much since the 1970s. The difficulty has always been knowing exactly which lie to tell.<\/p>\r\n\r\n<p><em>Sources: U.S. Naval Air Warfare Center Weapons Division, Electronic Warfare and Radar Systems Engineering Handbook; Association of Old Crows, Electronic Warfare, January 1975; Armada International; National Museum of the United States Air Force.<\/em><\/p>\r\n<!-- mfsh:bottom -->\r\n\r\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\r\n\r\n<!-- \/mfsh:bottom -->\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What are the main types of radar jamming?<\/summary><div class=\"a\">Radar jamming divides into two families. Noise jamming radiates a random signal to bury the target&rsquo;s echo, and comes in spot, barrage and swept forms depending on how the power is concentrated. Deception jamming instead feeds the radar a convincing false echo, using techniques such as range-gate pull-off, velocity-gate pull-off, inverse gain and cross-polarisation.<\/div><\/details><details><summary>What is the difference between noise jamming and deception jamming?<\/summary><div class=\"a\">Noise jamming hides the target by drowning its echo in interference, but it is loud and tells the enemy that something is out there. Deception jamming replaces the target with a false one, and done properly the radar never realises anything is wrong. Noise works against almost any radar; deception works only against the specific radar behaviour it was designed to exploit.<\/div><\/details><details><summary>What is range-gate pull-off (RGPO)?<\/summary><div class=\"a\">Range-gate pull-off is a deception technique that steals a tracking radar&rsquo;s range gate. The jammer copies the radar&rsquo;s pulses and retransmits them louder than the real echo, the radar reduces its gain so the genuine return disappears, and the jammer then delays each copy a little more so the gate walks away from the aircraft. The jammer then stops, leaving the radar tracking nothing.<\/div><\/details><details><summary>What is velocity-gate pull-off (VGPO)?<\/summary><div class=\"a\">Velocity-gate pull-off is the Doppler version of range-gate pull-off. Against a continuous-wave or pulse-Doppler radar that tracks by velocity, the jammer retransmits the signal with its frequency shifted, which the radar reads as an apparent change in speed. The velocity gate follows the false Doppler shift away from the real target.<\/div><\/details><details><summary>What is DRFM in electronic warfare?<\/summary><div class=\"a\">DRFM stands for digital radio frequency memory. It digitises an incoming radar signal, stores a digital copy, then reconstructs and retransmits it. Because the copy is digital it is coherent with the original, so the victim radar cannot distinguish the false return from a real one. The jammer can alter the copy&rsquo;s apparent range, velocity, angle and radar cross section before sending it back.<\/div><\/details><details><summary>Why is barrage jamming less effective than spot jamming?<\/summary><div class=\"a\">Because the jammer has only so much power to spend. Spot jamming puts all of it on one frequency, and the U.S. Navy handbook puts about 85 per cent of that energy inside the victim receiver, a 0.7 dB penalty. Barrage jamming spreads the same power across many frequencies, dropping the share reaching the receiver to around 14 per cent, an 8.6 dB penalty. Barrage buys coverage against a frequency-agile radar and pays for it in effect.<\/div><\/details><details><summary>Can radar jamming defeat a frequency-agile radar?<\/summary><div class=\"a\">Spot jamming largely cannot, because the radar simply changes frequency and the jammer is left transmitting into empty spectrum. Barrage and swept jamming cover a wider band and so remain relevant, but at reduced effectiveness per frequency. Deception jamming is the more practical answer, because it works on how the radar tracks rather than on which frequency it happens to be using.<\/div><\/details><details><summary>Does jamming give away the jammer&rsquo;s position?<\/summary><div class=\"a\">Noise jamming does. A transmitter radiating enough power to mask an echo is itself a strong, locatable signal, and home-on-jam missile seekers are designed to home on exactly that. Deception jamming is far quieter, because it only replies to pulses the radar has already sent, which is one of the main reasons modern electronic attack leans on it.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What are the main types of radar jamming?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Radar jamming divides into two families. Noise jamming radiates a random signal to bury the target\u2019s echo, and comes in spot, barrage and swept forms depending on how the power is concentrated. Deception jamming instead feeds the radar a convincing false echo, using techniques such as range-gate pull-off, velocity-gate pull-off, inverse gain and cross-polarisation.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between noise jamming and deception jamming?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Noise jamming hides the target by drowning its echo in interference, but it is loud and tells the enemy that something is out there. Deception jamming replaces the target with a false one, and done properly the radar never realises anything is wrong. Noise works against almost any radar; deception works only against the specific radar behaviour it was designed to exploit.\"}},{\"@type\":\"Question\",\"name\":\"What is range-gate pull-off (RGPO)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Range-gate pull-off is a deception technique that steals a tracking radar\u2019s range gate. The jammer copies the radar\u2019s pulses and retransmits them louder than the real echo, the radar reduces its gain so the genuine return disappears, and the jammer then delays each copy a little more so the gate walks away from the aircraft. The jammer then stops, leaving the radar tracking nothing.\"}},{\"@type\":\"Question\",\"name\":\"What is velocity-gate pull-off (VGPO)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Velocity-gate pull-off is the Doppler version of range-gate pull-off. Against a continuous-wave or pulse-Doppler radar that tracks by velocity, the jammer retransmits the signal with its frequency shifted, which the radar reads as an apparent change in speed. The velocity gate follows the false Doppler shift away from the real target.\"}},{\"@type\":\"Question\",\"name\":\"What is DRFM in electronic warfare?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"DRFM stands for digital radio frequency memory. It digitises an incoming radar signal, stores a digital copy, then reconstructs and retransmits it. Because the copy is digital it is coherent with the original, so the victim radar cannot distinguish the false return from a real one. The jammer can alter the copy\u2019s apparent range, velocity, angle and radar cross section before sending it back.\"}},{\"@type\":\"Question\",\"name\":\"Why is barrage jamming less effective than spot jamming?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Because the jammer has only so much power to spend. Spot jamming puts all of it on one frequency, and the U.S. Navy handbook puts about 85 per cent of that energy inside the victim receiver, a 0.7 dB penalty. Barrage jamming spreads the same power across many frequencies, dropping the share reaching the receiver to around 14 per cent, an 8.6 dB penalty. Barrage buys coverage against a frequency-agile radar and pays for it in effect.\"}},{\"@type\":\"Question\",\"name\":\"Can radar jamming defeat a frequency-agile radar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Spot jamming largely cannot, because the radar simply changes frequency and the jammer is left transmitting into empty spectrum. Barrage and swept jamming cover a wider band and so remain relevant, but at reduced effectiveness per frequency. Deception jamming is the more practical answer, because it works on how the radar tracks rather than on which frequency it happens to be using.\"}},{\"@type\":\"Question\",\"name\":\"Does jamming give away the jammer\u2019s position?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Noise jamming does. A transmitter radiating enough power to mask an echo is itself a strong, locatable signal, and home-on-jam missile seekers are designed to home on exactly that. Deception jamming is far quieter, because it only replies to pulses the radar has already sent, which is one of the main reasons modern electronic attack leans on it.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/stand-off-jamming-prowler-growler-ec-2-electronic-attack\/\">The Weapon That Fires Nothing<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/chaff-flares-countermeasures-how-jets-defeat-missiles\/\">How Jets Trick Missiles Into Missing<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/china-anti-stealth-radar-network-detection-firing-solution-vhf\/\">China&rsquo;s Anti-Stealth Radars: Detection Is Not a Firing Solution<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/l3harris-viper-shield-f-16-electronic-warfare-production-2026\/\">Viper Shield: The F-16&rsquo;s Digital Armour Enters Production<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Share this story A radar is a very simple liar detector. It shouts a pulse into the dark, waits, and measures how long the echo takes to come back. Distance is just time multiplied by the speed of light and halved. There is no judgement in it and no scepticism. Whatever comes back, it believes. [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":27772394,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,664],"tags":[],"class_list":["post-27773216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Radar Jamming Techniques Explained | MiGFlug<\/title>\n<meta name=\"description\" content=\"Noise versus deception jamming, spot and barrage, range-gate pull-off and DRFM. 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