{"id":72311,"date":"2026-02-26T20:20:44","date_gmt":"2026-02-26T20:20:44","guid":{"rendered":"https:\/\/one.sightlinemg.com\/defensenews\/uncategorized\/2026\/02\/26\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\/"},"modified":"2026-08-08T01:18:08","modified_gmt":"2026-08-08T01:18:08","slug":"socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones","status":"publish","type":"post","link":"https:\/\/one.sightlinemg.com\/defensenews\/unmanned\/2026\/02\/26\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\/","title":{"rendered":"SOCOM on the hunt for \u2018acoustic rainbow\u2019 tech for silencing drones"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u201cAcoustic rainbows\u201d sound psychedelic. But the idea is no acid trip: By dispersing sound waves, noisy objects can actually be made silent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That\u2019s why U.S. Special Operations Command is seeking acoustic rainbow emitters, or ARE, for its drones, according to a SOCOM Small Business Innovation Research <a href=\"https:\/\/www.highergov.com\/sbir-opportunity\/silencing-with-acoustic-rainbow-emitters-socom254-008-pre-release-sbir-2026-69c036a9\/\" target=\"_blank\" rel=\"\" title=\"https:\/\/www.highergov.com\/sbir-opportunity\/silencing-with-acoustic-rainbow-emitters-socom254-008-pre-release-sbir-2026-69c036a9\/\">solicitation<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cThe ARE would provide a means to redirect the acoustic signature of a UAS and change the frequencies of the acoustic signature,\u201d notes the solicitation, which closes March 25.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Though tactical drones can be small and hard to spot, the noise of their propellers can warn potential targets and put the drone itself at risk to hostile fire. \u201cAcoustic sensors are becoming more prolific on the battlefield,\u201d SOCOM noted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The project aims to attach acoustic rainbow emitters to Army Special Operations Forces tactical drones. The emitters \u201cshould redirect the acoustic signature of a UAS towards the atmosphere and away from the ground,\u201d the solicitation said. In addition, they \u201cshould filter the frequency of the sound emitted towards the ground to levels inaudible to the human ear.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The goal is to reduce a drone\u2019s acoustic signature by at least 50%. The device should weigh no more than 1 kilogram for a Group 1 UAS (under 20 pounds) and 3 kilograms for a Group 2 drone (under 55 pounds). The ARE must also \u201cbe colored to maintain a low visual signature.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SOCOM seems particularly interested in silent attack drones. The solicitation mentions \u201ca low-cost sensor employed from a UAS during terminal attack or when directed from the operator.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phase I of the SBIR is a Technology Readiness Level 3 feasibility study to see whether the concept is viable. Phase II calls for a prototype.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Acoustic rainbows have generated much buzz in recent years. The concept is similar to rainbows in the sky, when sunlight passing through water droplets becomes separated into different wavelengths and thus colors. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cAlthough acoustic rainbows are less well-known, they follow the same principle, being the spatial decomposition of sound in free space where waves oscillating at different frequencies propagate in different directions,\u201d explained a <a href=\"https:\/\/physicsworld.com\/a\/acoustic-rainbows-emerge-from-novel-sound-scattering-structure\/\" target=\"_blank\" rel=\"\" title=\"https:\/\/physicsworld.com\/a\/acoustic-rainbows-emerge-from-novel-sound-scattering-structure\/\">Physicsworld<\/a> article.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some animals, such as bats and even humans, have the ability to do this naturally, which helps them to localize sounds. But doing this artificially across a wide range of frequencies has been a problem. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, Danish and Spanish researchers <a href=\"https:\/\/phys.org\/news\/2025-06-3d-device-white-noise-acoustic.html\" target=\"_blank\" rel=\"\" title=\"https:\/\/phys.org\/news\/2025-06-3d-device-white-noise-acoustic.html\">unveiled<\/a> last year a 3D-printed acoustic rainbow emitter that splits broadband sound \u2014 which would normally radiate in all directions \u2014 into separate frequencies that can be individually redirected. The device works on the principle of \u201cpassive scattering, where the acoustic system is purely driven by interactions between the hard plastic surface and sound waves, requiring no electricity,\u201d noted <a href=\"https:\/\/phys.org\/news\/2025-06-3d-device-white-noise-acoustic.html\" target=\"_blank\" rel=\"\" title=\"https:\/\/phys.org\/news\/2025-06-3d-device-white-noise-acoustic.html\">Phys.org<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u201cAcoustic rainbows\u201d sound psychedelic. But the idea is no acid trip: By dispersing sound waves, noisy objects can actually be made silent.<\/p>\n","protected":false},"author":7,"featured_media":111743,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_canonical":"","_acf":"","_yoast_wpseo_primary_category":27,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_smg_distribution_targets":{"2":{"categories":["techwatch"],"primary_category":"techwatch"}}},"categories":[76,160,29,12,49,36,27],"tags":[],"coauthors":[3415],"class_list":["post-72311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-warfare-symposium","category-daily-news-roundup","category-digital-show-dailies","category-industry","category-techwatch","category-newsletters","category-unmanned"],"acf":{"subheadline":"","legacy_arc_id":"KFQ7DUSYHRCR5NAO5OTESXSSHA","arc_canonical_url":"\/unmanned\/2026\/02\/26\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\/","remove_feature_photo":false,"is_sponsored":false,"subtype":"","redirect_url":"","disable_inline_ads":false,"native_logo_pretext":"Presented By:"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>SOCOM on the hunt for \u2018acoustic rainbow\u2019 tech for silencing drones - Defense News<\/title>\n<meta name=\"description\" content=\"\u201cAcoustic rainbows\u201d sound psychedelic. 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But the idea is no acid trip: By dispersing sound waves, noisy objects can actually be made silent.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/one.sightlinemg.com\/defensenews\/unmanned\/2026\/02\/26\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\/\" \/>\n<meta property=\"og:site_name\" content=\"Defense News\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-26T20:20:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-08T01:18:08+00:00\" \/>\n<meta name=\"author\" content=\"Michael Peck\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Peck\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\n\t    \"@context\": \"https:\\\/\\\/schema.org\",\n\t    \"@graph\": [\n\t        {\n\t            \"@type\": \"Article\",\n\t            \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/#article\",\n\t            \"isPartOf\": {\n\t                \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/\"\n\t            },\n\t            \"author\": {\n\t                \"name\": \"migration\",\n\t                \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/#\\\/schema\\\/person\\\/cc76c831bb37a926738c8391fca7a3b1\"\n\t            },\n\t            \"headline\": \"SOCOM on the hunt for \u2018acoustic rainbow\u2019 tech for silencing drones\",\n\t            \"datePublished\": \"2026-02-26T20:20:44+00:00\",\n\t            \"dateModified\": \"2026-08-08T01:18:08+00:00\",\n\t            \"mainEntityOfPage\": {\n\t                \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/\"\n\t            },\n\t            \"wordCount\": 449,\n\t            \"commentCount\": 0,\n\t            \"publisher\": {\n\t                \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/#organization\"\n\t            },\n\t            \"image\": {\n\t                \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/#primaryimage\"\n\t            },\n\t            \"thumbnailUrl\": \"https:\\\/\\\/one.sightlinemg.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/9522621.jpg.jpg\",\n\t            \"articleSection\": [\n\t                \"Air Warfare Symposium\",\n\t                \"Daily News Roundup\",\n\t                \"Digital Show Dailies\",\n\t                \"Industry\",\n\t                \"MilTech\",\n\t                \"Newsletters\",\n\t                \"Unmanned\"\n\t            ],\n\t            \"inLanguage\": \"en-US\",\n\t            \"potentialAction\": [\n\t                {\n\t                    \"@type\": \"CommentAction\",\n\t                    \"name\": \"Comment\",\n\t                    \"target\": [\n\t                        \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/#respond\"\n\t                    ]\n\t                }\n\t            ]\n\t        },\n\t        {\n\t            \"@type\": \"WebPage\",\n\t            \"@id\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/\",\n\t            \"url\": \"https:\\\/\\\/one.sightlinemg.com\\\/defensenews\\\/unmanned\\\/2026\\\/02\\\/26\\\/socom-on-the-hunt-for-acoustic-rainbow-tech-for-silencing-drones\\\/\",\n\t            \"name\": \"SOCOM on the hunt for \u2018acoustic rainbow\u2019 tech for silencing drones - 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