{"id":3576,"date":"2025-09-20T00:39:23","date_gmt":"2025-09-20T00:39:23","guid":{"rendered":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?p=3576"},"modified":"2025-09-20T03:24:22","modified_gmt":"2025-09-20T03:24:22","slug":"rf-biomarker-sensing-on-commodity-phones-toward-k9-replacement-via-wi-fi-ble-and-uwb-fusion","status":"publish","type":"post","link":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?p=3576","title":{"rendered":"RF Biomarker Sensing on Commodity Phones: Toward K9 Replacement via Wi-Fi, BLE and UWB Fusion"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-spectrcyde wp-block-embed-spectrcyde\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"c8yuwKCKRu\"><a href=\"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?page_id=3572\">RF Biomarker Sensing on Commodity Phones: Toward K9 Replacement via Wi-Fi, BLE and UWB Fusion<\/a><\/blockquote><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;RF Biomarker Sensing on Commodity Phones: Toward K9 Replacement via Wi-Fi, BLE and UWB Fusion&#8221; &#8212; Spectrcyde\" src=\"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?page_id=3572&#038;embed=true#?secret=yACxFEsvLx#?secret=c8yuwKCKRu\" data-secret=\"c8yuwKCKRu\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Locating trapped or unconscious victims under rubble, behind walls or in smoky environments is a critical challenge<br>for first responders. While trained dogs (K9) excel at search<br>tasks, they are expensive and have limited availability. Recent<br>advances in commodity wireless hardware allow smartphones to<br>sense vital signs without line-of-sight by analyzing Wi-Fi channel<br>state information (CSI), Bluetooth Low Energy (BLE) received<br>signal strength (RSSI) and Ultra-Wideband (UWB) channel<br>impulse responses. Prior work on Wi-Fi sensing has shown<br>that scattering models can achieve robust performance even<br>with non-line-of-sight occlusion[1], and UWB radars can detect<br>human presence in NLOS conditions using machine learning[2].<br>We propose RF Biomarker Sense, a fused sensing pipeline that<br>combines CSI, BLE and UWB features on commodity phones to<br>detect human presence and estimate triage priority in occluded<br>scenarios. Our experiments demonstrate that fusion yields up to<br>a 12 % increase in area under the ROC curve (AUC) relative to<br>individual modalities and maintains operational detection under<br>occlusion distances up to 8 m. This paper describes the system<br>design, fusion algorithm and evaluation across distance, motion<br>and clutter conditions indoors and outdoors. Locating trapped or unconscious victims under rubble, behind walls or in smoky environments is a critical challenge<br>for first responders. While trained dogs (K9) excel at search<br>tasks, they are expensive and have limited availability. Recent<br>advances in commodity wireless hardware allow smartphones to<br>sense vital signs without line-of-sight by analyzing Wi-Fi channel<br>state information (CSI), Bluetooth Low Energy (BLE) received<br>signal strength (RSSI) and Ultra-Wideband (UWB) channel<br>impulse responses. Prior work on Wi-Fi sensing has shown<br>that scattering models can achieve robust performance even<br>with non-line-of-sight occlusion[1], and UWB radars can detect<br>human presence in NLOS conditions using machine learning[2].<br>We propose RF Biomarker Sense, a fused sensing pipeline that<br>combines CSI, BLE and UWB features on commodity phones to<br>detect human presence and estimate triage priority in occluded<br>scenarios. Our experiments demonstrate that fusion yields up to<br>a 12 % increase in area under the ROC curve (AUC) relative to<br>individual modalities and maintains operational detection under<br>occlusion distances up to 8 m. This paper describes the system<br>design, fusion algorithm and evaluation across distance, motion<br>and clutter conditions indoors and outdoors.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Locating trapped or unconscious victims under rubble, behind walls or in smoky environments is a critical challengefor first responders. While trained dogs (K9) excel at searchtasks, they are expensive and have limited availability. Recentadvances in commodity wireless hardware allow smartphones tosense vital signs without line-of-sight by analyzing Wi-Fi channelstate information (CSI), Bluetooth Low Energy (BLE)&hellip;&nbsp;<a href=\"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?p=3576\" rel=\"bookmark\"><span class=\"screen-reader-text\">RF Biomarker Sensing on Commodity Phones: Toward K9 Replacement via Wi-Fi, BLE and UWB Fusion<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3574,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[10],"tags":[],"class_list":["post-3576","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-signal_scythe"],"_links":{"self":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/3576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3576"}],"version-history":[{"count":2,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/3576\/revisions"}],"predecessor-version":[{"id":3578,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/3576\/revisions\/3578"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/media\/3574"}],"wp:attachment":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}