{"id":2904,"date":"2024-07-10T07:00:33","date_gmt":"2024-07-10T07:00:33","guid":{"rendered":"https:\/\/nfc-readers.com\/?p=2904"},"modified":"2024-07-10T07:02:35","modified_gmt":"2024-07-10T07:02:35","slug":"can-uhf-rfid-do-high-precision-positioning","status":"publish","type":"post","link":"https:\/\/nfc-readers.com\/vi\/can-uhf-rfid-do-high-precision-positioning\/","title":{"rendered":"Li\u1ec7u UHF RFID c\u00f3 th\u1ec3 \u0111\u1ecbnh v\u1ecb ch\u00ednh x\u00e1c cao kh\u00f4ng?"},"content":{"rendered":"<div><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Chuy\u1ec3n \u0111\u1ed5i m\u1ee5c l\u1ee5c\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Chuy\u1ec3n \u0111\u1ed5i<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nfc-readers.com\/vi\/can-uhf-rfid-do-high-precision-positioning\/#Can_UHF_RFID_be_used_for_high-precision_positioning\" title=\"C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng RFID UHF \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao kh\u00f4ng?\">C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng RFID UHF \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nfc-readers.com\/vi\/can-uhf-rfid-do-high-precision-positioning\/#_What_scenarios_are_suitable_for_UHF_RFID_high-precision_positioning\" title=\"\u00a0Nh\u1eefng t\u00ecnh hu\u1ed1ng n\u00e0o ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecbnh v\u1ecb ch\u00ednh x\u00e1c cao RFID UHF?\">\u00a0Nh\u1eefng t\u00ecnh hu\u1ed1ng n\u00e0o ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecbnh v\u1ecb ch\u00ednh x\u00e1c cao RFID UHF?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Can_UHF_RFID_be_used_for_high-precision_positioning\"><\/span>C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng RFID UHF \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div><\/div>\n<div>Tr\u01b0\u1edbc ti\u00ean, t\u00f4i xin tr\u1ea3 l\u1eddi b\u1ea1n. UHF RFID c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, nh\u01b0ng \u0111\u1ed9 ch\u00ednh x\u00e1c ch\u1ec9 kho\u1ea3ng 1 m\u00e9t.<\/div>\n<div><\/div>\n<div>UHF RFID \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t gi\u1ea3i ph\u00e1p \u0111\u1ecbnh v\u1ecb. Thi\u1ebft b\u1ecb c\u1ed1t l\u00f5i l\u00e0 \u0111\u1ea7u \u0111\u1ecdc s\u1eed d\u1ee5ng \u0103ng-ten m\u1ea3ng pha. Nguy\u00ean l\u00fd c\u1ee7a \u0103ng-ten m\u1ea3ng pha \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 chi ti\u1ebft trong cu\u1ed1n s\u00e1ch \u201cS\u1ea3n ph\u1ea9m v\u00e0 \u1ee9ng d\u1ee5ng c\u00f4ng ngh\u1ec7 UHF RFID cho Internet v\u1ea1n v\u1eadt\u201d c\u1ee7a Gan Quan. Ch\u00fang t\u00f4i s\u1ebd tr\u00edch d\u1eabn n\u1ed9i dung c\u00f3 li\u00ean quan.<\/div>\n<div><\/div>\n<div><\/div>\n<div>Nguy\u00ean l\u00fd c\u1ee7a \u0103ng-ten m\u1ea3ng pha<\/div>\n<div><\/div>\n<div><\/div>\n<div>\u0102ng-ten m\u1ea3ng pha, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0103ng-ten m\u1ea3ng pha, l\u00e0 \u0103ng-ten thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng c\u1ee7a m\u1eabu \u0111\u1ecbnh h\u01b0\u1edbng b\u1eb1ng c\u00e1ch \u0111i\u1ec1u khi\u1ec3n pha c\u1ea5p c\u1ee7a \u0111\u01a1n v\u1ecb b\u1ee9c x\u1ea1 trong \u0103ng-ten m\u1ea3ng. \u0110i\u1ec1u khi\u1ec3n pha c\u00f3 th\u1ec3 thay \u0111\u1ed5i h\u01b0\u1edbng c\u1ee7a gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a m\u1eabu \u0111\u1ecbnh h\u01b0\u1edbng \u0103ng-ten \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c \u0111\u00edch qu\u00e9t ch\u00f9m tia. C\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u00e0 \u0103ng-ten truy\u1ec1n th\u1ed1ng ch\u1ec9 c\u00f3 m\u1ed9t m\u1eabu b\u1ee9c x\u1ea1 c\u1ed1 \u0111\u1ecbnh, trong khi \u0103ng-ten m\u1ea3ng c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u m\u1eabu b\u1ee9c x\u1ea1 theo c\u00e1c h\u01b0\u1edbng kh\u00e1c nhau. Khi \u0103ng-ten m\u1ea3ng pha \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ea7n s\u1ed1 c\u1ef1c cao <a href=\"https:\/\/nfc-readers.com\/vi\/Wholesale\/rfid-nfc-reader\/\">H\u1ec7 th\u1ed1ng RFID<\/a>, m\u1ed9t \u0103ng-ten c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh nhi\u1ec1u \u0103ng-ten theo c\u00e1c h\u01b0\u1edbng kh\u00e1c nhau. H\u00ecnh sau \u0111\u00e2y cho th\u1ea5y s\u01a1 \u0111\u1ed3 b\u1ee9c x\u1ea1 c\u1ee7a m\u1ed9t c\u1ed5ng v\u1edbi m\u1ed9t \u0103ng-ten m\u1ea3ng pha. Tr\u1ee5c b\u1ee9c x\u1ea1 th\u00f9y ch\u00ednh c\u1ee7a \u0103ng-ten ban \u0111\u1ea7u l\u00e0 \u03b8=0\u00b0. Sau khi pha c\u1ee7a \u0111\u01a1n v\u1ecb b\u1ee9c x\u1ea1 \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh trong \u0103ng-ten m\u1ea3ng \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh, tr\u1ee5c b\u1ee9c x\u1ea1 th\u00f9y ch\u00ednh s\u1ebd l\u1ec7ch v\u00e0 \u0111\u1ed9 l\u1ec7ch t\u1ed1i \u0111a c\u00f3 th\u1ec3 l\u00e0 45\u00b0. So v\u1edbi gi\u1ea3i ph\u00e1p truy\u1ec1n th\u1ed1ng, ph\u1ea1m vi ph\u1ee7 s\u00f3ng c\u1ee7a c\u1ed5ng m\u1ea3ng pha s\u1eed d\u1ee5ng gi\u1ea3i ph\u00e1p \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong h\u00ecnh b\u00ean d\u01b0\u1edbi \u0111\u00e3 \u0111\u01b0\u1ee3c t\u0103ng l\u00ean r\u1ea5t nhi\u1ec1u. G\u00f3c b\u1ee9c x\u1ea1 3dB ban \u0111\u1ea7u l\u00e0 30\u00b0, v\u00e0 b\u00e2y gi\u1edd \u0111\u00e3 tr\u1edf th\u00e0nh 120\u00b0.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<figure id=\"attachment_2905\" aria-describedby=\"caption-attachment-2905\" style=\"width: 451px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2905\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-300x208.png\" alt=\"v\u1ecb tr\u00ed RFID\" width=\"451\" height=\"313\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-300x208.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-18x12.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position.png 355w\" sizes=\"auto, (max-width: 451px) 100vw, 451px\" \/><figcaption id=\"caption-attachment-2905\" class=\"wp-caption-text\">v\u1ecb tr\u00ed RFID<\/figcaption><\/figure>\n<\/div>\n<div>S\u01a1 \u0111\u1ed3 b\u1ee9c x\u1ea1 c\u1ed5ng \u0103ng-ten m\u1ea3ng pha<\/div>\n<div><\/div>\n<div>Ho\u1ea1t \u0111\u1ed9ng c\u1ee5 th\u1ec3 c\u1ee7a c\u1ed5ng m\u1ea3ng pha c\u00f3 th\u1ec3 hi\u1ec3u l\u00e0 \u0111\u1ea7u \u0111\u1ecdc m\u1ed9t c\u1ed5ng tr\u1edf th\u00e0nh \u0111\u1ea7u \u0111\u1ecdc nhi\u1ec1u c\u1ed5ng (s\u1ed1 l\u01b0\u1ee3ng k\u1ebft h\u1ee3p pha t\u01b0\u01a1ng \u1ee9ng v\u1edbi s\u1ed1 l\u01b0\u1ee3ng c\u1ed5ng). \u0110\u1ea7u \u0111\u1ecdc m\u1ed9t c\u1ed5ng ban \u0111\u1ea7u ch\u1ec9 c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u0103ng-ten v\u00e0 ph\u1ea1m vi b\u1ee9c x\u1ea1 l\u00e0 c\u1ed1 \u0111\u1ecbnh, trong khi \u0111\u1ea7u \u0111\u1ecdc nhi\u1ec1u c\u1ed5ng c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi nhi\u1ec1u \u0103ng-ten v\u00e0 m\u1ed7i \u0103ng-ten c\u00f3 ph\u1ea1m vi b\u1ee9c x\u1ea1 kh\u00e1c nhau. \u0110\u1ea7u \u0111\u1ecdc nhi\u1ec1u c\u1ed5ng n\u00e0y c\u00f3 th\u1ec3 ch\u1ecdn khu v\u1ef1c c\u1ea7n qu\u00e9t theo nhu c\u1ea7u v\u00e0 kh\u1edfi \u0111\u1ed9ng c\u1ed5ng t\u01b0\u01a1ng \u1ee9ng \u0111\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u qua \u0103ng-ten t\u01b0\u01a1ng \u1ee9ng \u0111\u1ec3 ph\u1ee7 s\u00f3ng khu v\u1ef1c \u0111\u00e3 ch\u1ec9 \u0111\u1ecbnh.<\/div>\n<div><\/div>\n<div><\/div>\n<div>Ch\u1ee9c n\u0103ng \u0111\u1ecbnh v\u1ecb anten m\u1ea3ng pha<\/div>\n<div><\/div>\n<div>V\u1ec1 ch\u1ee9c n\u0103ng \u0111\u1ecbnh v\u1ecb c\u1ee7a UHF<a href=\"https:\/\/nfc-readers.com\/vi\/Wholesale\/rfid-nfc-reader\/\"> \u0110\u1ea7u \u0111\u1ecdc RFID<\/a>, h\u00e3y l\u1ea5y hai c\u1ed5ng m\u1ea3ng pha ph\u1ed5 bi\u1ebfn tr\u00ean th\u1ecb tr\u01b0\u1eddng: xSpan v\u00e0 xArray c\u1ee7a Impinj l\u00e0m v\u00ed d\u1ee5.<\/div>\n<div><\/div>\n<div>xArray l\u00e0 m\u1ed9t c\u1ed5ng m\u1ea3ng pha vu\u00f4ng. Khi xArray \u0111\u01b0\u1ee3c treo tr\u00ean m\u00e1i nh\u00e0, v\u00f9ng ph\u1ee7 s\u00f3ng c\u1ee7a n\u00f3 l\u00e0 m\u1ed9t h\u00ecnh tr\u00f2n, v\u1edbi t\u1ed5ng c\u1ed9ng 8 sector v\u00e0 52 v\u00f9ng b\u1ee9c x\u1ea1. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u00e0 m\u1ed9t \u0111\u1ea7u \u0111\u1ecdc 52 c\u1ed5ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi 52 \u0103ng-ten c\u00f3 c\u00e1c v\u00f9ng b\u1ee9c x\u1ea1 kh\u00e1c nhau.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2906\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-300x148.png\" alt=\"\" width=\"513\" height=\"253\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-300x148.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-18x9.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-600x295.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID.png 728w\" sizes=\"auto, (max-width: 513px) 100vw, 513px\" \/><\/div>\n<p>&nbsp;<\/p>\n<div>M\u1eabu ch\u00f9m tia xArray<\/div>\n<div><\/div>\n<div>xSpan l\u00e0 m\u1ed9t c\u1ed5ng m\u1ea3ng pha h\u00ecnh ch\u1eef nh\u1eadt. C\u1ed5ng xSpan c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c xem nh\u01b0 m\u1ed9t phi\u00ean b\u1ea3n \u0111\u01a1n gi\u1ea3n h\u00f3a c\u1ee7a xArray. Khi xSpan \u0111\u01b0\u1ee3c treo tr\u00ean m\u00e1i nh\u00e0, khu v\u1ef1c m\u00e0 n\u00f3 bao ph\u1ee7 l\u00e0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi t\u1ed5ng c\u1ed9ng 13 v\u00f9ng b\u1ee9c x\u1ea1. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u00e0 m\u1ed9t \u0111\u1ea7u \u0111\u1ecdc 13 c\u1ed5ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0103ng-ten \u1edf 13 v\u00f9ng b\u1ee9c x\u1ea1 kh\u00e1c nhau.<\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2907\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-300x149.png\" alt=\"\" width=\"503\" height=\"250\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-300x149.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-18x9.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-600x298.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position.png 699w\" sizes=\"auto, (max-width: 503px) 100vw, 503px\" \/><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div>M\u1eabu d\u1ea7m xSpan<\/div>\n<div><\/div>\n<div>Trong m\u00f4i tr\u01b0\u1eddng th\u1ef1c t\u1ebf, c\u00e1c v\u00f9ng b\u1ee9c x\u1ea1 c\u1ee7a c\u00e1c s\u1ed1 li\u1ec1n k\u1ec1 ch\u1ed3ng l\u00ean nhau. Khi c\u00f9ng m\u1ed9t th\u1ebb \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong nhi\u1ec1u v\u00f9ng b\u1ee9c x\u1ea1 \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1, v\u1ecb tr\u00ed c\u1ee5 th\u1ec3 c\u1ee7a th\u1ebb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n theo k\u00edch th\u01b0\u1edbc RSSI. Qu\u00e1 tr\u00ecnh t\u00ednh to\u00e1n l\u00e0 chuy\u1ec3n \u0111\u1ed5i ch\u00eanh l\u1ec7ch RSSI th\u00e0nh ch\u00eanh l\u1ec7ch kho\u1ea3ng c\u00e1ch, sau \u0111\u00f3 tri\u1ec3n khai th\u00f4ng qua thu\u1eadt to\u00e1n \u0111\u1ecbnh v\u1ecb \u0111a \u0111i\u1ec3m. T\u1ea5t nhi\u00ean, th\u1ebb c\u00f3 kh\u1ea3 n\u0103ng r\u01a1i v\u00e0o v\u00f9ng b\u1ee9c x\u1ea1 c\u00f3 gi\u00e1 tr\u1ecb RSSI l\u1edbn nh\u1ea5t.<\/div>\n<div><\/div>\n<div>Ch\u1ee9c n\u0103ng l\u1edbn nh\u1ea5t c\u1ee7a c\u1ed5ng phased array l\u00e0 \u0111\u1ecbnh v\u1ecb, \u0111\u00e1nh gi\u00e1 v\u1ecb tr\u00ed v\u00e0 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. H\u00ecnh sau \u0111\u00e2y cho th\u1ea5y chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a th\u1ebb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c theo d\u00f5i b\u1edfi xSpan v\u00e0 xArray. Trong s\u1ed1 \u0111\u00f3, xSpan ch\u1ec9 c\u00f3 th\u1ec3 theo d\u00f5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a th\u1ebb theo m\u1ed9t h\u01b0\u1edbng tr\u1ee5c, trong khi xArray c\u00f3 th\u1ec3 theo d\u00f5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a th\u1ebb theo nhi\u1ec1u h\u01b0\u1edbng kh\u00e1c nhau.<\/div>\n<div><\/div>\n<\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2908\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-300x140.png\" alt=\"\" width=\"493\" height=\"230\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-300x140.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-18x8.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-600x280.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56.png 726w\" sizes=\"auto, (max-width: 493px) 100vw, 493px\" \/><\/div>\n<div><\/div>\n<div>\n<div>Theo d\u00f5i h\u01b0\u1edbng c\u1ed5ng m\u1ea3ng pha<\/div>\n<div><\/div>\n<div><\/div>\n<div>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o theo d\u00f5i \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian th\u1ef1c, c\u1ea7n \u0111\u1ea3m b\u1ea3o t\u1ed1c \u0111\u1ed9 chuy\u1ec3n m\u1ea1ch \u0103ng-ten \u0111\u1ee7 nhanh. Ngay c\u1ea3 khi chuy\u1ec3n m\u1ea1ch l\u00e0 50ms m\u1ed7i l\u1ea7n, ph\u1ea3i m\u1ea5t 2,5 gi\u00e2y \u0111\u1ec3 qu\u00e9t t\u1ea5t c\u1ea3 c\u00e1c v\u00f9ng b\u1ee9c x\u1ea1 c\u1ee7a xArray. Do \u0111\u00f3, trong \u1ee9ng d\u1ee5ng theo d\u00f5i \u0111\u1ed1i t\u01b0\u1ee3ng, s\u1ed1 l\u01b0\u1ee3ng th\u1ebb trong tr\u01b0\u1eddng ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o. N\u1ebfu c\u1ea7n theo d\u00f5i \u0111\u1ed9 ch\u00ednh x\u00e1c cao, s\u1ed1 l\u01b0\u1ee3ng th\u1ebb kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 20; n\u1ebfu mu\u1ed1n \u0111\u1ea1t \u0111\u01b0\u1ee3c theo d\u00f5i t\u1ed1c \u0111\u1ed9 cao, s\u1ed1 l\u01b0\u1ee3ng th\u1ebb kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 50.<\/div>\n<div><\/div>\n<div>Trong c\u00e1c th\u1eed nghi\u1ec7m th\u1ef1c t\u1ebf, c\u00f3 m\u1ed9t s\u1ed1 l\u1ed7i nh\u1ea5t \u0111\u1ecbnh do nhi\u1ec1u l\u00fd do kh\u00e1c nhau. D\u1eef li\u1ec7u \u0111o \u0111\u01b0\u1ee3c trong m\u00f4i tr\u01b0\u1eddng l\u00fd t\u01b0\u1edfng kh\u00f4ng b\u1ecb che khu\u1ea5t v\u00e0 ph\u1ea3n x\u1ea1 l\u00e0: c\u00f3 l\u1ed7i x\u00e1c su\u1ea5t 85% trong ph\u1ea1m vi 1,5 m\u00e9t. L\u1ed7i s\u1ebd l\u1edbn h\u01a1n trong c\u00e1c m\u00f4i tr\u01b0\u1eddng ph\u1ee9c t\u1ea1p, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c c\u1eeda h\u00e0ng b\u00e1n l\u1ebb c\u00f3 ph\u1ea3n x\u1ea1 tr\u00ean k\u1ec7 v\u00e0 t\u01b0\u1eddng, c\u0169ng nh\u01b0 chi\u1ec1u cao x\u1ebfp ch\u1ed3ng v\u00e0 \u0111\u1eb7t th\u1ebb, \u0111i\u1ec1u n\u00e0y s\u1ebd \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a th\u1eed nghi\u1ec7m. Tuy nhi\u00ean, so v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 truy\u1ec1n th\u1ed1ng, vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c c\u1ed5ng m\u1ea3ng pha c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 s\u1ef1 ti\u1ec7n l\u1ee3i c\u1ee7a vi\u1ec7c \u0111\u1ecbnh v\u1ecb v\u00e0 t\u00ecm ki\u1ebfm \u0111\u1ed1i t\u01b0\u1ee3ng.<\/div>\n<div><\/div>\n<div>\n<div>Vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a nh\u00f3m nghi\u00ean c\u1ee9u \u0110\u1ea1i h\u1ecdc Giao th\u00f4ng Th\u01b0\u1ee3ng H\u1ea3i ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c ph\u1ea3n \u00e1nh \u1edf c\u1ea5p \u0111\u1ed9 thu\u1eadt to\u00e1n. Trong gi\u1ea3i ph\u00e1p c\u1ee7a h\u1ecd, tr\u01b0\u1edbc ti\u00ean h\u1ecd c\u1ea7n \u0111\u1ecdc th\u00f4ng tin pha c\u1ee7a t\u00edn hi\u1ec7u ph\u1ea3n x\u1ea1 th\u1ebb th\u00f4ng qua \u0103ng-ten m\u1ea3ng \u0111\u1ea7u \u0111\u1ecdc c\u1ee7a c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t nh\u01b0 Impinj, sau \u0111\u00f3 t\u1ed1i \u01b0u h\u00f3a thu\u1eadt to\u00e1n \u0111\u1ecbnh v\u1ecb d\u1ef1a tr\u00ean th\u00f4ng tin pha.<\/div>\n<div><\/div>\n<div>\u0110\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb \u1edf m\u1ee9c centimet \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o trong tin t\u1ee9c tr\u01b0\u1edbc \u0111\u00e2y l\u00e0 hi\u1ec7u \u1ee9ng \u0111\u1ea1t \u0111\u01b0\u1ee3c trong \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng \u0111\u1ed1i l\u00fd t\u01b0\u1edfng. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c nh\u01b0 v\u1eady, c\u1ea7n c\u00f3 nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n c\u1ee5 th\u1ec3. N\u1ebfu \u1edf trong m\u00f4i tr\u01b0\u1eddng chung, d\u1ef1a tr\u00ean vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a thu\u1eadt to\u00e1n, \u0111\u00e2y l\u00e0 m\u1ed9t b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 l\u1edbn \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a gi\u1ea3i ph\u00e1p \u0111\u1ecbnh v\u1ecb RFID UHF t\u1eeb kho\u1ea3ng 1 m\u00e9t \u0111\u1ebfn m\u1ee9c decimet.<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<h2><span class=\"ez-toc-section\" id=\"_What_scenarios_are_suitable_for_UHF_RFID_high-precision_positioning\"><\/span>\u00a0Nh\u1eefng t\u00ecnh hu\u1ed1ng n\u00e0o ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecbnh v\u1ecb ch\u00ednh x\u00e1c cao RFID UHF?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div><\/div>\n<div>\u0110\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a UHF RFID l\u00e0 kho\u1ea3ng 1m, c\u0169ng thu\u1ed9c v\u1ec1 lo\u1ea1i c\u00f4ng ngh\u1ec7 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao. Hi\u1ec7n t\u1ea1i, c\u00f4ng ngh\u1ec7 \u0111\u1ecbnh v\u1ecb kh\u00f4ng d\u00e2y c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb t\u1ed1t nh\u1ea5t tr\u00ean th\u1ecb tr\u01b0\u1eddng l\u00e0 UWB, c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb \u1edf m\u1ee9c centimet trong m\u00f4i tr\u01b0\u1eddng l\u00fd t\u01b0\u1edfng, nh\u01b0ng trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, c\u00f3 kh\u1ea3 n\u0103ng l\u00e0 \u1edf m\u1ee9c decimet; trong khi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a Bluetooth AoA ch\u1ec9 \u1edf m\u1ee9c m\u00e9t, v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a c\u00f4ng ngh\u1ec7 \u0111\u1ecbnh v\u1ecb th\u1ebf h\u1ec7 ti\u1ebfp theo c\u1ee7a Bluetooth &quot;Channel Sounding&quot; c\u0169ng kho\u1ea3ng 1m, v\u00ec v\u1eady \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a UHF RFID kh\u00f4ng t\u1ec7.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>","protected":false},"excerpt":{"rendered":"<p>C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng UHF RFID \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao kh\u00f4ng? Tr\u01b0\u1edbc ti\u00ean, t\u00f4i xin tr\u1ea3 l\u1eddi b\u1ea1n. UHF RFID c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, nh\u01b0ng \u0111\u1ed9 ch\u00ednh x\u00e1c ch\u1ec9 kho\u1ea3ng 1 m\u00e9t. UHF RFID \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t gi\u1ea3i ph\u00e1p \u0111\u1ecbnh v\u1ecb. Thi\u1ebft b\u1ecb c\u1ed1t l\u00f5i l\u00e0 \u0111\u1ea7u \u0111\u1ecdc s\u1eed d\u1ee5ng \u0103ng-ten m\u1ea3ng pha. Nguy\u00ean l\u00fd c\u1ee7a \u0103ng-ten m\u1ea3ng pha [\u2026]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2904","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts\/2904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/comments?post=2904"}],"version-history":[{"count":2,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts\/2904\/revisions"}],"predecessor-version":[{"id":2910,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts\/2904\/revisions\/2910"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/media?parent=2904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/categories?post=2904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/tags?post=2904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}