{"id":4637,"date":"2015-12-07T11:09:10","date_gmt":"2015-12-07T04:09:10","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=4637"},"modified":"2017-10-02T09:50:08","modified_gmt":"2017-10-02T02:50:08","slug":"da-tac-ke-hoa-chu-dong-bien-doi-de-hap-thu-tin-hieu-radar","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/da-tac-ke-hoa-chu-dong-bien-doi-de-hap-thu-tin-hieu-radar\/","title":{"rendered":"Da t\u1eafc k\u00e8 hoa ch\u1ee7 \u0111\u1ed9ng bi\u1ebfn \u0111\u1ed5i \u0111\u1ec3 h\u1ea5p th\u1ee5 t\u00edn hi\u1ec7u radar"},"content":{"rendered":"

M\u1ed9t nh\u00f3m c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7 Huazhong, Trung Qu\u1ed1c \u0111\u00e3 c\u00f4ng b\u1ed1 chi ti\u1ebft v\u1ec1 v\u1eadt li\u1ec7u bi\u1ebfn h\u00ecnh gi\u1ed1ng nh\u01b0 t\u1eafc k\u00e8 hoa, c\u00f3 ph\u1ea3n \u1ee9ng t\u1ef1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 h\u1ea5p th\u1ee5 c\u00e1c t\u00edn hi\u1ec7u radar v\u1edbi t\u1ea7n s\u1ed1 kh\u00e1c nhau. V\u1eadt li\u1ec7u AFSS – “b\u1ec1 m\u1eb7t ch\u1ecdn l\u1ecdc t\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng” – c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u1ee7 l\u00ean v\u1ecf ngo\u00e0i c\u1ee7a m\u00e1y bay t\u00e0ng h\u00ecnh khi\u1ebfn n\u00f3 tr\u1edf n\u00ean v\u00f4 h\u00ecnh tr\u01b0\u1edbc c\u00e1c k\u1ef9 thu\u1eadt ph\u00e1t hi\u1ec7n \u0111\u1eb7c th\u00f9<\/strong><\/p>\n

\"\"<\/p>\n

C\u00f4ng ngh\u1ec7 t\u00e0ng h\u00ecnh hi\u1ec7n nay ch\u1ec9 h\u1ecdat \u0111\u1ed9ng ch\u1ed1ng radar trong ph\u1ea1m vi t\u1ea7n s\u1ed1 si\u00eau cao (SHF n\u1eb1m trong d\u1ea3i t\u1ea7n 3 GHz t\u1edbi 30 GHz.). Nh\u01b0ng, m\u00e1y bay r\u1ea5t d\u1ec5 b\u1ecb radar ph\u00e1t hi\u1ec7n v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng m\u1ee5c ti\u00eau ho\u1ea1t \u0111\u1ed9ng trong ph\u1ea1m vi t\u1ea7n s\u1ed1 c\u1ef1c cao (UHF n\u1eb1m trong kho\u1ea3ng 300 MHz t\u1edbi 3 3,000 MHz).<\/p>\n

V\u1eadt li\u1ec7u AFSS tr\u00ean th\u1ef1c t\u1ebf s\u1ebd t\u1ef1 \u0111i\u1ec1u ch\u1ec9nh cho ph\u00f9 h\u1ee3p v\u00e0 h\u1ea5p th\u1ee5 t\u1ea7n s\u1ed1 b\u01b0\u1edbc s\u00f3ng d\u00e0i khi \u0111\u1ed9 d\u00e0i b\u01b0\u1edbc s\u00f3ng \u0111\u00f3 b\u1ecb ph\u00e1t hi\u1ec7n, th\u00fac \u0111\u1ea9y s\u1ef1 thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng cho m\u00e1y bay. C\u00f4ng ngh\u1ec7 k\u1ebft h\u1ee3p v\u1edbi m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng kh\u00e1c nhau b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ed1t thu nh\u1ecf tri\u1ec7t \u0111\u00f3ng vai tr\u00f2 nh\u01b0 c\u00e1c \u0111i\u1ec7n tr\u1edf b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb.<\/p>\n

Khi k\u1ebft h\u1ee3p v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 t\u00e0ng h\u00ecnh kh\u00e1c nh\u01b0 nh\u1eefng thi\u1ebft k\u1ebf h\u00ecnh h\u1ecdc k\u1ef3 l\u1ea1 l\u00e0m ch\u1ec7ch h\u01b0\u1edbng s\u00f3ng radar, c\u00f4ng ngh\u1ec7 AFSS c\u00f3 th\u1ec3 l\u00e0 b\u01b0\u1edbc ti\u1ebfn l\u1edbn ti\u1ebfp theo \u0111\u1ec3 ph\u00e1t tri\u1ec3n m\u00e1y bay t\u00e0ng h\u00ecnh.<\/p>\n

AFSS c\u0169ng l\u00e0 v\u1eadt li\u1ec7u si\u00eau m\u1ecfng, ch\u1ec9 d\u00e0y 7,8 mm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m l\u1edbp ph\u1ee7 kim lo\u1ea1i v\u00e0 c\u00e1c b\u1ec1 m\u1eb7t kh\u00e1c. N\u00f3 bao g\u1ed3m hai l\u1edbp \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi m\u1ed9t l\u1edbp t\u1ed5 ong th\u1ee9 ba ph\u00e2n t\u00e1ch b\u1ec1 m\u1eb7t b\u00ean d\u01b0\u1edbi. M\u1eabu AFSS \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh c\u00f3 kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 t\u1ea7n s\u1ed1 v\u00f4 tuy\u1ebfn dao \u0111\u1ed9ng t\u1eeb 0,7 \u0111\u1ebfn 1,9 GHz, l\u00e0m gi\u1ea3m h\u1ec7 s\u1ed1 ph\u1ea3n x\u1ea1 t\u1eeb 10 \u0111\u1ebfn 40dB.<\/p>\n

Theo k\u1ebft lu\u1eadn c\u1ee7a c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u, khi thi\u1ebft b\u1ecb ph\u00e1t hi\u1ec7n t\u00edn hi\u1ec7u radar ti\u1ebfp t\u1ee5c \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn, v\u1eadt li\u1ec7u si\u00eau m\u1ecfng c\u00f3 b\u0103ng th\u00f4ng r\u1ed9ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng trong d\u1ea3i t\u1ea7n s\u1ed1 UHF s\u1ebd c\u00f3 \u00edch tr\u00ean ph\u1ea1m vi r\u1ed9ng. Nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 tr\u00ean s\u1ed1 m\u1edbi nh\u1ea5t c\u1ee7a T\u1ea1p ch\u00ed Applied Physics.<\/p>\n

N.P.D (Theo news.discovery.com)<\/em><\/p>\n

N.P.D (Theo news.discovery.com)<\/em>
\n http:\/\/www.vista.gov.vn<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

M\u1ed9t nh\u00f3m c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7 Huazhong, Trung Qu\u1ed1c \u0111\u00e3 c\u00f4ng b\u1ed1 chi ti\u1ebft v\u1ec1 v\u1eadt li\u1ec7u bi\u1ebfn h\u00ecnh gi\u1ed1ng nh\u01b0 t\u1eafc k\u00e8 hoa, c\u00f3 ph\u1ea3n \u1ee9ng t\u1ef1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 h\u1ea5p th\u1ee5 c\u00e1c t\u00edn hi\u1ec7u radar v\u1edbi t\u1ea7n s\u1ed1 kh\u00e1c nhau. V\u1eadt li\u1ec7u AFSS – […]<\/p>\n","protected":false},"author":17,"featured_media":5099,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-4637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=4637"}],"version-history":[{"count":3,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4637\/revisions"}],"predecessor-version":[{"id":5100,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4637\/revisions\/5100"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/5099"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=4637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=4637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=4637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}