{"id":805,"date":"2011-07-05T08:12:00","date_gmt":"2011-07-05T06:12:00","guid":{"rendered":"https:\/\/kids.esa.int\/communications\/"},"modified":"2026-10-08T00:32:27","modified_gmt":"2026-10-07T22:32:27","slug":"communications","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/communications\/","title":{"rendered":"Kommunikation"},"content":{"rendered":"
\n

Fans af tv-serien fra 1960\u2019erne Star Trek<\/i> var forbl\u00f8ffede, da de s\u00e5 kaptajn Kirk klappe en lille h\u00e5ndholdt telefon op for at tale med bes\u00e6tningen p\u00e5 sit rumskib. I dag er mobiltelefoner ikke l\u00e6ngere science fiction. Uanset hvor man befinder sig p\u00e5 Jorden, fra polaromr\u00e5derne til midt p\u00e5 havet, er det muligt at holde kontakten via telefonen. Med de nyeste modeller er det ogs\u00e5 muligt at sende e-mails og s\u00f8ge p\u00e5 internettet.<\/p>\n<\/div>\n

Denne revolution inden for kommunikation er blevet mulig takket v\u00e6re indf\u00f8relsen af satellitteknologi. Indtil midten af 1960\u2019erne blev telefonopkald h\u00e5ndteret via landbaserede radioforbindelser og kabler. Der var dog begr\u00e6nsninger for, hvor mange opkald der kunne h\u00e5ndteres.<\/p>\n

S\u00e5 kom de f\u00f8rste kommunikationssatellitter. Satellitterne, der kredsede i en geostation\u00e6r bane ca. 36.000 km over \u00e6kvator, kunne fungere uden et dyrt netv\u00e6rk af sendere og kabler. De kunne nemt forbinde opkaldere p\u00e5 hver sin side af et hav eller en bjergk\u00e6de. Early Bird, der blev opsendt i 1965, kunne h\u00e5ndtere 240 telefonopkald p\u00e5 samme tid. I dag kan en stor kommunikationssatellit h\u00e5ndtere hundredtusindvis af telefonopkald.<\/p>\n

Der er sket endnu en revolution i de seneste \u00e5r med indf\u00f8relsen af fl\u00e5der af sm\u00e5 satellitter i lave eller mellemh\u00f8je kredsl\u00f8b om Jorden. Da snesevis af dem flyver langs forskellige baner, er der altid flere satellitter over horisonten, der kan modtage opkald fra mobile enheder. Hvert opkald sendes derefter til en \u2018gateway\u2019-station p\u00e5 jorden, som videresender det til modtageren. Disse satellitter bruges ogs\u00e5 til personlig sporing, beskedtjenester og lokalisering i n\u00f8dsituationer.<\/p>","protected":false},"excerpt":{"rendered":"

Fans of the 1960s TV series Star Trek were amazed when they saw Captain Kirk flip open a tiny hand-help phone to speak to the crew of his starship. Today, […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2010\/10\/hylas-1_serving_europe2\/17876924-2-eng-GB\/Hylas-1_serving_Europe.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/10\/Hylas-1_serving_Europe2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,54,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-805","post","type-post","status-publish","format-standard","hentry","category-learn","category-space-technologies-on-earth","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=805"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/805\/revisions"}],"predecessor-version":[{"id":1948,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/805\/revisions\/1948"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=805"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=805"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=805"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=805"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=805"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=805"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=805"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}