{"id":853,"date":"2004-12-02T07:58:00","date_gmt":"2004-12-02T06:58:00","guid":{"rendered":"https:\/\/kids.esa.int\/olympus_and_artemis\/"},"modified":"2026-10-08T00:33:00","modified_gmt":"2026-10-07T22:33:00","slug":"olympus_and_artemis","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/olympus_and_artemis\/","title":{"rendered":"Olympus ja Artemis"},"content":{"rendered":"
\n

ESA on kehitt\u00e4nyt satelliittiviestint\u00e4\u00e4 1970-luvulta l\u00e4htien. Jo vuonna 1980 sen Orbital Test Satellite -satelliittia k\u00e4ytettiin videoyhteyksien luomiseen Saksassa ja Isossa-Britanniassa sijaitsevien ryhmien v\u00e4lill\u00e4. Se v\u00e4litti my\u00f6s h\u00e4t\u00e4puheluita, kun tulipalo tuhosi maaj\u00e4rjestelm\u00e4n Lyonissa.<\/p>\n<\/div>\n

Pian t\u00e4m\u00e4n j\u00e4lkeen Marecs-niminen satelliitti toi mukanaan l\u00e4pimurron matkaviestinn\u00e4ss\u00e4. Ep\u00e4luotettavan lyhytaaltoradion sijaan ihmiset pystyiv\u00e4t k\u00e4ytt\u00e4m\u00e4\u00e4n satelliittipuhelimia soittaakseen alukselta maihin.<\/p>\n

1980-luvun lopulla ja 1990-luvulla laukaistiin nelj\u00e4 ECS-satelliittia. Kukin niist\u00e4 pystyi v\u00e4litt\u00e4m\u00e4\u00e4n 12 000 puhelinyhteytt\u00e4 ja 10 televisiokanavaa ymp\u00e4ri Eurooppaa.<\/p>\n

Satelliitista kattoantenneihin suuntautuvan suoran l\u00e4hetystoiminnan kehitys sai uuden k\u00e4\u00e4nteen vuonna 1989, kun ESA:n Olympus-satelliitti otettiin k\u00e4ytt\u00f6\u00f6n. Olympusta k\u00e4ytettiin my\u00f6s ensimm\u00e4isess\u00e4 tiedonsiirrossa kahden satelliitin v\u00e4lill\u00e4.<\/p>\n

\"Artemis\"
Artemis<\/figcaption><\/figure>\n

Viimeisimm\u00e4t l\u00e4pimurrot ovat per\u00e4isin Artemis-nimisest\u00e4 satelliitista. 30. marraskuuta 2001 sit\u00e4 k\u00e4ytettiin ensimm\u00e4ist\u00e4 kertaa kuvien l\u00e4hett\u00e4miseen laser s\u00e4teen avulla. T\u00e4ydelliset kuvat l\u00e4hetettiin SPOT 4 -satelliitista, joka kiert\u00e4\u00e4 832 km:n korkeudella, Artemis-satelliitille, joka sijaitsee 31 000 km:n korkeudella maanpinnasta.<\/p>\n

T\u00e4ll\u00e4 hetkell\u00e4 Artemis-satelliittia k\u00e4ytet\u00e4\u00e4n kuvien ja valtavien tietom\u00e4\u00e4rien l\u00e4hett\u00e4miseen Envisat-satelliitista ESA:n keskukseen Rooman l\u00e4hell\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"

ESA has been working on satellite communications since the 1970s. As early as 1980, its Orbital Test Satellite was being used for video links between groups in Germany and the […]<\/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\/2000\/09\/artist_s_impression_of_olympus_in_orbit2\/17865897-3-eng-GB\/Artist_s_impression_of_Olympus_in_orbit.gif","esa_banner_description":"Artist's impression of Olympus in orbit","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2000\/09\/Artist_s_impression_of_Olympus_in_orbit2","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-853","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\/fi\/wp-json\/wp\/v2\/posts\/853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=853"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/853\/revisions"}],"predecessor-version":[{"id":4708,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/853\/revisions\/4708"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=853"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=853"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=853"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=853"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=853"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=853"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=853"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}