{"id":852,"date":"2004-12-03T10:51:00","date_gmt":"2004-12-03T09:51:00","guid":{"rendered":"https:\/\/kids.esa.int\/satellite_navigation\/"},"modified":"2026-10-08T00:33:00","modified_gmt":"2026-10-07T22:33:00","slug":"satellite_navigation","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/satellite_navigation\/","title":{"rendered":"Satelliittinavigointi"},"content":{"rendered":"
\n

Kauan sitten merell\u00e4 purjehtineet ihmiset l\u00f6ysiv\u00e4t tiens\u00e4 tarkkailemalla auringon, kuun ja t\u00e4htien sijainteja. Sitten, noin vuonna 1300, kompassin keksiminen helpotti hieman n\u00e4iden merenkulkijoiden el\u00e4m\u00e4\u00e4.<\/p>\n<\/div>\n

Nyky\u00e4\u00e4n avaruusteknologian ansiosta kenenk\u00e4\u00e4n ei en\u00e4\u00e4 ole mahdollista eksy\u00e4. Jokainen henkil\u00f6, auto, alus tai lentokone, joka on varustettu satelliittinavigointij\u00e4rjestelm\u00e4ll\u00e4, voi m\u00e4\u00e4ritt\u00e4\u00e4 sijaintinsa 15\u201320 metrin tarkkuudella.<\/p>\n

Satelliittinavigointi perustuu siihen, ett\u00e4 vastaanotin laskee sijaintinsa v\u00e4hint\u00e4\u00e4n nelj\u00e4n satelliitin l\u00e4hett\u00e4mien signaalien avulla.<\/p>\n

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

J\u00e4rjestelm\u00e4, jota nyky\u00e4\u00e4n k\u00e4yt\u00e4mme arjessa, kehitettiin alun perin sotilaallisiin tarkoituksiin. Vuosina 1960\u20131968 Yhdysvaltain armeija laukaisi 23 navigointisatelliittia helpottamaan Polaris-sukellusveneiden navigointia.<\/p>\n

N\u00e4ist\u00e4 kehittyi lopulta maailmanlaajuinen paikannusj\u00e4rjestelm\u00e4 (GPS). Ven\u00e4j\u00e4n puolustusvoimat otti k\u00e4ytt\u00f6\u00f6n vastaavan j\u00e4rjestelm\u00e4n, nimelt\u00e4\u00e4n Glonass. Molemmat j\u00e4rjestelm\u00e4t ovat nyky\u00e4\u00e4n k\u00e4ytett\u00e4viss\u00e4 sek\u00e4 siviili- ett\u00e4 sotilask\u00e4ytt\u00f6\u00f6n. T\u00e4st\u00e4 syyst\u00e4 Eurooppa halusi oman, luotettavan j\u00e4rjestelm\u00e4ns\u00e4.<\/p>\n

Euroopassa on nyt otettu k\u00e4ytt\u00f6\u00f6n EGNOS-niminen j\u00e4rjestelm\u00e4, joka parantaa GPS-j\u00e4rjestelm\u00e4n tarkkuutta. ESA ja Euroopan yhteis\u00f6 kehitt\u00e4v\u00e4t my\u00f6s yhdess\u00e4 Euroopan omaa siviilik\u00e4ytt\u00f6\u00f6n (ei-sotilaalliseen k\u00e4ytt\u00f6\u00f6n) tarkoitettua navigointij\u00e4rjestelm\u00e4\u00e4. Galileo-niminen j\u00e4rjestelm\u00e4 tulee olemaan ensimm\u00e4inen t\u00e4ysin siviilik\u00e4ytt\u00f6\u00f6n tarkoitettu maailmanlaajuinen navigointij\u00e4rjestelm\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"

Long ago, people who sailed the sea found their way by studying the positions of the Sun, Moon and stars. Then, around 1300, the introduction of the compass made life […]<\/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\/2001\/01\/galileo2\/17866193-3-eng-GB\/Galileo.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\/2001\/01\/Galileo2","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-852","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\/852","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=852"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/852\/revisions"}],"predecessor-version":[{"id":4707,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/852\/revisions\/4707"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=852"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=852"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=852"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=852"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=852"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=852"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=852"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}