{"id":3790,"date":"2009-10-02T03:00:25","date_gmt":"2009-10-02T08:00:25","guid":{"rendered":"http:\/\/blogs.scienceforums.net\/swansont\/?p=3790"},"modified":"2009-10-02T03:00:25","modified_gmt":"2009-10-02T08:00:25","slug":"in-the-us-we-pronounce-it-waas","status":"publish","type":"post","link":"http:\/\/blogs.scienceforums.net\/swansont\/archives\/3790","title":{"rendered":"In the US, We Pronounce it &#039;WAAS&#039;"},"content":{"rendered":"<p><a href=\"http:\/\/www.esa.int\/esaCP\/SEM2HGF280G_Benefits_0.html\">EGNOS \u2018Open Service\u2019 available<\/a><\/p>\n<p>EGNOS is the European Geostationary Navigation Overlay Service, which looks to be the European equivalent of WAAS, the Wide-Area Augmentation Service.  Ground stations and geostationary satellites give corrections to GPS satellite position, timing and atmospheric time delay, which improves the positioning \u2026 if your receiver is compatible.<\/p>\n<p>Satellite positioning and timing errors correspond pretty directly to positioning errors, so constant updating reduces errors.  The atmospheric delay is a variable; if you have two frequencies you can figure out the ionosphere delay (it&#8217;s dispersive, so having two frequencies give two delays) but commercial GPS units only currently use 1 frequency; this will change with GPS III.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>EGNOS \u2018Open Service\u2019 available EGNOS is the European Geostationary Navigation Overlay Service, which looks to be the European equivalent of WAAS, the Wide-Area Augmentation Service. Ground stations and geostationary satellites give corrections to GPS satellite position, timing and atmospheric time &hellip; <a href=\"http:\/\/blogs.scienceforums.net\/swansont\/archives\/3790\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[],"class_list":["post-3790","post","type-post","status-publish","format-standard","hentry","category-tech"],"_links":{"self":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/3790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/comments?post=3790"}],"version-history":[{"count":0,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/3790\/revisions"}],"wp:attachment":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/media?parent=3790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/categories?post=3790"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/tags?post=3790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}