Starlink pokryje celou planetu satelitním internetem už letos v září. Pokud mu to dovolí regulátoři

24. 6. 2021

Sdílet

 Autor: U.S. Air Force
Satelitní internet Elona Muska dosáhne globálního pokrytí už v září tohoto roku. Starlink má nyní na nízké oběžné dráze okolo 1800 satelitů a celkem jich má být v provozu 12 tisíc. Už současný počet ale téměř stačí na pokrytí celé planety.

Září ale nebude termínem, kdy si bude moci každý zájemce objednat od Elona satelitní internet. Starlink totiž musí ještě získat povolení od místních regulátorů v zemích, kde hodlá službu nabízet. Společnost Starlink patří SpaceX a vede ji Gwynne Shotwel, která zde pracuje již téměř dvacet let.

Starlink již několik měsíců nabízí připojení v některých lokalitách v rámci programu „Better than nothing Beta“ a prozatím získat deset tisíc zákazníků. Má už ale na půl milionu předobjednávek. Měsíční poplatek činí 99 dolarů a zaplatit je potřeba ještě vstupní poplatek 499 dolarů. V ceně je uživatelský terminál a Wi-Fi router.

Steve Jurvetson with Starlink user terminal Steve Jurvetson ze SpaceX s terminálem pro příjem signálu ze Starlinku

Uživatel se se svým zařízením nepřipojuje přímo na satelit (jako tomu bylo třeba v případě sítě Iridium s obřími anténami u satelitních telefonů), ale pomocí paraboly a terminálu si vytvoří lokální síť Wi-Fi (nebo ethernet).

Služby nabízí nebo bude nabízet kromě Spojených států v těchto zemích: UK, Kanada, Rakousko, Austrálie, Argentina, Brazílie, Francie, Chile, Kolombie, Německo, Řecko, Irsko, Itálie, Mexiko, Nizozemí, Nový Zéland, Filipíny, JAR a Španělsko. Současná rychlost dosahuje až k 200/30 Mb/s , přičemž uživatelé hlásí latenci 20 až 45 ms. S přibývajícím počtem satelitů by se měly tyto parametry zlepšovat.

Satelity na orbit vynáší rakety Falcon 9 po desítkách a vypouští je jako vláčky. Doposud proběhlo 29 startů (Falcon 9 je schopný opakovaně přistávat a opět startovat) a každá raketa nesla většinou 60 satelitů. Jejich cílová orbitální výška je okolo 550 km (původně byla plánovaná dvojnásobná výška) nad zemským povrchem. Pro porovnání – Mezinárodní vesmírná stanice ISS létá ve výšce 400 km, oproti tomu družice GPS a dalších geolokačních systémů zase až ve 20 tisících km.

prace_s_linuxem_tip

Starlink über dem Rathaus in Tübingen „Vláček“ nově vypuštěných satelitů Starlink (nutno přiblížit)

Podle SpaceX přesáhnou náklady na vybudování celé sítě 10 miliard dolarů, ale budoucí zisk by měl výrazně převyšovat. Někteří astronomové si ale již stěžují na světelné znečištění a zhoršené podmínky pro sledování hvězd. Ani konkurence nespí a třeba Amazon plánuje podobný projekt pod názvem Kuiper. Naopak Google svůj internet Loon šířený pomocí stratosférických balónů již vzdal.

Využili byste satelitní internet?

zdroj: Reuters

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This helps the SDK to // select the correct creative if multiple are returned. // adsRequest.linearAdSlotWidth = outstreamWidth; // adsRequest.linearAdSlotHeight = outstreamHeight; adsRequest.nonLinearAdSlotWidth = 0; adsRequest.nonLinearAdSlotHeight = 0; adsLoader.requestAds(adsRequest); } function setupReplayScreen() { replayScreen.addEventListener('click', function () { iinfoOutstreamPosition.remove(); iinfoVastUrlIndex = 0; outstreamInit(); }); } /** * Sets the 'adContainer' div as the IMA ad display container. */ function createAdDisplayContainer() { // We assume the adContainer is the DOM id of the element that will house // the ads. outstreamDocument.getElementById('videoContent').style.display = 'none'; adDisplayContainer = new google.ima.AdDisplayContainer( outstreamDocument.getElementById('adContainer'), videoContent); } function unmuteAdvert() { adVolume = !adVolume; if (adVolume) { adsManager.setVolume(0.3); outstreamDocument.getElementById('adMuteBtn').innerHTML = ''; } else { adsManager.setVolume(0); outstreamDocument.getElementById('adMuteBtn').innerHTML = ''; } } /** * Loads the video content and initializes IMA ad playback. */ function playAds() { // Initialize the container. Must be done through a user action on mobile // devices. videoContent.load(); adDisplayContainer.initialize(); // setupDimensions(); try { // Initialize the ads manager. Ad rules playlist will start at this time. adsManager.init(1920, 1080, google.ima.ViewMode.NORMAL); // Call play to start showing the ad. Single video and overlay ads will // start at this time; the call will be ignored for ad rules. adsManager.start(); // window.addEventListener('resize', function (event) { // if (adsManager) { // setupDimensions(); // adsManager.resize(outstreamWidth, outstreamHeight, google.ima.ViewMode.NORMAL); // } // }); } catch (adError) { // An error may be thrown if there was a problem with the VAST response. // videoContent.play(); } } /** * Handles the ad manager loading and sets ad event listeners. * @param { !google.ima.AdsManagerLoadedEvent } adsManagerLoadedEvent */ function onAdsManagerLoaded(adsManagerLoadedEvent) { // Get the ads manager. const adsRenderingSettings = new google.ima.AdsRenderingSettings(); adsRenderingSettings.restoreCustomPlaybackStateOnAdBreakComplete = true; adsRenderingSettings.loadVideoTimeout = 12000; // videoContent should be set to the content video element. adsManager = adsManagerLoadedEvent.getAdsManager(videoContent, adsRenderingSettings); // Add listeners to the required events. adsManager.addEventListener(google.ima.AdErrorEvent.Type.AD_ERROR, onAdError); adsManager.addEventListener( google.ima.AdEvent.Type.CONTENT_PAUSE_REQUESTED, onContentPauseRequested); adsManager.addEventListener( google.ima.AdEvent.Type.CONTENT_RESUME_REQUESTED, onContentResumeRequested); adsManager.addEventListener( google.ima.AdEvent.Type.ALL_ADS_COMPLETED, onAdEvent); // Listen to any additional events, if necessary. adsManager.addEventListener(google.ima.AdEvent.Type.LOADED, onAdEvent); adsManager.addEventListener(google.ima.AdEvent.Type.STARTED, onAdEvent); adsManager.addEventListener(google.ima.AdEvent.Type.COMPLETE, onAdEvent); playAds(); } /** * Handles actions taken in response to ad events. * @param { !google.ima.AdEvent } adEvent */ function onAdEvent(adEvent) { // Retrieve the ad from the event. 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It is the responsibility of the Publisher to // implement this function when necessary. // setupUIForContent(); } function onActiveView() { if (outstreamContainer) { const containerOffset = outstreamContainer.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight/1 && containerOffset.bottom > 0.0) { if (outstreamPaused) { adsManager.resume(); outstreamPaused = false; } return true; } else { if (!outstreamPaused) { adsManager.pause(); outstreamPaused = true; } } } return false; } let outstreamInitInterval; if (typeof cpexPackage !== "undefined") { outstreamInitInterval = setInterval(tryToInitializeOutstream, 100); } else { const wrapper = getWrapper(); if (wrapper) { let outstreamInitialized = false; window.addEventListener('scroll', () => { if (!outstreamInitialized) { const containerOffset = wrapper.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight / 1 && containerOffset.bottom > 0.0) { outstreamInit(); outstreamInitialized = true; } } }); } } function tryToInitializeOutstream() { const wrapper = getWrapper(); if (wrapper) { const containerOffset = wrapper.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight / 1 && containerOffset.bottom > 0.0) { if (cpexPackage.adserver.displayed) { clearInterval(outstreamInitInterval); outstreamInit(); } } } else { clearInterval(outstreamInitInterval); } } }
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