Starlink is a satellite internet constellation operated by American aerospace company SpaceX, providing coverage to over 60 countries. It also aims for global mobile phone service after 2023. SpaceX started launching Starlink satellites in 2019. As of August 2023, Starlink consists of over 5,000 mass-produced small satellites in low Earth orbit (LEO), which communicate with designated ground transceivers. In total, nearly 12,000 satellites are planned to be deployed, with a possible later extension to 42,000. SpaceX announced reaching more than 1 million subscribers in December 2022 and 1.5 million subscribers in May 2023.
The SpaceX satellite development facility in Redmond, Washington, houses the Starlink research, development, manufacturing, and orbit control teams. The cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in May 2018 to be at least US10billion(equivalenttoUS billion in ). SpaceX expects more than 30billioninrevenueby2025fromitssatelliteconstellation,whilerevenuesfromitslaunchbusinesswereexpectedtoreach5 billion in the same year.
Astronomers have raised concerns about the effect the constellation can have on ground-based astronomy and how the satellites will add to an already congested orbital environment. SpaceX has attempted to mitigate astronometric interference concerns with measures to reduce their brightness during operation. The satellites are equipped with Hall-effect thrusters allowing them to orbit raise, station-keep, and de-orbit at the end of their life. Additionally, the satellites are designed to autonomously and smoothly avoid collisions based on uplinked tracking data.
Constellations of low Earth orbit satellites were first conceptualized in the mid-1980s as part of the Strategic Defense Initiative, culminating in Brilliant Pebbles, where weapons were to be staged in orbit to intercept ballistic missiles at short notice.
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Bases de la géomatique pour les ingénieur·e·s civil et en environnement. Présentation des méthodes d'acquisition, de gestion et de représentation des géodonnées. Apprentissage pratique avec des méthod
All fundamental principles behind modern satellite positioning to acquire, track and evaluate direct and indirect satellite signals and process them in relation to example applications: Earth monito
Multiprocessors are a core component in all types of computing infrastructure, from phones to datacenters. This course will build on the prerequisites of processor design and concurrency to introduce
The New Space Economy is a fast-growing market, driven by the commercialization of the historical institutional space sector. This course contains more than 30 videos-lectures from space experts from
The New Space Economy is a fast-growing market, driven by the commercialization of the historical institutional space sector. This course contains more than 30 videos-lectures from space experts from
Covers optimal control, focusing on problems 4 and 7.
Emphasizes developing employees through team projects and explores leadership, management, corporate culture, and the 70/20/10 development model.
Covers variational methods in mechanics, focusing on the Ritz-Galerkin method.
Telesat, formerly Telesat Canada, is a Canadian satellite communications company founded on May 2, 1969. The company is headquartered in Ottawa. Telesat began as Telesat Canada, a Canadian Crown corporation created by an Act of Parliament, in 1969. Telesat Canada launched Anik A1 in 1972 as the world's first domestic communications satellite in geostationary orbit operated by a commercial company; this satellite was retired from use in 1981.
The Kessler syndrome (also called the Kessler effect, collisional cascading, or ablation cascade), proposed by NASA scientist Donald J. Kessler in 1978, is a scenario in which the density of objects in low Earth orbit (LEO) due to space pollution is numerous enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions.
ORBCOMM is an American company that offers industrial internet and machine to machine (M2M) communications hardware, software and services designed to track, monitor, and control fixed and mobile assets in markets including transportation, heavy equipment, maritime, oil and gas, utilities and government. The company provides hardware devices, modems, web applications, and data services delivered over multiple satellite and cellular networks. As of June 30, 2021, ORBCOMM has more than 2.
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EPFL2021
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Does gravity affect decision-making? This question comes into sharp focus as plans for interplanetary human space missions solidify. In the framework of Bayesian brain theories, gravity encapsulates a strong prior, anchoring agents to a reference frame via ...