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The International Cospas-Sarsat Programme is a satellite -aided search and rescue (SAR) initiative. It is organized as a treaty -based, nonprofit, intergovernmental, humanitarian cooperative of 45 nations and agencies (see infobox). [2] It is dedicated to detecting and locating emergency locator radio beacons activated by persons, aircraft or ...
GNSS reflectometry is passive sensing that takes advantage of and relies on separate active sources - the satellites generating the navigation signals. For this, the GNSS receiver measures the signal delay from the satellite (the pseudorange measurement) and the rate of change of the range between satellite and observer (the Doppler measurement).
Eutelsat OneWeb (legally Network Access Associates Ltd.) is a subsidiary of Eutelsat Group providing broadband satellite Internet services in low Earth orbit (LEO). The company is headquartered in London, and has offices in Virginia, US and a satellite manufacturing facility in Florida – Airbus OneWeb Satellites – that is a joint venture with Airbus Defence and Space.
N2YO provides real time tracking and pass predictions with orbital paths and footprints overlaid on Google Maps. It features an alerting system that automatically notifies users via SMS and/or email before International Space Station crosses the local sky. The N2YO.com system powers ESA's, Space.com's and many other's satellite tracking web pages.
The Iridium satellite constellation was conceived in the early 1990s as a way to reach high Earth latitudes with reliable satellite communication services. [9] Early calculations showed that 77 satellites would be needed, hence the name Iridium, after the metal with atomic number 77.
The Indian Regional Navigation Satellite System ( IRNSS ), with an operational name of NavIC (acronym for Navigation with Indian Constellation; also, nāvik 'sailor' or 'navigator' in Indian languages), [2] is an autonomous regional satellite navigation system that provides accurate real-time positioning and timing services. [3]
The United Kingdom Global Navigation Satellite System ( UK GNSS) was a United Kingdom Space Agency (UKSA) research programme which, between May 2018 and September 2020, developed outline proposals for a United Kingdom (UK) owned and operated conventional satellite navigation system, as a British alternative to the European Union (EU) owned and ...
That is the satellites' clocks are slower than Earth's clocks by 7214 nanoseconds a day due to their velocity. Note that this speed of 3874 m/s is measured relative to Earth's center rather than its surface where the GPS receivers (and users) are. This is because Earth's equipotential makes net time dilation equal across its geodesic surface.