| 词条 | Medium Earth orbit |
| 释义 |
The orbit is home to a number of artificial satellites – the most common uses include navigation, communication, and geodetic/space environment science.[1] The most common altitude is approximately {{convert|20200|km|mi|0}}), which yields an orbital period of 12 hours, as used, for example, by the Global Positioning System (GPS).[1] Other satellites in medium Earth orbit include Glonass (with an altitude of {{convert|19100|km}}[2]) and Galileo (with an altitude of {{convert|23222|km|mi|0}})[3] constellations. Communications satellites that cover the North and South Pole are also put in MEO.[4] The orbital periods of MEO satellites range from about 2 to nearly 24 hours.[1] Telstar 1, an experimental satellite launched in 1962, orbited in MEO.[5] See also
Notes1. ^1 2 3 {{cite web |title=Definitions of geocentric orbits from the Goddard Space Flight Center |url=http://gcmd.nasa.gov/User/suppguide/platforms/orbit.html |work=User support guide: platforms |publisher=NASA Goddard Space Flight Center |accessdate=2012-07-08 |deadurl=yes |archiveurl=https://web.archive.org/web/20100527132541/http://gcmd.nasa.gov/User/suppguide/platforms/orbit.html |archivedate=May 27, 2010 }} 2. ^{{cite web|url=http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA484380|title=The Global Navigation System GLONASS: Development and Usage in the 21st Century|publisher=34th Annual Precise Time and Time Interval (PTTI) Meeting|year=2002|access-date=28 February 2019}} 3. ^Galileo Satellites 4. ^Satellite Basics: Solution Benefits {{webarchive|url=https://archive.is/20131119183307/http://exnetapps.intelsat.com/resources/satellite-basics/benefits.asp |date=2013-11-19 }} 5. ^Medium Earth Orbit References{{reflist}}{{orbits}} 1 : Earth orbits |
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