| 单词 | LEO (Low Earth Orbit) |
| 释义 | LEO (Low Earth Orbit) A satellite or satellite constellation (i.e., system) operating at an altitude of 644–2,415 kilometers. Although the term is not precisely defined, Little LEOs involve a relatively small number of satellites, and operate at frequencies below 1 GHz in support of low bit-rate data traffic, such as telemetry, vehicle messaging, and personal messaging. Big LEOs are bigger networks that operate at higher frequencies in support of voice and higher-speed data communications. Unlike a geosynchronous Earth orbiting (GEO) satellite, LEO and MEO (Middle Earth Orbit) satellites do not remain in a fixed position relative to the Earth’s surface, so are referred to as mobile satellite systems (MSSs), as opposed to the fixed satellite systems (FSSs) in geostatic orbit. See also FSS, GEO, MEO, MSS, and satellite. |
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