passive communications satellite

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• Communications satellite — A communications satellite (sometimes abbreviated to COMSAT) is an artificial satellite stationed in space for the purpose of telecommunications. Modern communications satellites use a variety of orbits including geostationary orbits, Molniya… …   Wikipedia

• communications satellite —    An orbiting vehicle that relays signals between communications stations. There are two types: active, which receives, regenerates, and retransmits signals between stations; and passive, which reflects communications signals between stations …   IT glossary of terms, acronyms and abbreviations

• passive — passively, adv. /pas iv/, adj. 1. not reacting visibly to something that might be expected to produce manifestations of an emotion or feeling. 2. not participating readily or actively; inactive: a passive member of a committee. 3. not involving… …   Universalium

• passive satellite — passive satellite, a communications satellite that reflects a signal but does not receive it and transmit it again …   Useful english dictionary

• satellite communication — Introduction  in telecommunication, the use of artificial satellites to provide communications links between various points on Earth (Earth satellite). Communications satellites relay voice, video, and data signals between widely separated fixed… …   Universalium

• passive — /ˈpæsɪv / (say pasiv), / səv/ (say suhv) adjective 1. not acting, or not attended with or manifested in open or positive action: passive resistance. 2. inactive, quiescent, or inert. 3. suffering action, acted upon, or being the object of action …  

• Echo satellite — The Echo satellites were NASA s first passive communications satellite experiment. Each spacecraft was designed as a metallized balloon satellite acting as a passive reflector of microwave signals. Communication signals were bounced off of it… …   Wikipedia

• Passive radar — systems (also referred to as passive coherent location and passive covert radar) encompass a class of radar systems that detect and track objects by processing reflections from non cooperative sources of illumination in the environment, such as… …   Wikipedia

• EME (communications) — Earth Moon Earth, also known as moon bounce, is a radio communications technique which relies on the propagation of radio waves from an earth based transmitter directed via reflection from the surface of the moon back to an earth based receiver.… …   Wikipedia

• Communications in India — This article is about communications in India. For a more general coverage of media in India, see Media of India. The Republic of India possesses a diversified communications system that links all parts of the country by Internet, telephone,… …   Wikipedia

• Balloon satellite — This article should be restructured. See for more details. A balloon satellite ( satelloon ) is a satellite that is inflated with gas after it has been put into orbit.List of Balloon Satellitesabbreviations:* pcr = passive communications… …   Wikipedia