Communications satelliteArtificial satellite that relays radio signals An Iridium satellite for satellite telephony Part of a series onSpaceflight History History of spaceflight Space Race Timeline of spaceflight Space probes Lunar missions Mars missions Applications Communications Earth observation Exploration Espionage Military Navigation Colonization Habitation Exploration Telescopes Tourism Spacecraft Robotic spacecraft Satellite Space probe Cargo spacecraft Crewed spacecraft Apollo Lunar Module Space capsules Space Shuttle Space stations Spaceplanes Vostok Space launch Spaceport Launch pad Expendable and reusable launch vehicles Escape velocity Non-rocket spacelaunch Spaceflight types Sub-orbital Orbital Interplanetary Interstellar Intergalactic List of space organizations Space agencies Space forces Companies Spaceflight portalvte A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
Jane's Military CommunicationsJane's Military Communications is an annual reference book (also published online) covering military communications and advances in the equipment used by various armed forces. Published by Jane's Information Group, a subsidiary of IHS Inc., it purports to be "the most comprehensive military communications information resource available." The former European editor of the Journal of Electronic Defense, John Williamson, was appointed editor in 1984.
Tactical communicationsTactical communications are military communications in which information of any kind, especially orders and military intelligence, are conveyed from one command, person, or place to another upon a battlefield, particularly during the conduct of combat. It includes any kind of delivery of information, whether verbal, written, visual or auditory, and can be sent in a variety of ways. In modern times, this is usually done by electronic means.
CommunicationTransmission of information"Communicate" redirects here. For other uses, see Communicate (other).There are many forms of communication, including human linguistic communication using sounds, sign language, and writing as well as animals exchanging information and attempts to communicate with intelligent extraterrestrial life.Communication is commonly defined as the transmission of information.
Tropospheric scatterTropospheric scatter, also known as troposcatter, is a method of communicating with microwave radio signals over considerable distances – often up to 500 kilometres (310 mi) and further depending on frequency of operation, equipment type, terrain, and climate factors. This method of propagation uses the tropospheric scatter phenomenon, where radio waves at UHF and SHFfrequencies are randomly scattered as they pass through the upper layers of the troposphere.
InformationInformation is an abstract concept that refers to something which has the power to inform. At the most fundamental level, it pertains to the interpretation (perhaps formally) of that which may be sensed, or their abstractions. Any natural process that is not completely random and any observable pattern in any medium can be said to convey some amount of information.
MicrowaveMicrowave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz (wavelengths between 30 cm and 3 mm), or between 1 and 3000 GHz (30 cm and 0.1 mm).
MilitaryOrganized force intended for warfareNATO military ceremony in Pabradė, Lithuania, November 2014A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a distinct military uniform.
Signal processingSignal processing is an electrical engineering subfield that focuses on analyzing, modifying and synthesizing signals, such as sound, images, potential fields, seismic signals, altimetry processing, and scientific measurements. Signal processing techniques are used to optimize transmissions, digital storage efficiency, correcting distorted signals, improve subjective video quality, and to detect or pinpoint components of interest in a measured signal.
SurveillanceMonitoring something for the purposes of influencing, protecting, or suppressing itSurveillance cameras at Tiananmen Square, 2009Surveillance cameras in Gdynia, PolandSurveillance is the systematic observation and monitoring of a person, population, or location, with the purpose of information-gathering, influencing, managing, or directing. It is widely used by governments for a variety of reasons, such as law enforcement, national security, and information awareness.
FacsimileA facsimile (from Latin fac simile, "to make alike") is a copy or reproduction of an old book, manuscript, map, art print, or other item of historical value that is as true to the original source as possible. It differs from other forms of reproduction by attempting to replicate the source quite accurately in scale, color, condition, and other material qualities.Naval flag signallingNaval flag signalling covers various forms of flag signalling, such as semaphore or flaghoist, used by various navies; distinguished from maritime flag signalling by merchant or other non-naval vessels or flags used for identification.
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