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Space vector modulation
Space vector modulation (SVM) is a pulse-width modulation technique for three-phase inverters, yielding about 15% more output voltage than sinusoidal PWM from the same DC supply.
Space Western
A space western, also called sci-fi western, is a science-fiction subgenre transposing American Western themes onto space frontiers, spanning literature, film, television, and video games.
Space-based data center
A space-based data center, also called an orbital data center, hosts processors and storage on satellites in orbit, powered by solar energy and cooled by radiating heat into space.
Space-Based Infrared System
The Space-Based Infrared System (SBIRS) is a United States Space Force constellation of infrared surveillance satellites that detects missile launches for early warning and missile defense.
Space-based solar power
Space-based solar power, also called space solar power, is a proposed technology in which satellites collect sunlight in orbit and beam it to Earth, working day and night in all weather.
Space-division multiple access
Space-division multiple access (SDMA) is a wireless access technique that serves several users in one frequency band by separating them through their distinct spatial signatures on a base-station antenna array.
Space-division multiplexing
Space-division multiplexing (SDM) is a transmission technique that sends multiple independent data streams through spatially separated paths, such as multicore fibers or MIMO antennas, multiplying capacity without extra spectrum.
Space-frequency block code
A space-frequency block code (SFBC) is a transmit-diversity technique for multicarrier wireless systems that applies an orthogonal block code, usually the Alamouti code, across adjacent OFDM subcarriers.
Space-time adaptive processing
Space-time adaptive processing (STAP) is a radar signal processing method that jointly filters signals in space and time to suppress clutter and detect moving targets from airborne platforms.
Space-time block code
A space-time block code (STBC) is a MIMO wireless transmission scheme that maps symbols across transmit antennas and time slots to provide diversity against fading.
Space-time block coding
Space-time block coding (STBC) is a MIMO transmit-diversity technique that maps data symbols across multiple antennas and time slots, letting receivers recover signals even when some antenna paths fade deeply.
Space-time equalization
Space-time equalization is a receiver signal-processing technique for wireless links that combats intersymbol and co-channel interference by filtering jointly across multiple antennas and over time.
Space-time metasurface
A space-time metasurface is an artificial electromagnetic surface whose unit cells vary in both space and time, enabling frequency conversion, beam steering, and nonreciprocal wave control.
Space-time shift keying
Space-time shift keying (STSK) is a MIMO wireless modulation scheme proposed by Shinya Sugiura, Sheng Chen, and Lajos Hanzo at Southampton in 2010, activating one dispersion matrix per block.
Space-time trellis code
A space-time trellis code is a channel code for MIMO wireless systems that extends trellis-coded modulation across multiple transmit antennas, introduced by Tarokh, Seshadri, and Calderbank in 1998.
Space-time-coding metasurfaces
Space-time-coding metasurfaces (STCMs) are programmable arrays of sub-wavelength scattering units that steer beams and redistribute power among frequency harmonics, extending digital coding metasurfaces to applications like integrated sensing and communication.
Space.com
Space.com is an American online publication covering space exploration, astronomy, and spaceflight, founded in 1999 by Lou Dobbs and owned since 2018 by Future plc.
SpaceBEE
SpaceBEE, short for Basic Electronic Elements, is a series of 0.25U CubeSats built by Swarm Technologies for Internet-of-Things messaging, penalized $900,000 by the FCC after a 2018 unauthorized launch.
SpaceBok
SpaceBok is a quadruped research robot built by ETH Zurich and ZHAW students from 2018 to 2021 to study jumping locomotion for exploring the Moon, Mars, and asteroids.
Spacebus
Spacebus is a family of satellite buses for geostationary telecommunications satellites, developed in France since 1985 and now produced by Thales Alenia Space, from Spacebus 100 to all-electric Spacebus Neo.
SpaceCamp
SpaceCamp is a 1986 American family adventure film directed by Harry Winer. It tells the story of teenagers accidentally launched into orbit, and inspired real Space Camp attendance.
Spacecraft
A spacecraft is a vehicle, or flight system, designed to operate in space for missions from orbiting Earth to landing on another planet, ranging from crewed Apollo vehicles to four-inch CubeSats.
Spacecraft assembly and integration facility
A spacecraft assembly and integration facility is a controlled industrial building where spacecraft are built up from parts, integrated, and tested in cleanrooms and environmental test halls before launch.
Spacecraft bus
A spacecraft bus is the part of a spacecraft that supports its payload with power, thermal control, attitude control, and communications, also called the satellite platform.
Spacecraft by launch vehicle
Spacecraft by launch vehicle is a classification scheme that groups uncrewed spacecraft by rocket family rather than mission or orbit, using families like Soyuz, Atlas, Delta, and Proton.
Spacecraft cemetery
The spacecraft cemetery, also called the South Pacific Ocean Uninhabited Area, is a region around Point Nemo where space agencies deliberately deorbit large spacecraft, including the Mir station in 2001.
Spacecraft decommissioning and disposal
Spacecraft decommissioning and disposal is the end-of-life phase of a space mission, in which a spacecraft is deactivated and moved out of its operating orbit to prevent orbital debris.
Spacecraft design
Spacecraft design is the engineering discipline of creating a vehicle that carries a payload through launch, survives the space environment, and performs its mission by trading mass, power, cost, and reliability across every subsystem.
Spacecraft propulsion
Spacecraft propulsion, also called space propulsion, is the set of technologies a spacecraft uses to change velocity by expelling mass or momentum, with chemical, electric, nuclear, and propellantless families.
Spacecraft reentries, 1958–1969
Spacecraft reentries, 1958–1969 spans the first satellite decays to Apollo lunar returns at about 11 km/s, when reentry became routine and capsules were first recovered.