Technology terms starting with R

1,106 terms

radio recognition and identification See identification, friend or foe.
Radio Regulations As used in legal documents, the latest (i.e., as of the document date) ITU Radio Regulations to which the United States is a party.
Radio Regulations Board A permanent organization of the International Telecommunication Union (ITU) that implements frequency assignment policy and maintains the Master…
radio relay The reception and retransmission by a radio station of signals that are received either from another radio station or from a wire, fiber optic, microwave…
radio relay system A point-to-point radio transmission system in which signals are received, conditioned, and retransmitted by one or more intermediate radio stations.
radio telegraphy The transmission of telegraphic codes by means of radio. [JP 1-02]
radio telephony The transmission of speech by means of modulated radio waves. [JP 1-02]
radio teletypewriter (RTTY) A teletypewriter employed in a communication system using radio circuits. Note: Such systems are spoken of as RATT systems.
radio termination (RT) A device or functionality that terminates radio transmissions, performs radio channel management, provides rate adaptation between the radio channel and…
radio watch shift Synonym area broadcast shift.
radio wave An electromagnetic wave of a frequency arbitrarily lower than 3000 GHz. Synonym Hertzian wave.
radio-coverage diagram A diagram that shows the area within which a radio station is broadcasting an effective signal strength in relation to a given standard.
radio-wire integration See radio and wire integration.
Radioactive (or Nuclear) Cloud An all-inclusive term for the volume of hot gases, smoke, dust, and other particulate matter from the nuclear weapon itself and from its environment, that…
Radioactivity The spontaneous decay of disintegration of an unstable atomic nucleus accompanied by the emission of radiation.
radiobeacon station A station in the radionavigation service the emissions of which are intended to enable a mobile station to determine its bearing or direction in relation…
radiocommunication Telecommunication by means of radio waves. [NTIA] [RR] [47CFR]
radiocommunication service A service as defined in this Section [of the Radio Regulations] involving the transmission, emission and/or reception of radio waves for specific…
radiodetermination The determination of the position, velocity and/or other characteristics of an object, or the obtaining of information relating to these parameters, by…
radiodetermination station A station in the radiodetermination service. [NTIA] [RR]
radiodetermination-satellite service A radiocommunication service for the purpose of radiodetermination involving the use of one or more space stations.
radiolocation Radiodetermination used for purposes other than those of radionavigation. [NTIA] [RR] [47CFR]
radiolocation land station A station in the radiolocation service not intended to be used while in motion. [NTIA] [RR] [47CFR]
radiolocation mobile station A station in the radiolocation service intended to be used while in motion or during halts at unspecified points. [NTIA] [RR] 2.
radiolocation service A radiodetermination service for the purpose of radiolocation. [NTIA] [RR]
radiological monitoring Synonym monitoring.
radiometry The science of radiation measurement. See Table of Radiometric Terms. TABLE OF RADIOMETRIC TERMS Term Symbol Quantity Unit radiant energy Q energy joule…
radionavigation Radiolocation intended for the determination of position or direction or for obstruction warning in navigation. [JP 1-02] 2.
radionavigation land station A station in the radionavigation service not intended to be used while in motion. [NTIA] [RR]
radionavigation mobile station A station in the radionavigation service intended to be used while in motion or during halts at unspecified points. [NTIA] [RR]
radionavigation-satellite service A radiodetermination-satellite service used for the purpose of radionavigation. This service may also include feeder links necessary for its operation.
Radiosonde An instrument that is carried aloft by a balloon to send back information on atmospheric temperature, pressure and humidity by means of a small…
radiotelegram A telegram, originating in or intended for a mobile station or a mobile Earth station transmitted on all or part of its route over the radiocommunication…
radiotelemetry Telemetry by means of radio waves. [NTIA] [RR]
radiotelephone call A telephone call, originating in or intended for a mobile station or a mobile Earth station, transmitted on all or part of its route over the…
radiotelephone distress frequency An international distress and calling frequency for mobile radiotelephone stations, survival craft, and emergency position-indicating radio beacons.
radiotelex call A telex call, originating in or intended for a mobile station or a mobile Earth station, transmitted on all or part of its route over the…
RADIUS Horizontal distance from the center of rotation.
RADOT Recording Automatic Digital Optical Tracker.
RAG Red-Amber-Green (MDA/POC assessment term).
RAID A raid is a large-scale attack on an area by a group of players.
RAID (Redundant Array of Independent Disk) Redundant Array of Inexpensive Disks. A technology in which data is stored in distributed fashion across multiple disk drives to achieve redundancy and…
RAID (Redundant Array of Independent Disks) A method of accessing multiple individual disks as if the array were one larger disk, spreading data access out over these multiple disks.
RAID (Redundant Array of Independent or Inexpensive Disks) "Redundant Array of Independent Drives", originally known as Redundant Array of Inexpensive Drives, RAID is an umbrellaterm for data storage schemes that…
RAID (Redundant Arrays of Independent Disks) A way of storing the same data in different places on multiple hard disks. Storing data on multiple disks can improve performance by balancing input and…
RAID 0 (striped disks without parity) Block striping across multiple drives is provided, yielding higher performance than is possible with individual drives.
RAID 1 (mirrored disks without parity) Provides data protection by duplicating all data from a primary drive on a secondary drive. Drives are paired and mirrored.
RAID 10 (mirrored disks in a striped set) Combines RAID 0 striping and RAID 1 mirroring. This level provides redundancy through mirroring.
RAID 5 (striped disks with distributed parity) Data is striped across several physical drives. For data redundancy, drives use parity to store and recover data.
RAID 50 (stripe across distributed parity RAID) Combines multiple RAID 5 sets with RAID 0 (striping).
RAID 6 (striped disks with dual distributed parity) Data is striped across several physical drives and uses dual parity to store and recover data.
RAID disk scrubbing The process by which the system reads each disk in the RAID group and tries to fix media errors by rewriting the data to another disk area.
RAID group A set of data disks and a parity disk that implement RAID 4.
RAID Level Migration A process to change the RAID level of an existing RAID array without taking the server offline. Also known as Morphing.
RAID Levels RAID levels refer to different array architectures that offer various advantages in terms of data availability, cost, and performance.
RAID Management Software Software that makes installation, configuration, and management of RAID arrays easy.
RAIL (Redundant Array of Independent Libraries) for tape libraries what RAID is for DASD. See RAID.
Rail Gun (RG) A weapon using metallic rails and electromagnetic energy to fire hypervelocity projectiles.
Rainbow Series [A] set of publications that interpret Orange Book requirements for trusted systems. [INFOSEC-99]
RAIT (Redundant Array of Independent Tape) for tapes what RAID is for DASD. See RAID.
RAM Random Access Memory - the hardware inside a computer that retains memory on a short-term basis and stores information while the user utilizes the…
RAMA (1) Reliability, Availability, and Maintainability. (2) Random Access Memory. (3) Radar Absorption Material.
Raman amplifier Synonym fiber amplifier.
Raman scattering The generation of many different wavelengths of light from a nominally single-wavelength source (a) by means of lasing action and interaction with…
RAMOS (1) Russian-American Observation Satellite. (2) Reliability, availability, maintainability, operations, and support.
RAMS Resource Management Accounting System.
random access discrete address (RADA) A communications technique in which radio users share one wide frequency band instead of each user's being assigned a narrow band.
Random Access Memory Random access memory, or RAM, is memory whose contents are easily accessible to the processing components of a computer.
random access memory (RAM) A read/write, nonsequential-access memory used for the storage of instructions and data.
random data Data that are (a) unpredictable and have no discernable pattern, or (b) satisfy certain mathematical criteria for statistical randomness.
Random Defense Engagement of RVs uniformly without any reference to type or destination. This implies taking the best shot possible in terms of increasing probability to…
random errors Errors distributed over the signal in time so that they can be considered statistically independent from each other. [T1.226-1992]
random filing filing of entities without regard to a particular order or pattern, used with an indexing system for locating them
random noise Noise consisting of a large number of transient disturbances with a statistically random time distribution.
random number A number selected from a known set of numbers in such a way that each number in the set has the same probability of occurrence. 2.
Random Number Generator (RNG) A process used to generate an unpredictable series of numbers. Each individual value is called random if each of the values in the total population of…
randomizer A device used to invert the sense of pseudorandomly selected bits of a bit stream to avoid long sequences of bits of the same sense.
Range Geographic region in which a given plant or animal normally lives or grows.
range GET A range GET specifies a byte range of data to get for a download. If an object is large, you can break up a download into smaller units by sending…
Range Resolution The ability of the radar to distinguish two targets along the same radial but at different ranges. it is approximately Â½ the pulse length.
Range restrictions The ability to limit a search to a specified range of a numerical metadata field. For example, a search for a digital camera between $250 and $400.
ranging The measurement of the distance to a remote object (target), from a known observation or reference point.
Rank The numerical value of a card (as opposed to its suit). Example: "jack," "seven."
rank coercion The ability to rank a file at the top of search results for a given search query. See also: property weighting
Rank profile A rank profile concept enables full control of the relative weight of each component for a given query (for example, how important an article's title is…
Ranking Ranking is a method of assigning a value to an investment in relation to comparable investments by using a scale.
Ranking models Models used to determine how closely content matches a particular query, and whether it should be included in the search results.
RAP Remote Access Panel. 243
RAPIER Rapid Emergency Relocation Team.
RAPTOR A bird of prey such as a falcon, hawk, or eagle.
RAPTOR/TALON A technology demonstration program to demonstrate critical technologies for an unmanned airborne weapons system providing a boost phase intercept…
RAR Resource Adapter Archive. A JAR archive that contains a resource adapter module.
RARP Reverse Address Resolution Protocol. A way of converting Ethernet addresses to IP addresses.
RARSAT Radar Ocean Reconnaissance Satellite.
RAS (1) Requirements Allocation Sheet. (2) Remote Access Set.
RASA Remote Command Safety System.
raster A cellular data structure composed of rows and columns for storing images. Groups of cells with the same value represent features. See also grid.
raster count The total number of raster scanning lines within a display space. [From Weik '89]
raster density In display systems, the number of scanning lines per unit distance perpendicular to the scanning direction. [From Weik '89]
raster graphics Synonym [loosely] bitmapped graphics.