Technology terms starting with R

1,106 terms

R 2 (1) Recovery and Reconstitution. (2) Reporting Responsibility.
R 2 P 2 Rapid-Retargeting/Precision Pointing (simulator).
R 3 Rotary Reciprocating Refrigerator.
R i Inherent Reliability.
R interface For a basic rate access in an ISDN environment, the interfacing specifications covering pre-ISDN standards (e.g., EIA-232C).
R m Mission Reliability (ILS term).
R&A Reliability and Availability.
R&D Research and Development.
R-T Real Time.
R/ASR Review as Required.
R/C Abbreviation for radio control, radio service.
R/W Read/Write.
R1 The first-generation offspring of a recombinant (genetically modified) organism. Not standard terminology. See: T0, T1, and T2.
R2 The Symmetrix term indicating the remote data copy that is the secondary copy. It is normally read-only by the nodes at the remote site.
R3 Rotary Reciprocating Refrigerator.
RA (Registrant Authority) A Registrant Authority works in conjunction with the Certificate Authority (CA) approving or rejecting requests for certificates of public keys.
RAA Risk Approval Authority.
RAAF Royal Australian Air Force.
RACE A distinguishable group of organisms of a particular species. Criteria for distinctness can be one or a combination of geographic, ecological…
race condition See race hazard.
race hazard A situation that arises between multiple threads sharing a resource. A race hazard arises when one thread's assumptions about the state of a resource are…
raceway Within a building, an enclosure, i.e., channel, used to contain and protect wires, cables, or bus bars.
rack A frame upon which one or more units of equipment are mounted. Note: DOD racks are always vertical.
racon See radar beacon.
RAD Radiation Absorbed Dose. The basic unit of an absorbed dose of ionizing radiation.
Rad Hard Radiation Hardened.
radar Acronym for RAdio Detection And Ranging; a radio device or system for locating an object by means of ultrahigh-frequency radio waves reflected from the…
Radar Beacon A receiver-transmitter combination which sends out a coded signal when triggered by the proper type of pulse, enabling determination of range and bearing…
radar beacon (racon) A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can…
radar blind range The range that corresponds to the situation in which a radar transmitter is on and hence the receiver must be off, so that the radar transmitted signal…
radar blind speed The magnitude of the radial component of velocity of an object, i.e., a target, relative to a radar site, that cannot be measured by the radar unit.
Radar Cross Section The area of a fictitious, perfect reflector of electromagnetic waves (e.g., metal sphere) that would reflect the same amount of energy back to the radar…
Radar Cross Section (RCS) Area of an object as scanned by radar; measured in square meters.
radar intelligence (RADINT) Intelligence derived from data collected by radar. [JP 1-02]
radar mile The time required for a radar pulse to travel 1 mile (~1.6 km) to an object, i.e., to a target; reflect; and return to the receiver.
Radar Netting The linking of several radars to a single center to provide integrated target information.
radar resolution cell The volume of space that is occupied by a radar pulse and that is determined by the pulse duration and the horizontal and vertical beamwidths of the…
radar signature 1. The detailed waveform of a detected radar echo. Note: Radar signatures may be used to identify or distinguish among objects, i.e.
radar xxline-of-sight (LOS) equation An equation that expresses the radar horizon range (RHR), given by where RHRs is the radar horizon range in statute miles, h is the antenna height in…
RADC (1) Region Air Defense Commander. (2) OBSOLETE. Rome Air Development Center. (Now called Rome Laboratory.)
RADEC Radiation Detection Capability.
RADHAZ (1) Electromagnetic Radiation Hazard. (2) Hazards form electromagnetic radiation.
radian (rad.) A unit of plane angle measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
radiance A measure of the intensity of the radiant energy flux emitted by a body in a given direction.
radiant emittance Radiant power emitted into a full sphere, i.e., 4 sr (steradians), by a unit area of a source, expressed in watts per square meter.
Radiant Energy Energy that transmits away from its source in all directions.
radiant exitance Synonym radiant emittance.
Radiant Exposure The total amount of thermal radiation energy received per unit area of exposed surface; it is usually expressed in calories per square centimeter. 242
radiant flux Deprecated synonym for radiant power.
radiant intensity Radiant power per unit solid angle, usually expressed in watts per steradian.
radiant power The rate of flow of electromagnetic energy, i.e., radiant energy. Note 1: Radiant power is usually expressed in watts, i.e., joules per second.
Radiation (RAY-dee-AY-shun) Energy released in the form of particle or electromagnetic waves.
radiation angle In fiber optics, half the vertex angle of the cone of light emitted at the exit face of an optical fiber.
radiation efficiency At a given frequency, the ratio of the power radiated to the total power supplied to the radiator.
radiation field Synonym far-field region.
Radiation Hardening Protection of a particular system, subsystem, or component from functional damage due to the effects of nuclear (or other) radiation by shielding the…
radiation mode For an optical fiber, an unbound mode. Note: In an optical fiber, a radiation mode is one having fields that are transversely oscillatory everywhere…
radiation pattern The variation of the field intensity of an antenna as an angular function with respect to the axis.
radiation resistance The resistance that, if inserted in place of an antenna, would consume the same amount of power that is radiated by the antenna.
radiation scattering The diversion of radiation (thermal, electromagnetic, or nuclear) from its original path as a result of interaction or collisions with atoms, molecules…
radiation security Measures to defend against TEMPEST attacks [CESG].
radiation-hardened fiber An optical fiber made with core and cladding materials that recover, within a specified period of time, a specified percentage of their intrinsic…
RADIC System Rapidly Deployable Integrated Command and Control System.
RADINT Radar Intelligence.
radio 1. Telecommunication by modulation and radiation of electromagnetic waves. 2. A transmitter, receiver, or transceiver used for communication via…
radio access system controller A controller that supports the wireless mobility management and wireless access call control functions.
radio altimeter Radionavigation equipment, on board an aircraft or spacecraft, used to determine the height of the aircraft or the spacecraft above the Earth's surface or…
radio and wire integration (RWI) The combining of wire circuits with radio facilities. [JP 1-02]
radio baseband See baseband.
radio beam A radiation pattern from a directional antenna, such that the energy of the transmitted electromagnetic wave is confined to a small angle in at least one…
Radio Blackout (RBO) The complete disruption of radio (or radar) signal over large areas caused by the ionization accompanying a high altitude nuclear explosion, especially…
radio buttons A group of selectable components in which only one component may be selected. Selection of one of the group causes the previously selected component to be…
radio channel An assigned band of frequencies sufficient for radio communication. Note 1: The bandwidth of a radio channel depends upon the type of transmission and the…
radio channel privacy An encryption treatment applied to signaling or user data, which treatment is intended to prevent an unauthorized detector of the data from extracting…
radio common carrier (RCC) A telecommunications common carrier that provides radio communications services but is not engaged in the business of providing landline local exchange…
radio control The remote control of an apparatus by signals conveyed by electromagnetic waves.
radio detection The detection of the presence of an object by radiolocation without precise determination of its position. [JP 1-02]
radio detection and ranging See radar.
radio direction-finding [RDF] Radiodetermination using the reception of radio waves for the purpose of determining the direction of a station or object. [NTIA] [RR]
radio direction-finding station A radiodetermination station using radio direction-finding. [NTIA] [RR]
radio equipment As defined in Federal Information Management Regulations, any equipment or interconnected system or subsystem of equipment (both transmission and…
radio facility The bearer/signaling connection between the radio port intermediary and the radio port controller. [T1.Rpt34-1994]
radio fadeout See flutter.
radio field intensity Synonym field strength.
radio fix The locating of a radio transmitter by bearings taken from two or more direction finding stations, the site of the transmitter being at the point of…
radio frequency See RF.
radio frequency assignment See frequency assignment.
radio frequency channel assignment Synonym frequency assignment.
Radio Frequency Identification (RFID) Technology that uses low-powered radio transmitters to read data stored in a transponder (tag).
radio frequency interference (RFI) Synonym electromagnetic interference.
radio horizon The locus of points at which direct rays from an antenna are tangential to the surface of the Earth.
radio horizon range (RHR) The distance at which a direct radio wave can reach a receiving antenna of given height from a transmitting antenna of given height.
radio interface The common boundary between a mobile station and the radio equipment in the network, which is the boundary defined by functional characteristics, physical…
radio net An organization of radio stations that is capable of direct communication on a common frequency. 2.
radio paging The use of a pocket-size radio receiver capable of alerting its wearer that there is a phone call, either from a displayed phone number or to a…
radio personal terminal (RPT) A light-weight, pocket-size portable radio terminal (or "personal terminal") providing the capability for the user to be either stationary or in motion…
radio port A unit that supports transmission of signals over the air interface. [After T1.Rpt34-1994]
radio port controller A controller that provides an interface between one or more subtending radio port intermediaries and a PCS switching center, and supports air interface…
radio range The distance from a transmitter at which the signal strength remains above the minimum usable level for a particular antenna and receiver combination. 2.
radio range station A radionavigation land station in the aeronautical radionavigation service providing radial equisignal zones.