JACKSTRAWING - A term describing poor chaff dispersal due to tangling of stiff dipoles where no physical adhesion is involved. [10:68] Contrast with BIRDNESTING.
JAFF - [Derived from "JAmming and CHaff"] An ECM tactic involving the use of jammers to illuminate chaff corridors or chaff bursts to produce false targets. [8] Synonymous with NOISE ILLUMINATED CHAFF.
JAMMING - See ELECTRONIC JAMMING.
JAM RESISTANT - A descriptive term which indicates that a device is relatively unaffected by jamming. []
JAM-TO-SIGNAL RATIO (JSR) - The ratio of jamming power to received signal power at which the target illuminated by a radar is exactly at the threshold of detection. This occurs at the BURN-THROUGH RANGE. []
JAVA - A computer language, developed by Sun Microsystems Inc., for writing small programs that can be downloaded and executed. [10:2619] See also ACTIVEX, JAVASCRIPT.
JAVASCRIPT - A computer language, more modest than JAVA, used principally within Web pages to manipulate browser windows and the items within a browser. [] See also ACTIVEX, JAVA.
JET ENGINE MODULATION (JEM) - RF sidebands surrounding the SKIN PAINT. Jet engine modulation amplitude and frequency depend on engine type and jet engine speed, and may be exploited through SPECTRA RECOGNITION techniques. [10:2446] For additional discussion, click (NAWC, Pt. Mugu).
JITTERED PRF ECCM - An ECCM technique where the radar PULSE REPETITION FREQUENCY (PRF) is changed between two or more PRFs. [8]
JITTERED PRF JAMMING - A jamming technique where the ECM equipment jitters the pulse frequency of the signal returned to the victim radar. []
JITTERED PULSE WIDTH ECCM - An ECCM technique where the radar jitters its PULSE WIDTH. [8]
JITTERED PULSE WIDTH JAMMING - An ECM technique that involves the reradiation of a victim radar's signal after randomly varying its PULSE WIDTH. []
JOAN-ELEANOR (J/E) - A World War II directional two-way High Frequency (HF) communications device that enabled an agent on the ground to talk directly with an appropriately-equipped OSS (Office of Strategic Services) agent flying above. [10:2765] NOTE: The J-E's HF band and vertical cone-shaped directivity made direction finding (DF-ing) by the enemy next to impossible.
JOGGER - A military space mission to detect missiles by employing OVER-THE-HORIZON RADAR as well as other sensor systems and classified technologies. [10:2509] See also FAST WALKER, SLOW WALKER.
JOINT HELMET-MOUNTED CUEING SYSTEM (JHMCS) - A CUEING (or CUING) system which projects a display onto a pilot's visor, allowing the pilot to aim the aircraft's radar, missiles, INFRARED sensors and air-to-ground weapons merely by looking at the target and pressing the applicable controls. [10:2820]
JOINT LAND-ATTACK CRUISE MISSILE DEFENSE ELEVATED NETTED SENSOR (JLENS) - A Joint program designed to provide over-the-horizon, wide-area surveillance and precision tracking data to support an over-arching mission area of joint land-attack cruise missile defense and enhanced theater air defense based on the air-directed (e.g., AEROSTAT) surface-to-air missile (ADSAM) engagement concept. [10:2837] See also OVER-THE-HORIZON TARGETING.
JOINT MOBILE OFFSHORE BASE (JMOB) - A man-made, movable, multipurpose, sea-based logistics facility. The JMOB is ideally suited to the maintenance of continuous overseas presence; and theater access complementary to, or independent of, allied or coalition support and infrastructure. The JMOB will provide C4I to a Joint Task Force, house depot-maintenance and other support facilities required by tactical aviation, facilitate special operations forces (SOF) missions, and serve as a logistics base for U.S. and allied air and sea transports, (including the C-17). [10:2662]
JOINT SERVICE CHEMICAL MINIATURE AGENT DETECTOR (JSCMAD) - A small device worn by individual personnel to warn them of a chemical agent attack. Variants include devices to quantify and warn of the presence of nerve agents and blister agents in vapor form in aircraft and shipboard compartments. []
JOINT-SERVICE INTERIOR INTRUSION DETECTION SYSTEM (J-SIIDS) - A detection device, designed for the protection of weapons storage sites, that features sensors which can detect penetration of rooms, movement of intruders and the touching or removal of protected items. [10:2746]
JOINT SERVICES WORKSTATION (JSWS) - A REAL TIME multi-sensor C4I system. []
JOINT SURVEILLANCE SYSTEM (JSS) - An overlapping system of radar units positioned across the perimeter of the continental United States. The JSS is co-owned by the U.S. Air Force (USAF) and the Federal Aviation Administration (FAA). [10:2839]
KALMAN FILTER - A device which uses sensor measurements to determine the position and velocity of a moving or stationary object. The filter can utilize angle-only measurements (e.g., form an optical sensor) or angle-plus-range measurements (e.g., from a radar). It can also simultaneously utilize measurements from more than one sensor (e.g., stereoscopic tracking). [10:2545]
KERR EFFECT - A change in the refractive index of a material under the influence of an electric field. [] See also ELECTRO-OPTICS.
KILL ASSESSMENT - See BATTLE DAMAGE ASSESSMENT.
KILL CHAIN - See THREAT KILL CHAIN.
KINEMATIC FLARE - See FLY-ALONG FLARE.
KINEMATIC SPECIAL MATERIAL DECOY (KSMD) - A rocket-propelled DECOY that dispenses special material INFRARED payloads for tactical aircraft self-protection against threats that employ motion as well as special discriminants in their SEEKERS. [] See also SPECIAL-MATERIAL DECOY.
KINETIC ENERGY ANTISATELLITE (KE-ASAT) - An antisatellite missile designed to reduce orbital debris by flying close by the target satellite and swatting it with a large paddle-like extension of the weapon. [10:2608]
KINETIC ENERGY PENETRATOR - An armament consisting of a combustible cartridge case and a base case with a long-rod tungsten or depleted-uranium penetrator equipped with stabilizing fins and contained within a metal sabot. [10:2719] NOTE: Due to its high muzzle velocity and mass, the kinetic-energy penetrator has a significant armor-penetrating ability.
KINETIC ENERGY WEAPON (KEW) - A term used in connection with ballistic missile defense to mean projectile-type weapons such as hypervelocity rail guns, and chemically propelled space-based interceptors. [10:13] Contrast with DIRECTED ENERGY WEAPON. NOTE: The Soviets have experimented with kinetic energy weapons using streams of high-speed particles of heavy metals (tungsten or molybdenum). [10:18]
KINETIC KILL VEHICLE (KKV) - A Strategic Defense Initiative (SDI) kinetic energy weapon intended to be carried and launched from low Earth orbit carrier satellites against enemy intercontinental ballistic missiles (ICBMs). [10:35] NOTE: The KKV may be launched and propelled with self-contained booster rockets, or by an electromagnetic rail gun. It carries its own communications and terminal guidance system, and will reach a terminal velocity of about 30,000 mph. The destructive force of the KKV is due to the kinetic energy of its 10-15 pound mass rather than explosives.
KLYSTRON - A velocity-modulated (vacuum) tube comprising, in principle, an input resonator, a DRIFT SPACE, and an output resonator. [3]
KNOWLEDGE BASED SYSTEM - See EXPERT SYSTEM.
KNOWLEDGE DISCOVERY IN DATABASES - See DATA MINING.
KNOWLEDGE EXTRACTION - See DATA MINING.
KYTOON - A combination kite and balloon. []
September 28, 2000 05:36 AM -0700