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operational status of the satellite and its equipment.
Heavy Replicas
(HREPS)
Decoys, which by virtue of shape, size, and mass, closely approximate an RV’s
signature. HREPS have significant off- load penalty.
HEDI OBSOLETE. See High Endoatmospheric Defense Interceptor.
HEDR High Endoatmospheric Defense Radar.
HEDS High Endoatmospheric Defense System.
HEI High Endoatmospheric Interceptor.
HEL High Energy Laser.
HELKS High Energy Laser Kill System.
HELLO High Energy Laser Light Opportunity.
HELSTF High Energy Laser Systems Test Facility.
HELWS High Energy Laser Weapon System.
HEMP High Altitude Electromagnetic Pulse.
MDA GLOSSARY, VER. 4.0 H
126
HEMTT Heavy Expanded Mobility Tactical Truck (US Army prime mover).
Hen House Soviet area defense radar used as a component of the Moscow ABM system
that provides VHF coverage of space to monitor orbiting satellites and early
warning of ICBMs launched from the U.S.
HEO See High Earth Orbit.
HERA (1) An improved surrogate TBM test target.
(2) Two-stage, ground launched solid propellant theater target vehicle. (MDA
Lexicon)
HERO Hazards of Electromagnetic Radiation to Ordnance (SM-2 Bk IVA).
HESP High Efficiency Solar Panel.
HEU Highly Enriched Uranium.
HF (1) High Frequency. (2) Hydrogen fluoride.
HF/DF (1) High Frequency/Direction Finding.
(2) Hydrogen Fluoride/Deuterium Fluoride. (Chemicals used in IR chemical
lasers).
HFCNR High Frequency Combat Net Radio.
HFE Human Factors Engineering.
HgCdTe Mercury Cadmium Telluride.
HHB Headquarters and Headquarters Battery.
HIBEX High-Acceleration Boost Experiment.
HIBREL High Brightness Relay.
HIC Human-in-Control.
HICOM High Command (Navy term).
HICTB Human-in-Control Test Bed.
HIDACZ High Density Aerospace Control Zone.
HIDAR High Data Rate.
High Earth Orbit
(HEO)
An orbit about the earth at an altitude greater than 3,000 nautical miles (about
5,600 kilometers).
High
Endoatmosphere
That portion of the earth’s atmosphere, generally above 40 km altitude.
High
Endoatmospheric
Defense
Interceptor (HEDI)
OBSOLETE. Interceptor concept designed to engage RVs within the (upper or
high endo) atmosphere. (Predecessor to Endo-Exoatmospheric Interceptor
(E2I).)
MDA GLOSSARY, VER. 4.0 H
127
High Density
Aerospace
Control Zone
(HIDACZ)
Airspace designated in an airspace control plan or airspace control order, in
which there is a concentrated employment of various weapons and users. A
HIDACZ has defined dimensions, that usually coincide with geographical
features or navigational aides. Access to a HIDACZ is normally controlled by the
maneuver commander. The maneuver commander can also direct a more
restrictive weapons status within the HIDACZ.
Higher Authority
Interface
Policy, strategy, doctrine, readiness conditions, and rules of engagement from
higher authorities for use by the defense system in conducting system
operations including specific orders specifying actions such as testing, defense
enabling, pre-delegation of authority, etc. Also the reporting of situation
assessment and system readiness to higher authority.
High Order
Language (HOL)
A programming language that requires little knowledge of the computer on which
a program will run, can be translated into several different machine languages,
allows symbolic naming of operations and addresses, provides features
designed to facilitate expression of data structures and program logic, and
usually results in several machine instructions for each program statement.
HIL Human In-the-Loop.
HIMAD High to Medium Altitude Air Defense.
HIMEZ High Altitude Missile Engagement Zone.
HIP Hot Isostatic Processing.
HIRAM High Resolution Infrared Auroral Measurements.
HISEM High Speed Environmental Multi-burst Model.
HIT (1) Heterojuncture Internal Photomissive. (2) Homing Interceptor Technology.
HK Hard Kill.
HKV Hit to Kill Vehicle.
HLD Hardware Description Language.
HLLV Heavy Lift Launch Vehicle.
HMC&M Hazardous Material Control and Management.
HMI Human Machine Interface.
HMMWV High Mobility Mutli-purpose Whealed Vehicle (USA term) (pronounced Hum Vee).
HMPC Hazardous Maintenance Procedure Code.
HMSC Hughes Missile System Corporation.
HOB Height of Burst.
HOE OBSOLETE. Homing Overlay Experiment. (Predecessor program to
Exoatmospheric Reentry Vehicle Interceptor Subsystem (ERIS).)
HOL High Order Language.
MDA GLOSSARY, VER. 4.0 H
128
Homing All-the-
Way Killer
　
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