- WAAS — Wide Area Augmentation System
- The US satellite-based augmentation system that improves GPS accuracy and integrity for aviation approaches.
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- WAF — Web Application Firewall
- Filter that inspects and blocks malicious HTTP traffic to protect web applications.
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- Walker — Walker Constellation Notation
- i:T/P/F — inclination : total sats / planes / phasing factor. Standard notation for symmetric constellations.
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- Walker Constellation
- A symmetrical satellite constellation pattern defined by three parameters (T/P/F): total satellites, number of planes, and relative phasing between planes. Optimizes uniform coverage.
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- 3D modelTry it: Smad Orbit Visualizer
- WAMI — Wide-Area Motion Imagery
- Persistent imagery covering a large area at frame rates that allow tracking many moving objects at once.
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- WAN — Wide Area Network
- A network spanning large geographic areas, interconnecting multiple local networks.
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- WARNO — Warning Order
- A preliminary notice of an order or action to follow, giving subordinates time to prepare.
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- Waveform
- The shape and characteristics of a radar or communication signal in time and frequency domains. Determines range resolution, velocity resolution, and LPI properties of the transmission.
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- 2D animationTry it: Tdl GuideTry it: Defense Spectrum MapTry it: Ew Guide+1 more
- WBS — Work Breakdown Structure
- A hierarchical decomposition of a project into manageable work packages. Defines all deliverables and provides the framework for cost estimation and schedule planning.
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- DiagramTry it: Mbse Ontology SimulatorTry it: Asd Supply ChainTry it: Space Standards Guide
- WCDMA — Wideband Code Division Multiple Access
- The wideband CDMA air interface underpinning UMTS 3G networks.
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- WDM — Wavelength Division Multiplexing
- Multiplexing optical signals onto one fiber by using different laser wavelengths for each channel.
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- Weather Satellite
- Spacecraft providing meteorological data from GEO (continuous hemispheric imaging) or polar orbit (global coverage). Instruments measure visible, IR, and microwave radiation.
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- 3D modelTry it: Space Mission EvolutionTry it: Defense Missions GuideTry it: Aerospace Defense Industry Guide+1 more
- WEZ — Weapon Engagement Zone
- Airspace volume within which a weapon system can engage a target.
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- WGS — Wideband Global SATCOM
- US military wideband communication satellites in GEO providing high-capacity X-band and Ka-band connectivity for theatre operations.
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- 3D modelTry it: Defense Spectrum MapTry it: Multi Domain Spectrum PlannerTry it: Space Fundamentals Guide+1 more
- WGS-84 — World Geodetic System 1984
- The standard geodetic reference ellipsoid used by GPS and most modern mapping systems. Defines Earth's shape (semi-major axis 6,378,137 m, flattening 1/298.257).
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- 3D modelTry it: Defense Coordinate SystemsTry it: Multiint Fusion Guide
- WGS84 — World Geodetic System 1984
- The standard Earth reference ellipsoid and datum used by GPS and most geodetic computations.
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- White Cell
- The control group in a wargame responsible for managing game execution: enforcing rules, adjudicating outcomes, injecting events, maintaining the timeline, and ensuring analytical objectives are met without biasing player decisions.
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- 2D animationTry it: Wargaming Methodology Guide
- Wi-Fi — Wireless Fidelity
- The IEEE 802.11 family of wireless local area networking technologies.
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- WIA — Wounded in Action
- A casualty status for personnel injured by enemy action who require medical treatment.
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- WiMAX — Worldwide Interoperability for Microwave Access
- An IEEE 802.16 broadband wireless standard for fixed and mobile metropolitan access.
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- Wiper Malware
- Destructive malware designed to irreversibly destroy data rather than steal or ransom it. Notable examples: Shamoon (2012, Saudi Aramco), NotPetya (2017), HermeticWiper (2022). Often masquerades as ransomware to complicate attribution.
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- DiagramTry it: Cyber Warfare GuideTry it: Homeland Security Fundamentals
- WMD — Weapons of Mass Destruction
- Weapons intended to cause indiscriminate mass casualties — chemical, biological, radiological, or nuclear. Governed by multiple international treaties (CWC, BTWC, NPT) and domestic counter-proliferation programmes.
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- DiagramTry it: Multiint Fusion GuideTry it: Defense Fundamentals GuideTry it: Modern Warfare Guide+1 more
- WMS — Warehouse Management System
- Software that controls and optimizes warehouse operations such as receiving, storage, and picking.
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- Workforce
- The collective human capital available to an organisation or sector — its size, skill mix, demographics, and pipeline. Workforce planning aligns capability supply with future demand; workforce development closes identified gaps.
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- DiagramTry it: Aerospace Defense Industry GuideTry it: Space Training ConveyorTry it: Military Doctrine Guide+1 more
- WRM — War Reserve Materiel
- Pre-positioned stocks of equipment and supplies held to sustain forces until resupply is established.
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- WSJF — Weighted Shortest Job First
- A prioritisation heuristic used in Scaled Agile Framework (SAFe): rank work items by (cost of delay) / (job duration). Delivers the most value per unit time when resources are scarce.
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- DiagramTry it: Project Execution Guide
- WTA — Weapon-Target Assignment
- The optimisation problem of allocating available weapons to threats to maximise engagement effectiveness while minimising ordnance expenditure.
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- DiagramTry it: Air Ground Wta
- WVR — Within Visual Range
- Air combat inside ~10 km where opponents can visually acquire each other. WVR missiles are short-range IR-guided (AIM-9X, IRIS-T). High-off-boresight seekers are critical enablers.
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- 3D modelTry it: Defense Fundamentals GuideTry it: Communication Briefing SimTry it: Defense Missions Guide+1 more
- WXR — Weather Radar
- An onboard radar that detects precipitation and storm activity ahead of the aircraft for weather avoidance.
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