What Are Weapons?

Weapons are devices, systems, or technologies designed to deliver force, energy, or information effects against targets for offensive or defensive military and security purposes. From the perspective of IEEE and the electrical engineering community, the field focuses particularly on the physical principles and engineering systems that underlie modern weapons, including electromagnetic effects, electronic warfare, precision guidance, and directed energy. The study of weapons intersects signal processing, power electronics, materials science, radar engineering, and control systems, distinguishing it from the purely tactical or policy dimensions of armaments. Weapons are classified along many axes: their physical operating principle (kinetic, electromagnetic, acoustic, chemical), their guidance mode (ballistic, guided, autonomous), and their intended effect (lethal, nonlethal, disruption, denial).

The IEEE engineering community engages with weapons primarily through defense electronics research, standards for electromagnetic compatibility, and analysis of the electromagnetic spectrum as both a resource to exploit and a threat domain to protect. This scope encompasses both offensive weaponry, which aims to disable or destroy targets, and defensive weaponry, which protects assets and countermeasures systems against incoming threats.

Electronic and Electromagnetic Weapons

Electronic warfare (EW) weapons operate by controlling or disrupting the electromagnetic spectrum. They fall into three functional categories: electronic attack, which uses electromagnetic energy to degrade or destroy enemy capability; electronic protection, which defends friendly systems against such attacks; and electronic warfare support, which involves passive collection and analysis of enemy emissions. Radio frequency (RF) weapons and directed-energy systems emit concentrated electromagnetic energy, such as high-power microwave pulses, to disrupt or damage electronics in the target. As documented in the IEEE Spectrum article on electromagnetic warfare, narrowband attacks concentrate energy at a single frequency while wideband attacks spread energy across hundreds of megahertz, and both types exploit the increasing vulnerability of modern infrastructure to low-voltage electrical disruption. Rail guns, which accelerate a conductive projectile along electromagnetic rails at velocities exceeding 2,000 meters per second, represent a kinetic application of electromagnetic energy at scales not achievable with chemical propellants.

Smart Weapons and Precision Guidance

Smart weapons use onboard sensors, processors, and control surfaces to guide themselves toward a target after release, substantially improving accuracy over unguided munitions. Guidance modes include inertial navigation, GPS-aided midcourse navigation, terminal infrared or radar seeker homing, and laser designation. The integration of programmable digital processors into weapon systems, sometimes referred to as computer weapons, allows in-flight retargeting, fuze logic reconfiguration, and autonomous target recognition. The IEEE Xplore publication on EMP weapon technology and EMP shielding methodology discusses how electromagnetic pulses, whether generated deliberately or as a byproduct of nuclear detonation, can defeat the electronics that smart weapons and their targets both rely upon, motivating hardened designs.

Nonlethal Weapons

Nonlethal weapons are intended to incapacitate personnel or disable equipment without causing death or permanent injury. The category includes directed-energy systems such as the Active Denial System, which uses millimeter-wave radiation to induce a pain response in human skin, as well as acoustic devices producing extreme sound pressure levels and dazzling laser systems that temporarily impair vision. Nonlethal capabilities present distinct engineering challenges: the weapon must deliver a calibrated physiological effect within a well-defined range of doses while remaining ineffective or reversible outside that window. The Southwest Research Institute electronic warfare systems overview documents the systems-engineering approach used to integrate nonlethal and lethal options within unified defense electronics architectures.

Applications

Weapons technology has applications in a range of fields, including:

• Defense industry procurement and development of integrated combat systems
• Electronic countermeasures and spectrum management in contested environments
• Border security and law enforcement using nonlethal standoff technologies
• Critical infrastructure protection against electromagnetic attack
• Space-based communications hardening against directed-energy threats