HII’s New GRIMM system brings a sharp edge to the electronic warfare (EW) fight, spotting and tracking threats the moment they appear.
Covering activity from 10 megahertz to 18 gigahertz, the tool can identify, locate, and follow transmissions without giving away its position.
It delivers continuous monitoring with optional transmit function, supporting force protection as well as intelligence, surveillance, and reconnaissance missions.
Designed to operate across any domain, including fully contested electromagnetic environments, GRIMM gives operators persistent situational awareness and real-time, actionable data.
Weighing under 2 pounds (1 kilogram), the system can ride on high-altitude balloons, unmanned and manned platforms, manpack kits, and static ground nodes.
Its open-standard software framework lets users modify tools and integrate third-party capabilities for specific missions.
“GRIMM empowers advanced operations across diverse environments around the world, including contested electromagnetic spectrum scenarios,” said Grant Hagen, HII Mission Technologies President.
GRIMM in Action
The system supports a wide scope of missions, from tracking hostile signals to executing rapid EW effects.
Counterterrorism and counternarcotic units can also benefit from its geolocation features, helping them identify and monitor threats more effectively.
GRIMM’s capabilities further extend to border security, law enforcement, and radio-frequency cyberspace operations, giving agencies flexible options for complex environments.
HII will showcase the new tool at the Association of Old Crows’ 2025 International Symposium & Convention in National Harbor, Maryland.
“We are excited to introduce this next evolution of our EW technology, a small form factor spectrum dominance solution enabling operations on unmanned systems,” Hagen added.
