HII’s Mission Technologies division has operationalised a new high-performance spectrum dominance system designed to detect and locate hostile communications, radar signals and other electronic threats. The system, known as GRIMM, is now in use across multiple defence customers and will be demonstrated at the Association of Old Crows’ 2025 International Symposium & Convention in Maryland.
GRIMM draws on HII’s long-running work in electromagnetic warfare systems for national defence. The platform is designed to support rapid electronic threat detection and situational awareness and can be used across a range of missions including military operations, counterterrorism, border security, counternarcotics, ISR and RF-enabled cyber operations. The system has been deployed on unmanned platforms for both passive and active electronic warfare roles.
HII executives said the capability is intended to support operations in increasingly contested electromagnetic environments, where forces require tools that can identify and respond to electronic threats at speed. The company positions the system as part of a broader push to provide multi-domain capabilities spanning land, sea, air, space and cyber.
Mission Technologies develops systems across areas such as AI-enabled analytics, electromagnetic spectrum engineering, and rapid prototyping. The company will highlight GRIMM’s field performance and small-form-factor integration during its exhibition at the Old Crows event.
