U.S. Army Deploys AN/ARC-231A MARS: Advanced Multi-Mode Radio with Type 1 Encryption

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The AN/ARC-231A Multi-mode Aviation Radio Set (MARS) from BAE Systems has officially completed its initial installation phase and is now operational on select U.S. Army rotary-wing aircraft. This milestone marks a significant advancement in airborne communication technology, as the AN/ARC-231A system introduces a new generation of multi-band, multi-mission capabilities tailored for modern military operations. Designed to replace the legacy ARC-231 radios currently in widespread use across U.S. and allied forces, the AN/ARC-231A offers enhanced performance, security, and adaptability.

Photo: baesystems.com

Operating across a broad frequency range from 30 MHz to 2 GHz, the AN/ARC-231A provides exceptional flexibility for a wide array of mission profiles. This expansive spectrum ensures compatibility with both legacy and emerging communication systems, allowing seamless integration into existing platforms while supporting future upgrades. The system’s frequency range is also expandable, offering scalability for evolving operational requirements and technological advancements.

One of the defining features of the AN/ARC-231A is its support for a comprehensive suite of integrated waveforms, including SINCGARS, HAVE QUICK I/II, SATURN, and MUOS. These waveforms enable secure and reliable communication across different domains, from tactical ground operations to satellite-based command and control. By incorporating these standardized waveforms, the radio ensures interoperability across joint and coalition forces, enhancing coordination and mission effectiveness.

Security remains a cornerstone of the AN/ARC-231A’s design, with embedded NSA-modernized Type 1 cryptographic solutions for both voice and data transmissions. These advanced encryption protocols include HAIPE and TSVCIS, which safeguard sensitive communications against interception and exploitation. The integration of Type 1 cryptography reflects the system’s compliance with the highest standards of military-grade security, making it suitable for classified and mission-critical operations.

The radio supports multiple communication types, including line-of-sight (LOS), satellite communications (SATCOM), air traffic control (ATC), maritime, and land mobile radio (LMR). This versatility allows the AN/ARC-231A to serve as a central communication hub across diverse operational environments, from battlefield coordination to logistical support and airspace management. Its ability to bridge different communication domains enhances situational awareness and operational cohesion.

Channel spacing on the AN/ARC-231A is configurable to meet various regulatory and mission-specific requirements, including 5, 6.25, 8.33, 12.5, and 25 kHz. The inclusion of 8.33 kHz spacing ensures compliance with international ATC standards, facilitating global deployment and interoperability with civilian aviation systems. This adaptability in channel configuration underscores the radio’s readiness for both domestic and international missions.

As a software-defined radio (SDR), the AN/ARC-231A is engineered for long-term viability through software-based upgrades. This architecture allows the system to evolve in response to emerging threats, new waveforms, and changing mission demands without requiring hardware replacement. The SDR foundation ensures that the radio remains relevant and capable throughout its operational lifecycle, reducing costs and logistical burdens.

Interoperability is a key advantage of the AN/ARC-231A, with built-in standards and waveforms that enable joint service operations and coalition integration. Whether deployed in joint task forces or multinational exercises, the radio facilitates seamless communication across different branches and allied forces. This capability strengthens strategic partnerships and enhances the effectiveness of combined operations.

The AN/ARC-231A MARS system comprises the RT-1987 radio and a suite of ancillary components, including high-power transmit amplifiers (HPAs), preamplifiers, mounts, and control units. These components work in concert to deliver robust and reliable communication performance under demanding operational conditions. The modular design also simplifies maintenance and upgrades, contributing to overall system resilience.

Flexibility is a hallmark of the AN/ARC-231A, with its software-defined architecture and multi-mode communication capabilities supporting a wide range of mission scenarios. From tactical deployments to humanitarian assistance and disaster relief, the radio adapts to the unique demands of each operation. Its ability to function across different platforms and environments makes it a valuable asset for modern military forces.

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