Military Embedded Systems

Beyond Line of Sight High Frequency comms demoed by GA-ASI without SATCOM

News

January 11, 2021

Emma Helfrich

Technology Editor

Military Embedded Systems

U.S. Air Force photo.

POWAY, Calif. General Atomics Aeronautical Systems, Inc. (GA-ASI) completed the first Beyond Line of Sight (BLOS) High Frequency (HF) Command and Control (C2) demonstration for an Unmanned Aircraft System (UAS). According to officials, the HF C2 capability does not require a Satellite Communications (SATCOM) link and is capable of providing BLOS connectivity up to 8,000 miles, depending on transmit power and link geometry.

For the demo, GA-ASI integrated the U.S. Government’s Collaborative Operations in Denied Environment (CODE) autonomy software into the Open Operational Flight Profile (OFP) of an MQ-9A Block 5 Remotely Piloted Aircraft (RPA) and flew the MQ-9 using improved diagonal tails with conformal HF antennas incorporated into the leading edges.

The company claims that GA-ASI’s MQ-9 housed a FlexRadio Systems’ FLEX-6600 HF software-defined radio and associated hardware to translate and execute an autonomous mission plan. GA-ASI created a specialized HF software adapter to manage the unique latency and throughput constraints of the HF waveform to demonstrate BLOS command and control of the RPA.

The demonstration was flown out of Laguna Army Air Field/Yuma Proving Grounds on Dec. 16, 2020. The MQ-9 was commanded from Austin, Texas approximately 1,000 miles away over an HF C2 link. This capability is intended to enable an operator to task the MQ-9 without needing SATCOM, providing a means to operate in SATCOM-denied, contested environments.