Deep Space Advanced Radar Capability (DARC)

DARC (Deep Space Advanced Radar Capability) is a trilateral space surveillance radar program developed by the United States, United Kingdom, and Australia under the AUKUS framework. DARC is designed to detect, track, and characterize objects in deep space—particularly objects in geosynchronous Earth orbit (GEO) and beyond, which are too distant for conventional space surveillance radars to effectively monitor.

Key aspects of DARC:

1. Three-site global coverage: DARC will consist of three sites strategically located around the world to provide 24/7 global coverage of deep space:

• Site 1: Exmouth, Western Australia — Operational in 2026, the world's first deep space radar
• Site 2: United Kingdom — Planned (likely at RAF Croughton or similar facility)
• Site 3: United States — Planned (likely in the continental US)

2. Exmouth location: DARC Site 1 is located at Exmouth, Western Australia, near the Harold E. Holt Naval Communication Station. The Exmouth location provides:

• Clear view of the southern hemisphere sky
• Minimal radio frequency interference (remote location)
• Existing defense infrastructure (Harold E. Holt station)
• Proximity to other space surveillance assets (C-band radar, space surveillance telescope)

3. Technical capabilities:

• Deep space tracking: DARC can detect and track objects at geosynchronous orbit (36,000 km altitude) and beyond, including satellites, debris, and potential threats
• High sensitivity: The radar is designed to detect small objects at extreme ranges, providing comprehensive space domain awareness
• 24/7 operation: The three-site network ensures continuous global coverage regardless of time of day or weather conditions
• Object characterization: Beyond simple tracking, DARC can characterize objects (size, shape, behavior) to identify potential threats

4. Northrop Grumman: DARC is built by Northrop Grumman, a major US defense contractor with extensive experience in radar systems and space surveillance. Northrop Grumman serves as the prime contractor for the DARC program.

5. Strategic significance:

• Counterspace threat monitoring: DARC addresses the growing threat of anti-satellite weapons and other counterspace capabilities being developed by Russia, China, and other nations
• Space domain awareness: Comprehensive knowledge of what is in space is essential for protecting allied space assets (communication, navigation, intelligence satellites)
• AUKUS space cooperation: DARC is one of the first major AUKUS space programs, demonstrating trilateral cooperation in the space domain
• Australian Space Command: DARC supports the Australian Space Command's mission of space domain awareness and space operations

6. Connection to existing Exmouth assets:

• The Exmouth site already hosts a C-band space surveillance radar (US-owned)
• A Space Surveillance Telescope (SST) was relocated from Diego Garcia to Exmouth
• The Harold E. Holt Naval Communication Station provides very low frequency (VLF) communication to submarines
• DARC adds deep space radar capability to this existing space surveillance hub

7. AUKUS framework:

• DARC is a trilateral AUKUS program, with all three partner nations contributing to and benefiting from the network
• The program demonstrates the AUKUS Pillar 2 commitment to space cooperation
• The three-site design ensures that all three nations host DARC infrastructure, sharing the capability and the strategic benefits

DARC represents a significant advancement in allied space domain awareness. As space becomes increasingly contested, with Russia and China developing sophisticated counterspace capabilities, the ability to monitor deep space objects is critical for protecting allied space assets and maintaining strategic advantage. The Exmouth site, operational in 2026 as the world's first deep space radar, marks a major milestone in allied space surveillance capability.