How Trump's Golden Dome Missile Defense Will Work | WSJ

Key Concepts:

• Golden Dome: President Trump's proposed $175 billion missile defense shield.
• ICBM (Intercontinental Ballistic Missile): A long-range missile that travels in a high arc.
• FOBS (Fractional Orbital Bombardment System): A missile launched into a partial orbit, flying much lower and approaching targets from unexpected angles.
• Boosted Hypersonic Glide Vehicle: An intercontinental missile that can maneuver and evade defenses, traveling at speeds greater than Mach 5.
• Sensor Layer: A network of tracking satellites to detect and track missiles.
• Space Interceptors: Satellites designed to intercept and destroy missiles in space.

1. The Challenge: Evolving Missile Technology

• Traditional ICBMs are detectable and trackable due to their predictable, high-arc trajectory.
• FOBS missiles present a challenge by flying much lower, under radar, and approaching from unexpected angles. This reduces warning time.
• Hypersonic glide vehicles are even more difficult to intercept because they can maneuver and change course mid-air at speeds exceeding Mach 5.

2. The Golden Dome Solution: A Multi-Layered Defense

• The Golden Dome aims to create a comprehensive missile defense system using advanced space-based technology.
• Sensor Layer: A critical component involves deploying hundreds, potentially thousands, of satellites to track missiles as they maneuver. These satellites would detect, track, and calculate missile trajectories. The Pentagon is already developing this sensor layer.
• Space Interceptors: The US wants to develop space interceptors that could destroy missiles earlier in their flight path. The exact design is not finalized, with concepts including "mother and daughter" interceptors.

3. Controversies and Concerns

• The deployment of space interceptors raises concerns about the potential for offensive use. They could be used to target satellites belonging to other nations like China or Russia, potentially escalating tensions and triggering an arms race in space.
• China has publicly voiced its opposition to the Golden Dome, reflecting these concerns (Mao Ning's statement in Mandarin, indicating China's unhappiness).

4. Historical Context and Challenges

• President Trump's stated goal is to complete the Golden Dome for $175 billion by the end of his term. Experts suggest the cost could be higher and the timeline longer, if the project is completed at all.
• Past missile defense initiatives, like Ronald Reagan's, have failed due to high costs, technological limitations, and international pressure.

5. Key Arguments and Perspectives

• President Trump frames the Golden Dome as essential for national security, emphasizing the need to "be around for a long time."
• Defense officials emphasize the need to counter the maneuverability and evasiveness of new missile technologies.
• Critics and competitors are concerned about the potential for weaponization of space and the escalation of international tensions.

6. Technical Terms and Concepts

• Mach 5: Five times the speed of sound.
• Infrared Signatures: Heat emitted by objects, used to detect missile launches.

7. Logical Connections

• The advancement of missile technology (FOBS and hypersonic glide vehicles) necessitates an upgrade to existing defense systems.
• The sensor layer is designed to address the challenges posed by missile maneuverability.
• Space interceptors are intended to provide an earlier interception capability but raise concerns about weaponization of space.

8. Synthesis/Conclusion:

The Golden Dome represents an ambitious plan to enhance US missile defense capabilities by leveraging advanced space-based technology. While proponents argue it's crucial for national security in the face of evolving missile threats, concerns persist regarding its cost, feasibility, and potential to trigger an arms race in space. Overcoming these technological, financial, and geopolitical obstacles will be crucial to its success.