Space is becoming a contested arena as nations deploy satellites to protect their assets from hostile approaches, with new technologies like magnetic capture and inspector satellites emerging as key defenses.
Space threats grow with neighboring satellites
In recent years, the risk to satellites has expanded beyond space debris to include deliberate actions by other satellites. Countries are now investing in technologies to protect their space assets. For example, a Russian satellite, Kosmos-2612, was recently observed approaching a Finnish radar satellite, ICEYE-X36, which provides imagery used by Ukraine. This behavior was described as "threatening" by a U.S. official.New UK initiative to defend satellites
The United Kingdom has launched a new program to enhance its satellite protection capabilities. It has awarded a 15 million pound contract to Astroscale for the LEDA project. This program involves developing satellites that can detect and respond to hostile approaches. The technology, ELSA-d, uses a magnetic capture system to manage space debris, but in this case, it would be adapted to monitor and react to suspicious satellites.Cost and timeline for UK's satellite defense
According to defense officials, a prototype of the UK's satellite defense system could be ready in less than three years, at about 1% of the cost of a major military satellite network like Skynet. The goal is to protect critical infrastructure that supports the economy, society, and military.Other countries also developing space defenses
The United States has already deployed satellites that can inspect and maneuver near other satellites. France is developing the YODA demonstrator, with a planned successor called EGIDE. Germany, Japan, and India are also exploring similar technologies. However, experts note that Western countries currently lag behind Russia and China in these capabilities.Patrol force concept for satellite protection
Alex Godfrey of Astroscale proposes a "patrol force" concept, where a single satellite could monitor multiple allied satellites. This approach would allow smaller countries to share the responsibility of protecting critical space assets, reducing the need for each nation to maintain its own full satellite defense system.What is a rendezvous and proximity operation?
A rendezvous and proximity operation (RPO) involves a satellite maneuvering close to another, maintaining a short distance, or following it. This requires precise navigation using optical sensors, radar, and thrusters to adjust the trajectory. The same technology can be used for both legitimate tasks like maintenance and for potentially hostile actions like espionage or collision.How does magnetic capture work in space?
Magnetic capture, as used in Astroscale's ELSA-d technology, involves using a magnet to attach to a ferromagnetic object in orbit. This allows for stabilizing and moving the object, such as debris, without complex mechanical systems. However, it requires the target satellite to be compatible with the magnet, which can limit its use. For protection, the focus is on maneuvering close to another satellite rather than capturing it.What makes an inspector or bodyguard satellite effective?
An inspector satellite uses optical imaging and trajectory analysis to observe other satellites. A "bodyguard" satellite adds the ability to position itself defensively, such as between a critical satellite and a potential threat. To be effective, it needs advanced sensors, reactive thrusters, and autonomous systems to detect and respond to threats quickly. These capabilities are also used in both defensive and offensive operations, which is why monitoring behavior in orbit is crucial.
