Tech • IA • Crypto
They track ghost ships from space
5/10TL;DR
A French startup is using radio-frequency detection from space to track ships that deliberately turn off their location beacons, exposing illegal and covert maritime activity.
KEY POINTS
Invisible ships at sea
Vessels can disappear from conventional tracking systems by switching off their AIS transponders, a legal requirement for many ships. This creates blind spots across vast ocean areas where activities such as illegal fishing, sanctions evasion, and covert operations can occur undetected.
A new space-based approach
Unseenlabs, a startup founded in Brittany, deploys small satellites equipped with radio-frequency sensors rather than cameras. These satellites detect emissions from onboard electronics, allowing them to locate and track ships even when official tracking systems are disabled.
Tracking unique RF signatures
Each vessel emits distinct radio-frequency patterns influenced by its equipment, configuration, and wear over time. By analyzing these signals, the system can differentiate and monitor ships over months, effectively assigning each a unique “fingerprint” without relying on declared identity data.
Single-satellite detection breakthrough
Unlike traditional triangulation methods that require multiple satellites, the company has developed a way to geolocate emitters using a single satellite. This reduces cost and complexity while enabling scalable coverage of large maritime zones.
Wide-area, all-weather surveillance
RF sensing works day and night and is unaffected by cloud cover, unlike optical imaging. Satellites can scan immense areas in a single pass, making them particularly effective for initial detection before other systems, such as imaging satellites, are deployed for confirmation.
Revealing suspicious maritime behavior
Analysis has identified vessels exhibiting abnormal patterns, including ships making unexplained loops over subsea cable routes. In one case, a vessel previously tracked in another region displayed similar behavior months later near critical infrastructure, suggesting potential involvement in cable disruptions.
Combating illegal fishing and “ghost fleets”
The technology has exposed industrial-scale illegal fishing, where ships deactivate tracking systems to operate in restricted waters and transfer catches at sea. It also helps monitor so-called “ghost fleets” used to bypass sanctions, particularly in the trade of restricted commodities like oil.
Dual-use applications
Clients include governments, defense agencies, and private firms such as S&P Global, which use the data for maritime intelligence and economic analysis. Applications range from enforcing environmental protections to monitoring geopolitical risks.
Expansion beyond maritime use
A new generation of larger satellites, weighing 120–150 kg, aims to extend RF monitoring to land-based signals. Potential uses include detecting unauthorized spectrum use and mapping telecommunications activity across entire countries in near real time.
Lower-cost satellite deployment
By leveraging compact satellite designs and commercial launch providers, missions can be conducted for a few million euros. Early launches even involved transporting satellites as carry-on luggage before integration into rockets operated by companies like Rocket Lab.
CONCLUSION
Radio-frequency sensing from space is closing critical gaps in global maritime surveillance, offering a powerful tool to uncover hidden activities and reshape how oceans are monitored and regulated.