8.2.1 — Coast Guard Operations — maturity: live

Exclusive Economic Zone Surveillance

Persistent, wide-area monitoring of a nation's 200 nautical mile Exclusive Economic Zone using satellite radar, RF collection and optical imagery to enforce sovereign maritime rights.

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An EEZ is a legal construct that only becomes real when a state can see what is happening inside it. Most coastal nations — even mid-sized ones — lack the patrol vessel hours, maritime patrol aircraft and shore-based radar to cover their full 200 nm zone with anything approaching continuity. The result is a surveillance gap that foreign fishing fleets, illegal transshipment operations and state-sponsored survey vessels exploit routinely and with near-impunity.

A layered satellite stack closes that gap. Wide-swath synthetic aperture radar (SAR) detects vessels in all weather and at night, with daily revisit across the entire zone. RF survey payloads harvest AIS, VDES and radar emissions to classify and fingerprint vessels independently of their declared identity. Optical passes confirm identity and activity — net deployment, pumping operations, crew transfers — on targets already cued by radar or RF. The combination produces a recognised maritime picture that is both legally defensible and operationally actionable.

The operational outcome is a coast guard that can dispatch assets with purpose rather than on patrol schedules. Commanders receive cueing within minutes of a detection event, can cross-reference vessel history and flag-state data on a single console, and can document violations with satellite evidence admissible in flag-state proceedings. Nations that have deployed equivalent capability — Norway, Australia, Canada — report measurable deterrence effects within twelve months of full operations.

What matters

A 200 nm EEZ covers up to 125,000 square nautical miles; no patrol fleet can achieve continuous coverage without satellite cueing.
SAR-RF fusion exposes vessels that disable or spoof AIS, the single most common evasion tactic used by illegal operators.
Satellite imagery collected under sovereign custody is court-admissible evidence in ITLOS and domestic fisheries tribunals without third-party disclosure.
Foreign commercial satellite providers can throttle, deprioritise or deny imagery of politically sensitive events inside your own EEZ without legal recourse.

Sovereignty score: 9/10 — A nation that cannot independently surveil its own EEZ cedes effective control of its sovereign maritime estate to whoever has the satellites.

Commercial satellite providers headquartered in foreign jurisdictions are subject to their government's export control and national security orders, meaning imagery of your EEZ can be withheld or shared with third parties at a foreign state's discretion.
EEZ enforcement actions — vessel seizure, fines, prosecution — require evidentiary chains of custody that are legally compromised when the imagery originates from a private vendor that can be subpoenaed or pressured by a flag state.
Geopolitical rivals routinely deploy survey and fishing vessels into contested EEZs precisely during periods when commercial constellation access is diplomatically constrained; sovereign tasking authority eliminates this vulnerability.
Dependence on third-party tasking schedules means surveillance gaps are predictable and exploitable; sovereign operators can surge revisit rates over specific zones in response to intelligence without seeking external approval.

Reference architecture

Payload: Primary: C-band or X-band SAR, 3–5m stripmap resolution, 200km swath for area search; 1m spotlight mode for vessel identification. Secondary: RF survey payload, 100 MHz to 6 GHz, AIS/VDES decode plus radar-emission geolocation to 500m CEP. Tertiary: RGB/NIR push-broom imager, 3m GSD for optical confirmation passes.
Bus class: ESPA-class microsat, 120–180kg, 600W payload power; SAR units may run to 200kg with deployable antenna. RF-only secondary payloads hosted on 16U cubesats at 12kg to reduce per-unit cost.
Orbit: Sun-synchronous LEO at 520–580km; 18-satellite walker constellation (12 SAR/optical + 6 RF cubesats) achieving average 2-hour revisit over a mid-latitude 200 nm EEZ; orbital phasing optimised for dawn-dusk SAR illumination geometry.
Ground segment: 2 sovereign ground stations (X-band downlink, S-band TT&C) positioned for maximum EEZ pass coverage; third station at a trusted partner site for redundancy; SatNOGS nodes provide housekeeping telemetry backup on 437 MHz UHF.
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References

UNCLOS Article 56 — Rights, jurisdiction and duties of the coastal State in the EEZ — Article 56 grants coastal states sovereign rights over living and non-living resources within 200 nautical miles, with explicit jurisdiction over marine scientific research and environmental protection. Effective exercise of these rights is contingent on the ability to detect and document violations.
IMO Resolution A.1106(29) — Revised guidelines for the onboard operational use of shipborne AIS — IMO guidelines mandate AIS carriage but acknowledge that deliberate switch-off remains a persistent enforcement problem. Independent satellite surveillance is the primary means of detecting non-compliant vessels in remote EEZ areas.
UNODC — Illicit Trafficking at Sea: A Global Overview — UNODC assessments consistently identify EEZ surveillance gaps as a primary enabler of maritime crime including drug trafficking, IUU fishing and migrant smuggling. Nations with persistent space-based monitoring report higher interdiction rates.
FAO — Monitoring, Control and Surveillance of Fishing Vessels — FAO estimates that illegal, unreported and unregulated fishing costs the global economy USD 23 billion annually, with EEZ surveillance deficits in developing coastal states a leading structural cause. Space-based monitoring is identified as a scalable solution.
European Space Agency — Copernicus Maritime Surveillance Service — ESA's Copernicus programme demonstrates the operational viability of satellite-based EEZ monitoring at continental scale, combining SAR, optical and AIS data streams into an integrated maritime picture. Sovereign national systems replicate this architecture at a state level with full data custody.