A radar is brought into operation during the multinational Digital Shield 2.0 allied air-defence data-integration exercise in Estonia, March 2026. Photo: Maj. Alexander Watkins, U.S. Army, via DVIDS (public domain). Illustrative of a NATO air-defence radar; not the specific system named in the NSPA opportunity.

NSPA Flags Two AESA Early-Warning Radars for Belgium, One Fixed and One Deployable, in a D/L-Band Air-Defence Buy

Technical Summary

The NATO Support and Procurement Agency (NSPA) has issued a Future Business Opportunity (FBO), a pre-solicitation market notice, for two advanced three-dimensional early-warning air-defence radars designated for Belgium. The notice, carrying the reference stem 26LD followed by a number not disclosed in the released text, describes two systems of identical core design: one in a fixed installation and one in a deployable configuration. An FBO is issued for information only. It is not a solicitation and does not commit NSPA to any procurement, so the release marks the opening of a competition rather than an award.

The primary sensor in each system is an Active Electronically Scanned Array (AESA) able to steer its beam electronically in both azimuth and elevation, with a Tactical Ballistic Missile (TBM) detection mode. Each radar carries a Secondary Surveillance Radar and Identification Friend or Foe (SSR/IFF) subsystem with Mark XIIB capability, which includes the cryptographically secure Mode 5. The requirement bundles auxiliaries such as a diesel generator and an uninterruptible power system, operator and maintainer training, and in-service support delivered through a Performance Based Contractor Logistics Support (PB-CLS) arrangement. Quality assurance is specified to ISO 9001:2015 and to Allied Quality Assurance Publications AQAP-2110, AQAP-2210 and AQAP-2105. The fixed site adds a radar tower with lightning protection and grounding, heating, ventilation and air-conditioning, a fire detection and suppression system and a crane, plus a radome, an office shelter, perimeter fencing and security cameras.

The single most useful line in the notice is the frequency footnote. NATO D-band spans one to two gigahertz, so the stated 1215 to 1400 megahertz is the same spectrum the IEEE calls L-band. The dual label is not a contradiction, it is the tell that this is a long-range L-band sensor. ISC technical reading of the NSPA Future Business Opportunity

Analysis of Effects

The band choice is the heart of the requirement. Long-range early-warning radars for air and missile defence cluster in the one to two gigahertz region because that spectrum trades angular precision for reach, power efficiency and weather penetration. A D/L-band AESA gives wide-area volume search and stable long-range tracking, which is exactly what a top-tier surveillance sensor needs to do: hold the widest possible air picture and cue the shorter-range fire-control radars and effectors beneath it. The TBM detection mode extends that picture into the lower exo-atmospheric and endo-atmospheric regime where tactical ballistic missiles transit, which is the discriminator that separates a modern air-defence radar from a plain air-surveillance set.

Reading the specification against systems already fielded in NATO points at a familiar shortlist. Leonardo's RAT-31DL family is the closest fit, because it exists in exactly the two forms the notice asks for: a fixed L-band solid-state 3D radar and the deployable RAT-31DL/M, which NATO ordered in 2023 and which packs into two twenty-foot ISO containers with a five-person crew and a stated setup time near two hours. Thales offers the SMART-L Multi-Mission line and Indra the LANZA family, both L-band and both credited with ballistic-missile detection. The specification also quietly rules systems out. Saab's Giraffe radars are strong multi-mission AESA sensors, but they work in the higher S, C and X bands, so they do not meet a D/L-band requirement. The fixed-plus-deployable pairing matters operationally: the fixed site gives persistent national coverage while the deployable set supports rotational NATO tasking or reinforcement of an exposed flank, both feeding the NATO Integrated Air and Missile Defence System (NATINAMDS).

Personnel and Safety Considerations

This is a sensor and infrastructure procurement rather than an ordnance one, so the safety envelope is electromagnetic and site-based rather than explosive. A high-power L-band emitter carries radio-frequency radiation-hazard (RADHAZ) implications: exclusion arcs around the array face, controlled zones for personnel and fuel, and siting clearances that keep the main beam off occupied structures. The Mark XIIB and Mode 5 subsystems bring cryptographic key management obligations that sit with the operating nation and NATO, not the airframe. The fixed-site scope names its own hazards and mitigations directly, the lightning protection and grounding, the fire detection and suppression system, and the heating and ventilation plant that keeps a solid-state array within its thermal limits. The radome shields the array face from weather while preserving the low-sidelobe performance a long-range sensor depends on. Any handling or emission risk assessment for the deployed system would need the manufacturer's radiation-hazard data, which is not part of an FBO.

Data Gaps

Several load-bearing facts are not in the released notice and are flagged here rather than assumed. The full FBO reference number is redacted in the released text, shown only as the 26LD stem. No estimated contract value is stated. No original equipment manufacturer is named; the notice lists the OEM fields as not applicable, consistent with an open competition rather than a sole-source direction. There is, as of publication, no separate Belgian Ministry of Defence statement publicly tying this radar requirement to the wider 3.1 billion euro ground-based air-defence package, so the link is inferred from the BEL designation and the capability logic, not confirmed. The timing of any Request for Proposal, the number and type of long-range radars Belgium currently operates, and the instrumented range or performance figures for any specific candidate system are all unverified against primary sources.

Corrections & updates welcome. If you hold open-source data that refines or corrects any parameter in this article, please contact [email protected] citing the specific claim and your source. Verified corrections will be incorporated and credited in the revision history. AI-assisted technical assessment based on open-source material. Not a formal intelligence product.