IN Brief:
- Hisdesat has selected Airbus Defence and Space as prime contractor for SpainSat NG-III.
- Active X-band antennas will allow rapid coverage reconfiguration and interference mitigation.
- The spacecraft will complement SpainSat NG-I and extend protected coverage across major operating regions.
Airbus Defence and Space has been selected by Hisdesat as prime contractor for SpainSat NG-III, the next secure communications satellite in Spain’s sovereign military network. Airbus will lead spacecraft design, integration, and testing, while Spanish industry takes responsibility for major payload elements across X, military Ka, and UHF frequency bands.
The programme builds on the SpainSat NG-I and NG-II spacecraft launched in 2025. SpainSat NG-III will complement the first of those satellites in orbit and extend protected coverage across the Americas, Europe, Africa, and the Middle East. Together, the configured footprint is intended to provide secure communications across roughly two thirds of the Earth’s surface.
Airbus’s principal payload contribution is a pair of active X-band antennas covering transmission and reception. The electronically controlled system is designed to provide the functional coverage of 16 conventional antennas, while allowing beams and service areas to be reconfigured as frequently as 1,000 times per second. That rate of change is intended to help the operator adapt capacity, identify interference, and alter coverage without physically repointing a traditional fixed-beam payload.
Thales Alenia Space in Spain will lead the UHF and military Ka-band payloads. Dividing the payload across specialist industrial teams gives the programme access to established national expertise, but it also creates a demanding integration task. Antennas, processors, power systems, thermal management, flight software, and ground control must operate as a single protected service once the satellite is in orbit.
The spacecraft is being designed to resist jamming and spoofing and to remain protected against the electromagnetic effects associated with high-altitude nuclear events. Those requirements affect more than the radio payload. Shielding, redundancy, component selection, software assurance, and system-level verification all have to be considered during design and test, particularly where a satellite is expected to support government and military users through disruption.
SpainSat NG-III also reflects the shift from fixed satellite coverage towards software-defined and electronically reconfigurable communications. Conventional military satellites were often built around beams designed years before launch. Active antennas and digital processing allow operators to move capacity as demand changes, respond to interference, and support different theatres from the same orbital asset. That flexibility is valuable, but it transfers additional complexity into onboard electronics, control software, and ground-segment planning.
Hisdesat’s wider SpainSat NG programme has been structured to retain a substantial share of work in Spain, with national industrial participation exceeding 40 per cent on the earlier spacecraft. Airbus’s Spanish operation has led X-band payload integration, while Thales Alenia Space Spain has taken responsibility for Ka- and UHF-band elements. NG-III continues that pattern, reinforcing a domestic engineering base around secure communications rather than procuring a completed spacecraft as an imported service.
No contract value, planned launch date, launcher, or final orbital slot has been published. The release also leaves the satellite bus configuration unspecified. Cost and schedule therefore remain open, while the prime-contract award fixes the industrial structure for design and integration.
Qualification must address the combination of high-power radio-frequency equipment, protection requirements, and a long operational life. Ground testing will reproduce electrical, thermal, vibration, and electromagnetic conditions expected from launch through service. Once deployed, most hardware cannot be repaired, making component assurance and system verification central to both engineering and programme risk.
SpainSat NG-III now moves from contract award into detailed design, payload production, integration, and qualification. With no launch date published, progress will first appear through factory and test milestones as the reconfigurable communications architecture becomes flight hardware.
The third spacecraft will add capacity and reduce reliance on a single orbital node within the protected communications network. Hisdesat has not published traffic-allocation or redundancy arrangements between NG-I and NG-III. Those decisions will be implemented through the ground segment and reconfigurable payloads once the new spacecraft becomes operational.
The active-antenna arrangement also changes ground-segment work. Operators will need planning tools and procedures that translate mission priorities into beam shapes, frequencies, and capacity allocations while maintaining interference protection and authorised access. Rapid electronic reconfiguration is useful only where commands can be validated and executed without creating conflicts elsewhere in the payload. Spacecraft software, network management, and operator training therefore enter the same qualification chain as the radio-frequency hardware. The qualification programme must keep those operational controls aligned with the final payload configuration.
