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Tacsat 4


Designation 37818 / 11052A
Launch date 27 Sep 2011
Country of origin United States
Mission military technology demonstrator
Perigee/Apogee 748 / 12000 km
Inclination 63.6°
Launch vehicle Minotaur #13

Operated by the US Navy.

Experiments with new satellite communications techniques.

To test communications-on-the-move for existing radios without requiring antenna pointing and providing 10 Ultra High Frequency (UHF) channels. It provides flexible up and down channel assignments, which increases the ability to operate in busy, and sometimes restrictive, UHF environments.

The project will potentially provide the option for launching smaller highly elliptical orbit (HEO) satellites and enabling 24-hour coverage in multiple regions simultaneously, allowing the military to achieve the benefits of a combined HEO and geosynchronous orbit constellation.

sat-index articles

Technical data


Prime contractor NRL
Platform ORS
Mass at launch  
Dry mass  
Solar array  
DC power  
Design lifetime  

Beacon at 2206.10 MHz

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