Full Name Tactical Satellite-4 Status Operational (nominal)
Mission Agencies DoD (USA) Launch Date 27 Sep 2011
Mission Links EOL Date Sep 2031
EO Portal Info NORAD Catalog #
International Designator
Orbit Type Highly elliptical Orbit Period 240 minutes
Orbit Sense Orbit Inclination 63.4 deg
Orbit Altitude 6375 km Orbit Longitude
Orbit LST Repeat Cycle
Objectives and Applications Overall mission objectives: Demonstration of a high dwell time ORS capability via a HEO (Highly Elliptical Orbit). Evaluation of Phase 3 system level bus standards in a realistic I&T, launch and flight operations environment. Demonstration of mobile data communications services. Particular goals are: Provision of TacSat/ORS COTM (Communications-on-the-Move) radio capability (legacy and MUOS-like wideband) where MUOS (Mobile User Objective System). The goal is to arrive eventually at the JTRS (Joint Tactical Radio System) which enables various radio types to communicate with each other, leading to a family of interoperable, software-defined radios. Collection of BFT (Blue Force Tracking) devices in underserved areas. Perform buoy/sensor Data-X on Moderate-to-High Power Transmissions.
Mission Measurements
Mission Instruments
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