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Definition

Technology Readiness Level

TRL

A 1-9 scale defined by NASA and DoD for measuring the maturity of a technology, from basic principles observed (TRL 1) through flight-proven (TRL 9). Used to assess program risk.

Related terms

Test Readiness ReviewTRR

A phase gate review confirming that the test program, test procedures, test facilities, and test articles are ready for ...

Thermal Control SystemTCS

The subsystem that maintains spacecraft temperatures within acceptable ranges. Uses passive methods (coatings, MLI, radi...

Two-Line Element SetTLE

A standardized 70-character text format for representing the orbital elements of an Earth-orbiting object at a specific ...

True Anomaly

The angle from periapsis to the spacecraft's current position, measured at the focus of the orbital ellipse. Tracks wher...

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