Archives: Glossary Terms: 691 terms

DSN Tracking System. Also, Tracking data.

Transmission Time, UTC Earth time of uplink.

An object orbiting in the Lagrange points of another (larger) object. This name derives from a generalization of the names ...

A tropical year is the time it takes Earth to complete a full orbit around the Sun. Its duration varies ...

The angular distance of a point in an orbit past the point of periapsis, measured in degrees.

The time after sunset or before sunrise when the sky is not fully dark. Astronomical twilight ends after sunset (and ...

Two-Way Non-Coherent mode, in which a spacecraft's downlink is not based upon a received uplink from DSN.

Communications mode consisting of downlink received from a spacecraft while uplink is being received at the spacecraft.

Traveling Wave Tube, downlink power amplifier in a spacecraft telecommunications subsystem, the final stage of amplification for downlink (same unit ...

Traveling Wave Tube Amplifier, downlink power amplifier in a spacecraft telecommunications subsystem, the final stage of amplification for downlink (same ...