TRM

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Definition

Noun: * The coordinated universal time when a transmission is sent from Earth to a spacecraft or other celestial body: A specific, standardized timestamp (in Coordinated Universal Time, UTC) marking the exact moment a signal or command is transmitted from a ground station on Earth to a vehicle or object in space.

Usage
  • is a specialized technical term used primarily in the fields of spacecraft operations, astronautics, and deep space network communications.
  • It functions as a countable noun and is often used with articles () or as part of a data record.
  • It is a critical parameter for calculating signal travel time and for synchronizing activities between Earth and the spacecraft.
Examples
  • The TRM for the command sequence was logged as 2023-10-26T14:30:00Z.
  • Engineers analyzed the TRM to determine if the signal was sent during a period of solar interference.
  • A delay between the TRM and the time the signal is received (TRC - Time of Receipt at the Craft) is used to calculate the spacecraft's distance.
Advanced Usage
  • TRM vs. TRC: In space communication, (Time of Receipt at the Master station/Time of Reception of the Master) is often paired with (Time of Receipt at the Craft). refers to the time a signal is on Earth from the spacecraft, while the provided definition refers to the time a signal is from Earth. The precise meaning can depend on the specific agency's or project's terminology. The given definition is for the transmission event.
  • As a data point: is a key data point in telemetry and command logs, essential for diagnostics and reconstructing mission events.
Variants and Related Words
  • UTC (Coordinated Universal Time): The time standard used for .
  • Emission Time: A more general phrase for the time a signal is sent.
  • Time Tag: A general term for a timestamp associated with a command or data packet.
Synonyms
  • Transmission Time
  • Uplink Time
  • Signal Emission Time
Antonyms
  • Reception Time (the time a signal is received, e.g., on the spacecraft or back on Earth).
  • TRC (Time of Receipt at the Craft) (when the context defines TRM as the transmission time from Earth).
Noun
  1. the coordinated universal time when a transmission is sent from Earth to a spacecraft or other celestial body

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