DEFINITION:

Covers both spacecraft TT&C/PDM techniques and technologies, space-link communications (RF, hybrid RF/optical systems, signal coding/modulation, ranging techniques, radio science experiments) and proximity links.

(Source: ESA TD 6C)

SUBDOMAINS:

1. TT&C System Tools: Covering all aspects related to TT&C systems (coding, modulation, multiplexing, link analysis, interference) and subsystem analysis tools and methodologies.
2. Deep-Space Transponders: Covering all aspects related to the design and development of deep-space TT&C transponders.
3. Near-Earth Transponders: Covering all aspects related to the design and development of near- Earth TT&C transponders.
4. Proximity Link: Covering all aspects related to the design and development of units for proximity link applications.
5. High-speed Downlink PDM: Covering all aspects related to (coded) modems for high-speed payload downlink (e.g. for EO, DRS applications).