Satlk

Satlk is an informal term used to describe satellite link protocols and interfaces that carry data between ground systems and one or more satellites. The term is not tied to a single specification; it often appears in vendor documentation, open-source projects, and academic literature as a generic label for the data link and path management aspects of satellite communications. In practice, satlk implementations may vary in complexity and capability but share common goals: to reliably transport user data over a radio link that is subject to long round-trip delays, Doppler shifts, and variable link quality.

A typical satlk stack includes a physical layer interfacing a modem, a data link layer that provides framing, addressing, and error control, and a network or transport layer for routing and session management. Many satlk designs incorporate forward error correction, link adaptation, and handover support for mobile or LEO constellations. Time and Doppler compensation, idle-time management, and buffering are standard concerns.

There is no universal satlk standard; however, CCSDS standards for space data link and telemetry/telecommands are commonly used as references. Some satlk implementations are designed to be CCSDS-compliant in order to interoperate with space missions, ground stations, or other satellites.

Applications and usage examples include satellite telemetry, tracking, command and control, weather and earth observation data downlinks, and backhaul for remote networks. In industry, satlk may appear in ground segment software, payload data handling, and satellite gateway equipment.

See also: Satellite communications, CCSDS, Satellite modem, Space data link layer.