Definition: The term "Petcom3" appears to be a technical term related to electrical communication systems, specifically those in use in spacecraft navigation systems. It signifies an advanced set of specifications for communicating with external spacecraft using satellite-based signals. In simpler terms, it means precise control and management over various aspects of a spacecraft's operations, including telemetry (communication) and maneuvering data. This involves not just receiving but also processing the information to ensure safe and effective operations within the spacecraft system. It is crucial in systems that require real-time coordination between spacecrafts, as well as for navigation and mission planning where precise timing and control are paramount.