Command and data handling systems are the core functions of the spacecraft, they let you control the system and communicate with it. Central to that is the flight computer, backed up by a number of radios and other ancillary interfaces.
Command and data handling systems are the core functions of the spacecraft, they let you control the system and communicate with it. Central to that is the flight computer, backed up by a number of radios and other ancillary interfaces.
The LDRR provides TT&C capabilities for a mission in a compact, configurable package. Various daughtercards are added to the system to provide access to different bands and ultimate mission flexibility. On missions without a dedicated watchdog, the LDRR can be configured to accept contingency commands from the ground directly and perform limited actions to recover a system in an anomalous state.
The Terran Orbital Watchdog is a secondary, ‘sidekick’ processor which allows a single spacecraft to carry multiple flight computers, and moderates between them, ensuring that only one computer is actively controlling the spacecraft at one time, and the second module is available as a hot or cold spare. The watchdog also manages some anomaly resolution features, such as long duration timers.