The Communications Subsystem

As we recall from Chapter 7, the prime functions of the communications subsystem are to provide a communications link with the ground, to downlink payload data and telemetry, and to uplink commands to control the spacecraft. This is a fairly intuitive task involving the requirement for two-way communication between the spacecraft and the ground. Any activity in orbit, such as taking measurements of the space environment or imaging a galaxy, requires a means of communicating the data to the ground, otherwise there's no point to doing it!

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