Systems for TOPEX/Poseidon may be divided at a high level into three functions. The Launch Vehicle System, responsible for delivering the spacecraft into a safe orbit, the Spacecraft Systems, composed of the spacecraft itself and the instruments on board, and finally the Ground Systems, necessary for the maintenance and operation of the Spacecraft Systems and the production of science data.
The functions of these systems are equally important and depend absolutely upon each other to achieve the common goal of continuously monitoring the level of the world's oceans.