Station-keeping requirements

The problem of station-keeping is studied by means of analytical (linear theory) results. These equations describe the state-time history, in nondimensional form; and describe the influences of an initial (input) state and those from 'fixed' magnitude force systems. A discussion of station-keeping is presented; this points to the various phases of the problem; to the limitations and conditions involved; and, to the requirements which must be satisfied in maintaining one of the class/type solutions. The needs for a station-keeping operation are described, and the consequences of the inputs, and their relationship to one another are discussed. Other concepts which may be employed, for station-keeping, are mentioned; and, the known difficulties arising from their solutions are noted. Some comments regarding representative trace geometries, and planes of reference, are made relative to best selections for viewing and analysis purposes.