Aerospace Instrument-Making Annotation << Back Examination of space observing information system based on space vehicle ballistic performances as well as mapping parameters and survey modes А.М. Малик, В.П. Макаров, М.Н. Добрыдник The analysis of operation of space information system (SIS) based on queueing theory was made, also the required performances of ground based complex of information processing depending on number of space vehicles included in the system, orbit altitudes, allowable angles of elevation of targets under control, times of survey cycles, average density of targets under control in the regions and other parameters were determined.