The functions performed by the DMSP Command, Control, and Communications Segment (C3S) are shown in the DMSP Command Control and Communications Diagram.
The Mission Planning function receives requests from users for stored and real-time mission data. In addition, mission requirements and constraints on the current capabilities of the satellite are received. These are processed to automatically produce the data files used to control the DMSP satellites.
The Commanding function incorporates a macrocommand capability for use in constructing command sequences. This capability allows operations to be viewed at a very high level. For instance, the macrocommand "Load and Verify Ephemeris" is a collection of many individual spacecraft commands.
The telemetry data can be received either concurrent with, or independent of, the commanding activity.
Computers integrate the real-time EST, commanding, and stored EST functions to support a specific satellite.
Real-time EST processing provides parameter display for analysis. Satellite subsystems, out-of-limits, and dwell (single-point monitoring) telemetry displays are provided to the analysts on color-graphic terminals. In addition, telemetry values can be presented graphically on these terminals, and on hard-copy strip charts.
A virtual playback capability is also provided to enable the analyst to replay significant events. The replay allows slow-motion viewing of the EST. Once contact with the satellite has ended, the stored telemetry and real-time telemetry are merged into a single database for postpass computer analysis.
In the interactive mode, the analyst can retrieve information from the telemetry database and perform analyses. Menus lead the data analyst through the system. Results are displayed on the operator's terminal.
In the batch mode, repetitive and time-consuming processing can be executed more rapidly. The batch mode can be initiated directly from the console, or be delayed awaiting a specific event, e.g., completion of the current pass.
Engineers/analysts can search the database for out-of-limit parameters or other significant situations. Multiple orbits of data can be scanned. Special user-defined retrieval algorithms are available to the analyst to aid in searching.
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