2.1 SATELLITE INTERFACES
Kodiak Tracking Station is required to operate with satellites that may differ from each other in their space paths, and in the frequency, type of telemetry, and power requirements of their electronic equipment. The top level system block diagram for KTS shown in Figure 2-1 illustrates the overall configuration required to interface with satellite systems.
In order to interface with the Satellite systems supported by the SCF, the station must have the capability to support the satellite trajectories and frequencies described in the following paragraphs.
2.1.1 Satellite Trajectories
The requirement for acquisition, tracking, telemetry and command coverage applies to satellite tractories (including near-circular, transfer, and maneuvering orbits) having the following characteristics:
Altitude Range(nmi) Inclination Low 100 - 500 Polar and near-polar Medium 500 - 20,000 Polar and near-polar Reentry 4000 - horizon Polar and near-polar2.1.2 Frequency Bands
Satellite acquisition, tracking, telemetry and command transmission support shall be provided within the following frequency bands:
Signal Frequency Receive Receive 225 - 260 MHz VHF 2.2 - 2.3 GHz SGLS/ Non-SGLS Auto Track 225 - 260 MHz VHF SGLS 2.2 - 2.3 GHz SGLS/ Non-SGLS Transmit 370 - 470 MHz UHF 1.75 - 1.85 MHz S-band2.2 MISSION SUPPORT FUNCTIONAL REQUIREMENTS
In the top level functional flow diagram of Figure 2-2 the blocks depict basic requirements applicable to the development and operation of the station. Only those requirements pertaining to mission support are addressed herein.
Lower-level block diagrams of the mission support function -- generally
independent of program or station configuration peculiarities -- identify
essential support functions and provide a logical framework for hardware,
software and procedural development. Mission support (function 1.0 )
includes the pass operations functions (acquisition, tracking, telemetry
readout, and commanding), and is illustrated in the first level functional
flow diagram, Figure 2-3. Pass operations (function 1.4) are further
illustrated in the second-level functional diagram, Figure 2-4. Each of the
pass operations functions is discussed individually in the following
The tracking, telemetry, and command (TT&C) antenna subsystem shall be capable of acquiring satellites on the main antenna beam at 3 deg above the horizon and with a 99.9 probability of success (for spatial intercept), under the following conditions:
The first function, illustrated in the block diagram of Figure 2-6, shall provide for positioning of all antennas and for track data generation by the 14-ft TT&C and the 200 MHz Autotracker antenna subsystem as described below:
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