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7.3.4 Real-Time Configuration Changes
Changes to the operating conditions or configuration of a TDRSS KuSA return service
during a scheduled service support period are initiated by a GCMR from the customer
MOC. The requested changes will be implemented within 35 seconds of receipt of the
GCMR at the SN ground terminal. The MOC will be notified upon initiation of the
requested changes via GCM. Additional information concerning SN ground terminal
response times for GCMRs is provided in Section 10. Table 7-8 lists the KuSA return
service real-time configuration changes and their effects on the return service.
7.3.5 Autotrack/Signal Acquisition Scenarios
The following acquisition scenario identifies only the technical aspects of TDRSS KuSA
return service autotrack (if enabled) and signal acquisition by the SN ground terminal
and does not include operational procedures related to acquisition. Acquisition is
dependent upon the customer providing an ephemeris with a maximum epoch
uncertainty as defined in Table 7-7:
a. TDRS SA Antenna Pointing:
1. KuSA Autotrack Description. The TDRSS KuSA return service autotrack
process (if enabled) will acquire and track a customer platform KuSA
return service signal providing an improved pointing of the TDRS SA
antenna in the direction of the customer platform. This decreases the
required Prec at the input to the TDRS antenna. TDRSS KuSA return
autotrack service is independent of whether the return signal is coherent
or noncoherent relative to a TDRSS KuSA forward service signal or
whether a TDRS forward service signal is concurrently scheduled.
Revision 10 7-34 450-SNUG