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The
specifications performance
and functional system's outlined in the following sections.
5.1
5.2
System Timing
are
in the
shall system
with the
such as
be
performed
requirements
ranging
or
to for satellite
a the
Event timing precision commensurate
of operations processing of commanding but shall be no less than 0.5 seconds.
Real-Time Data Acquisition
form suitable
control the
Software shall be included in the system to appropriate GCE units and to collect and package data in a
and storage, suitable for display,
any processing stationkeeping or satellite necessary for
performance analysis. The data shall be identified by data type and satellite and shall be time-tagged (year, month, day, hour, minute, second, UTC). All data conversions from raw form to engineering units shall be in systeme internationale d'unites (SI) metric units. The operation of the data acquisition system shall be under operator control and will allow the operator to independently initiate or terminate
each data acquisition
collection
for
to set
appropriate, archiving of data.
5.2.1 PCM Telemetry Data
The
include
type
of rates
software
to
data
and,
for storage
where
and
from accept data
and to read and Data from each telemetry
system shall telemetry decommutator (Section 4.2.4); synchronize the telemetry data. frame shall be processed.
the
archiving
compression
for controlled
telemetry
to
be data
There shall be a facility, under operator control,
to parameters specify
be utilized during telemetry stream processing. These parameters shall govern
archive of
data based upon archive deltas) and shall (i.e. significant change separately
each analogue telemetry word. All changes in satellite status shall be archived. The capability for a periodic (e.g. 2 hour) archival telemetry data shall be incorporated to ensure that slowly The archiving strategy changing parameters are recorded.
the satellite shall be
be such that a complete record of the history can be created while minimizing the amount of data to be processed and stored by the system.
Each
time-tagged
and the
of
source
be shall record data identified so that the significance of all data words can be determined. There shall be provision for converting all
telemetry data from
units to analogue
raw telemetry engineering unita. In addition, there shall be software to check analogue data values against upper and lower limits
the limits to control, set under operator
to
be
be
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