November 8-10, 1991 - Klofas.com

Table 10
Summary of Validation Criteria Measurements
for Multiple Replications
Sallple No. 7
-­ Run No. 1 -­ -­ Run No. 2 -­ -­ Run No. 3 -­
% of % of % of
Actual % of Actual % of Actual % of
Total or Sill. Total or Sill. Total or Sill.
Category Total Category Total Category Total
Total Bytes -7.7 -7.0 -6.4
File Server -14.9 47.6 -13.7 47.9 -13.3 47.8
Broadcasting -0.4 45.9 -0.6 45.5 +0.3 45.6
Telemetry +5.8 6.5 +5.7 6.5 +5.8 6.5
Sallple No. 8
Total Bytes -2.2 -3.1 -0.7
File Server -11. 5 48.4 -14.1 47.4 -10.6 48.2
Broadcasting +11.0 45.0 +12.2 45.9 +13.6 45.3
Telemetry -6.0 6.6 -5.9 6.7 -6.1 6.5
Each run in Table 10 consists of 10 replications of each
visibility period in the actual data sample. For sample no. 7
each run is ten replications of the 20 visibility periods and for
sample no. 8 each run is 10 replications of the 8 visibility
periods. The data in Table 10 shows good agreement of byte
counts in the actual and simulated data for sample no. 7 except
for file server traffic. The percentage of file server traffic
is also lower than in the actual data for sample no. 8. However,
due to the satellite software testing mentioned earlier, the
sample no. 7 data should provide a more accurate comparison.
20
SIMULATION OF ALTERNATIVE SYSTEM OPERATIONS AND CONFIGURATIONS
Since the simulator is driven by tracking data for a
specific location, it is easy to predict how much data of each
particular type--file server, broadcasting, and telemetry--it
will be possible to receive. However, the simulator is also
useful for assessing the effects of changes made to the original
design or to current operating parameters. The results of some
simulated operational changes are described in this section.
When studying the simulated operating conditions presented
in this section, the reader is reminded that they are heavily
dependent on hardware and software capabilities both at the
spacecraft and at the ground station. Furthermore, the simu­