(IVAR) - Final Report - Strategic Environmental Research and ...

data that was generated by the radar), while the RDS records would contain only the scans of
data that were successfully transmitted from the radar, over the wireless LAN connection, and
over the Internet to ARTI.
We transferred the locally recorded plots and tracks data files from the remote locations to ARTI.
We also extracted the corresponding data records for each radar from the RDS and converted the
records into the plots and tracks format to facilitate comparison with the locally recorded files.
Finally, we wrote a script to extract the scan times from each of the four plots and tracks datasets
and to output each set into a text format that we then imported to a Microsoft Excel® worksheet.
We used the Excel® worksheet to compare the number of scans present in the locally archived
and RDS datasets.
Results
Table 6-30 summarizes the comparison of the scan times from the locally archived plots and
tracks data of two radars with the corresponding scan times from the same data records that had
been transmitted over a wireless network to, and stored in, a remote RDS.
Table 6-30. Calculated uptimes for two radars, based on a comparison of the scan times in the
plots and tracks records archived locally with the scan times for the same data records that were
transmitted over a wireless LAN to a remote RDS.
Number of Scans
Radar Date Data Were Recorded Archived From RDS Dropped Uptime (%)
SEAAR1m 12 May 2009 34598 34153 445 98.7
eBirdRad 26 November 2009 29091 28870 221 99.2
Based on these comparisons, the wireless LAN at SEA was available 98.7% of the time (i.e.,
1.3% of the scan times in the local SEAAR1m dataset were missing, or “dropped”, from the
same data on the remote RDS), while the wireless LAN at NASWI had 99.2% uptime.
Conclusion
We successfully demonstrated Performance Criterion SC4.1, Wireless LAN Availability: The
calculated wireless LAN uptimes at SEA and NASWI were found to be 98.7% and 99.2%,
respectively, compared to the performance metric of 50% uptime set for this criterion. This
criterion demonstrates, along with other connectivity criteria (see Sections 6.3.1.1, 6.3.1.2, and
6.3.1.6), that the ability of the avian radar systems evaluated by the IVAR project to stream data,
both locally and remotely, across both wired and wireless networks, is highly reliable under
typical operational conditions.
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