telemetry
CH10 and broadcast on the network, the
data is now aggregated into one single
stream by the NetView Data Host. Acting
as a central point for all data, the Data Host
time aligns the streams for recording and
distribution. Considering the large amount
of data and very long test duration (months
or years), the Data Host is connected to a
dedicated Network Attached Storage (NAS)
where continuous time history and “single
scan” data recording is stored. The
architecture adds redundancy to the
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AEROSPACETESTINGINTERNATIONAL.COM // SHOWCASE 2020 41
to convert one or many proprietary
streams into CH10. The Telemetry
attributes Transfer Standard (TMATS) is
used to transfer each and every channel’s
specific information from each and every
system. This contains the EU conversion,
upper/lower warning/alarm levels, channel
names/descriptions, which is also
broadcast on the network, as well as
recorded as part of the file in .ch10 format.
With the proprietary data formats from
each system time stamped, converted to
data is time stamped, it is important to
control the distribution and end-to-end
latency of data over the test network.
The network architecture must be
consistent with the scale of the testing. In
Telspan’s recent implementation, a
combined 25,000+ channels of
measurement are coming from the DAS,
LCS, FOS & DIC. With the addition of
Flight Test Instrumentation (FTI) hardware
and avionics data buses, the combined
count can easily exceed 30,000 channels.
Utilizing 1G, 10G and 25G networks
ensures data gets where and when its
intended.
Traditionally, hardware used in ground
test facilities outputs a proprietary data
stream and not CH10 natively. Derived
from an airborne product, the iGU
(instrumentation Gateway Unit), Telspan
Data provided the gNGU (ground Network
Gateway Unit) as a configurable “gateway”
between the proprietary data streams and
the CH10 data processing capabilities of
NetView. Telspan wrote special CH10 data
converters for the Moog LCS, Sensuron
FOS and Correlated Systems DIC and used
a gNGU for the data conversion. In the case
of the Pacific Instruments DAS, Telspan
developed a Dynamic-link library (DLL)
which provides a native CH10 output from
that system. The gNGU can be configured
“Data Fusion integrates many data sources
to produce more consistent, accurate, and
useful information than that provided by
any individual data source”
2// Telspan Data
has assisted in the design
and implementation of
a large-scale structural test
system using its NetView
Data Fusion and Display
software
3 // The ground Network
Gateway Unit is a gateway
between the proprietary
data streams and the CH10
data processing
capabilities of NetView
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