3.3.2 Reference Qualification and Validation
3.3.2.1 BroadShield
What is BroadShield?
BroadShield is an optional software module for VersaSync that is capable of detecting the
presence of GPS jamming or spoofing in real time.
How BroadShield Works
BroadShield monitors the GPS signal frequency band by applying proprietary error detec-
tion algorithms. If a threshold signal monitoring value level is exceeded, VersaSync will emit
a Major Alarm and – depending on your system configuration – invalidate the GPS ref-
erence causing VersaSync to either transition into Holdover mode (see"Holdover Mode"
on page193), or go out of sync.
Even if you decide to turn off VersaSync's Auto Sync Control feature, which allows
BroadShield to disable the GNSS reference, BroadShield will still add value to your overall
system capability by telling you (a) if your GNSS receiver is being spoofed, and (b) in the
event of a signal loss due to jamming,
why
the signal is lost.
Also, if a normally strong GNSSsignal becomes weakened, BroadShield's algorithms are
capable of discerning a jamming event from natural events causing the signal to weaken.
Note: For an effective jamming detection, and – to some extent – spoofing
detection, a good antenna placement with optimal sky view resulting in a
high signal-to-noise ratio is essential. A strong signal is required to discern
between normal signal fluctuations and a non-natural divergence of signal
strength.
BroadShield Requirements
In order for BroadShield to work on your VersaSync system, the following requirements
must be met:
1.
The optional BroadShield software license needs to be enabled by applying the
OPT-BSH BroadShield license key. For more information, contact your local Spec-
tracom Sales Office. To determine if BroadShield has been activated on your Ver-
saSync unit, navigate to TOOLS: SYSTEM > Upgrade/Backup. The center panel
System Configuration will list the Options installed in your unit.
Activating the BroadShield License
If you have purchased the BroadShield license key and now want to activate it, please fol-
low the instructions under "Applying a License File" on page254.
164
CHAPTER 3 • VersaSync User Manual Rev. 7.0
3.3 Managing References
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