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GPS Jamming Trials at Sennybridge, Brecon Beacons, Wales

Lydbrook, Gloucestershire, UK, 16 September 2015, Chronos Technology Ltd has successfully demonstrated GPS Jammer triggered camera technology during official GPS Jamming trials at the Sennybridge military training area in Wales during late August 2015.

GPS jamming trials at Sennybridge are managed and administered by the Defence Science and Technology Laboratory (Dstl) on behalf of the DE&S GPS Project Office and are authorised by MoD Joint Spectrum Authority. The Chronos 2015 jamming project was sponsored by civilian Government bodies interested in understanding the threat from GPS Jammers to critical infrastructure and law enforcement.  A selection of commercial off the shelf GPS jammers was used. These were modified to jam only in the permitted band and ranged from a few milliwatts up to two Watts and included Carrier Wave (CW) and swept spectrum models.

The GPS Jammer triggered camera technology known as JammerCam™ was jointly developed by the University of Bath Dept. of Electronic & Electrical Engineering and Chronos Technology Ltd. This development took place within a project called “AJR” – Automatic Jamming Recognition through Innovate UK’s “Enabling the Internet of Sensors” Feasibility Study competition

The trials allowed JammerCam™ units to be tested in an open air environment with a range of GPS jammers hidden in vehicles passing by singly and in convoys, including cars, vans and shipping containers.  The jammer triggered camera sensor technology successfully identified and photographed the jammer hosted vehicle in every test case and at all speeds and powers. In all cases the vehicle was caught in the centre of the frame so only a single picture was needed, considerably reducing the amount of bandwidth needed between the sensor and the web server.

The photo identifying the vehicle with jammer would then be sent over a mobile network to a web server where it is distributed as a hyperlink to target email addresses. The picture can then be called up as actionable intelligence within seconds of the camera catching the jammer.

Prof. Charles Curry, MD of Chronos explained – “A proof of concept system had been demonstrated at the Sennybridge GPS Jamming trials in 2014 by the University of Bath. We then had to overcome significant challenges not least of which was making the system fully automatic so that it only took a photo of the actual vehicle hosting the jammer. We know that even the low power cigarette lighter style jammers emit enough detectable jamming to create a power bubble around the vehicle that makes it very difficult to determine which vehicle in busy traffic is hosting the jammer. Our two biggest breakthroughs were identifying which vehicle in a convoy was hosting the jammer and detecting and catching a shipping container with a low power jammer inside.

Photograph released by kind permission of
Commandant Sennybridge Training Area

"JammerCam™" on display at ION GNSS+
16-17 September 2015

Innovate UK grant assistance and use of the Sennybridge jamming test facilities through Dstl has enabled Chronos to develop world leading jammer detection technology which builds on our existing hand held and 24x7 sensor technology solutions.”

Dr Robert Watson of the University of Bath said “The core of the AJR sensor is an evolved version of the localisation technology and algorithms previously developed at the University of Bath and used in the Chronos CTL3520 handheld systems. Based on previous research and the analysis of data collected at the 2014 trials we were fairly sure of the concept. However, the key challenge for the AJR project was to take the concept and develop it into a platform capable of continuous real-time operation requiring no operator interaction. The result of our joint effort is JammerCam™, a networkable system which is continuously vigilant to the threats of jamming. The combination of precision localisation, high signal sensitivity and video capture means that there is no escape.”

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