Soar says Chronos Technology installed and operated the GAJT without the need for any support. The GAJT was mounted on the roof in place of the existing standard antenna and provided with a DC power connection. When it was attached to the timing server’s GPS receiver via the existing RF cable, it started to provide protection immediately.

“GAJT was designed for armoured vehicles but it clearly works well for timing server installations as well,” Soar stated.
“GAJT worked, and it worked well. The interference stopped. We simply fitted the antenna, and it worked perfectly,” Curry says.

“While we have focused mainly on serving defence and military customers,” says Soar, “GAJT is also applicable to any GPS installation, as Chronos Technology has demonstrated. The security services and critical infrastructure such as cell phone networks and financial systems are all in need of protection from jamming.”

“The biggest user of GPS-based timing and sync today is telecoms,” Curry says, “especially CDMA mobile networks which are not generally deployed in the UK and EU. GPS-based timing could become more popular over the next couple of years as new services are launched to manage the demand for more bandwidth.

So, while Chronos, with the SENTINEL project, had initially set out to look for instances of jamming, it also provided a good demonstration of a promising interference mitigation solution, allowing us all to be more confident that those increasingly present jammers and other sources of interference will not ultimately negate the wide-ranging benefits of GNSS technology.