Nissan called it the gps jammer, and demonstrated the concept on its small crossover vehicle, Juke. The compartment is in the arm of the car, surrounded by a Faraday shield that blocks all mobile phones, bluetooth and wi-fi signals. If the driver puts his cell phone in a cubicle, the device will be completely disconnected and silent, eliminating the possibility of distraction.
Of course, in order to achieve the same effect, the driver can also turn off the phone and put it aside. But nissan said the “signal shield” was designed to provide drivers with a choice when driving, rather than turning off their phones.
Generally, an antenna array for interference suppression is a spatial filter. It is a signal- processing method which makes use of the spatial selectivity of antenna array to filter out the jammers and to improve the SNR. The anti-jamming algorithms based on antenna array are divided into two categories according to their goals. One is the Digital Beam Forming (DBF), which adjusts the main beam automatically to the desired signals. The other is the Adaptive Nulling algorithm], which points the nulls to jammers. The DBF requires the direction information of GNSS signals and its computation is quite complex. As a result, its jamming mitigation performance will degrade severely if errors of the estimation on GNSS signals’ direction increase.
Ships use GPS (Global Positioning System) and similar devices that rely on sending and receiving satellite signals, which are vulnerable to wifi jammers device by hackers.Last year, South Korea said hundreds of fishing vessels had returned early to port after their GPS signals were jammed by hackers from North Korea, which denied responsibility.
The former captain said he’d like to see inmates locked down all of the time, but he said he realizes that might not be feasible. The Federal Communications Commission won’t currently allow for signal jamming, so, Johnson is advocating for prisons to use special technology that contains wireless signals coming from the prisons. “It offers an alternative to signal jamming that the prisons can afford and it’s proven to stop cellphones,” he said.