Instant anti-jam protection

The compact, efficient design of the GAJT antenna makes the addition of anti-jam capability to existing and new vehicles easy. GAJT is externally mounted, requiring no additional electronics inside the vehicle—only power and a single RF cable.

Vehicle with typical GPS system

GAJT requires only power and
existing antenna cable

With minimal vehicle alterations required, operator training is unnecessary because the original GPS unit remains in place.

The self-enclosed GAJT provides an all-in-one solution unlike other anti-jam devices that typically feature more than one component. This results in faster installation, minimizes vehicle downtime and installation training, and makes it easy to integrate or retrofit into existing and legacy fleets.

Big impact in a small package

GAJT is an active antenna based on a 7-element controlled reception pattern antenna and null-forming algorithm. The antenna adapts the reception pattern to reduce the gain in the direction of malicious and accidental jammers. Incorporating NovAtel’s patented 7-element Pinwheel™ antenna, seven independent copies of the GPS L1 and L2 frequencies are acquired from seven different locations within GAJT’s radome. These are then down-converted to intermediate frequency for high-speed digital sampling and processing by QinetiQ’s proprietary null-forming algorithm. This optimizes the power and phasing of the seven independent signals to create a single, high quality output signal. The output is then up-converted to the original GPS frequencies. The clean output signal is delivered through a standard TNC connection, via coaxial cable, to the antenna input port on new or legacy GPS receivers.