Anti-Jamming technology

The AJ977XF Anti-Jamming antenna is designed to mitigate interference and jamming signals broadcast from near ground-based transmitters. The radiation pattern of the Low Elevation Angle Nulling Antenna (LEANA) provides 20 dB (Typical) wideband suppression for all GNSS band signals received at an elevation angle of 0° through to approximately 15°. This level of attenuation will mitigate a 600 Watt jamming signal broadcast at an elevation angle of 10°, 100m or greater away from the AJ977XF antenna. The combination of Tallysman’s low elevation angle nulling radiation pattern, and eXtended Filtering (deep filters and high IP3 (prevents saturation in the presence of noise)) technologies provides a one-two punch to jamming and radio frequency noise. At the same time, the AJ977XF’s radiation pattern above 20° elevation angle provides excellent gain and a phase center that supports accurate and precise positioning.

Calian’s CR8894SXF+ GNSS Controlled Reception Pattern Antenna (CRPA) can mitigate/null one (1) interference or jamming signals in both the lower (1189 -1254 MHz) and upper (1559 – 1591 MHz) GNSS bands for a total of two (2) nulls.

The CR8894SXF+ is a 4-element CRPA designed for dual-band Global Navigation Satellite System (GNSS) signal reception. It supports GPS L1/L2, Galileo E1/E5b, GLONASS G2/G3, and BeiDou B1/B2b signal bands. The wide bandwidth antenna elements also support GPS M-Codes on both L1 and L2.

Calian AJ antenna can mitigate, ground or near ground based jamming signals that can saturate the antennas Low Noise Amplifier (LNA) and prevent signals from being passed to the GNSS receiver.

Given that the AJ feature, significantly reduces the tracking of low elevation satellites it is strongly recommended that users consider using antennas and receivers that support more than one constellation so that the receiver can provide continuous tracking (track more that 4 satellites).