GAJT-AE-N Product SheetGAJT-AE-N
GPS Anti-Jam Technology (GAJT)
Antenna Electronics for smaller
platforms
Jamming and interference are constant threats
Jamming and interference, whether intentional or unintentional, can seriously
degrade GNSS position, navigation and timing (PNT) availability—even to the pointof total solution denial. Jammers create excessive noise, overpowering the low
power GNSS signals and saturating the electronics in a GNSS receiver front end.
Methods are needed to suppress this interference so your GNSS receiver continues
to operate.

Benefits• Commercial off-the-shelf (COTS)• Low cost anti-jam protection for smallplatforms• Easy to integrate

Battle-proven small and light enclosure
GAJT-AE-N is the antenna electronics for a Controlled Reception Pattern Antenna(CRPA) in a rugged enclosure which enables easy connectivity. GAJT-AE-N isdesigned for size and weight constrained applications such as small airborne andground unmanned platforms, where it may be preferable to mount the antenna
electronics inside the vehicle. Users can select from a variety of 4-element CRPA
antenna arrays.

• Anti-jam protection in dynamic
multi‑jammer scenarios• Compatible with legacy and modern
GNSS receivers, including M-Code• Works with most 4-element antenna
arrays (supplied separately)

How it works
GAJT-AE-N mitigates interference by creating nulls in the antenna gain patternin the direction of the jammers, providing significant anti-jam protection even in
dynamic multi-jammer environments. The output is a protected standard Radio
Frequency (RF) signal, free from jamming and suitable for input into modern andlegacy GNSS receivers.

Features• Affordable protection for GNSSposition, velocity and timing• 40 dB of interference suppression

Leading-edge technology
Interference mitigation is achieved by applying proprietary digital null forming
algorithms to the signals, creating dynamic nulls to give protection against
narrowband and broadband interference sources. The unit comprises Radio
Frequency (RF) front ends and null forming electronics. Integration to your GNSS
receiver is seamless; DC power supply and data output are made via a dedicated
LEMO® connector. We recommend CRPA antennas from Antcom Corporation for
use with the GAJT-AE-N.

• Simultaneous GPS L1/L2, QZSS L1/L2,
SBAS L1 and Galileo E1 protection• Supports M-Code on GPS L1 & L2
• Adaptive digital nulling• Built in test and jamming status
included in RS-232 outputProtects GNSS navigation and precise timing receivers
GAJT-AE-N protects GPS L1/L2, QZSS L1/L2, SBAS L1 and Galileo E1 signals. The
wide bandwidth of GAJT ensures compatibility with M-Code GPS.

GAJT-AE-N Product Sheet
Performance

Environmental

GAJT Products

GNSS Signals

MIL-STD-810G

GAJT-710 series

Center frequency
GPS L1, QZSS L1, SBAS L1 1575.42 MHz ±12 MHz
GPS L2, QZSS L2
1227.6 MHz ±12 MHz
Galileo E1
1575.42 MHz ±12 MHz

Temperature

Interference Rejection
Simultaneous L1/E1 and L2
Typical wideband suppression
40 dB
Number of simultaneous nulling directions
3Antenna Array Options
L1 and L2• 4NF-5.5CG1215P 4 element CRPA family• For additional options, please contact
NovAtelRF Ports

OperatingStorage-40°C to +71°C-55°C to +85°C

Humidity

95% non-condensing

Vibration

MIL-STD-810G(CH1), 514.7

Shock

MIL-STD-810G(CH1), 516.7

Enclosure
Immersion

MIL-STD-810G(CH1), 512.6

Blowing Rain

MIL-STD-810G(CH1), 506.6Water Jets

TimingFixed timing delay

RF inputs
RF outputs

4 x 50 ohm SMA
1 x 50 ohm SMA

Accessories

1 LEMO connector for both RS‑232 field loadingand DC power

GAJT-410ML

Canadian Controlled Goods

Power15 W+10 to +32 VDC

RF Performance• Compact enclosure system for land andfixed applications• 4-element antenna array• Direction finding and jammer status• Available in Olive Drab or Desert Tan• Also available in white (GAJT-410MS)

40 dB

4-Element Antenna Array

GAJT-AE-N (Enclosure)
Dimensions
Weight• GAJT-710MS
Warships and other marine vessels andcoastal applications

Export Approvals

Physical and Electrical

Active Gain

• GAJT-710ML
Land vehicles and fixed installations• Power and data cable, included

Power & Communication PortPower consumption
Input voltage

IEC 60529 IPX6

• Single enclosure system for land and fixedapplications• 7-element antenna array• Easy to integrate, ideal for retrofitting

179.5 × 155.5 × 39 mm
1200 g

A 4-element antenna array allows gain
pattern shapes to be changed in response tointerference. Provides 3 independent nulls.

Contact Hexagon | NovAtel
sales.nov.ap@hexagon.com 1-800-NOVATEL (U.S. and Canada) or 403-295-4900 | China: 0086-21-68882300 | Europe: 44-1993-848-736 | SE Asia and Australia: 61-400-883-601.
For the most recent details of this product: novatel.com
GAJT and NovAtel are trademarks of NovAtel, Inc., entities within the Hexagon Autonomy & Positioning division, their affiliated entities, and/or their licensors. All other trademarks are properties of theirrespective owners.
©2021 NovAtel Inc. All rights reserved. NovAtel is part of Hexagon. NovAtel makes no representation or warranty regarding the accuracy of the information in this publication. This document gives only a generaldescription of the product(s) or service(s) offered by NovAtel, and, except where expressly provided otherwise, shall not form part of any contract. Such information, the products and conditions of supply are
subject to change without notice.

D17449 Version 2 | 13 May 2021 | Printed in Canada