Defense GAJT-AE-N
™
GPS ANTI-JAM TECHNOLOGY
(GAJT®) ANTENNA ELECTRONICS
FOR SMALLER PLATFORMS
JAMMING AND INTERFERENCE ARE HERE TO STAY
Jamming and interference, whether intentional or unintentional, can seriously degrade
GPS position, navigation and time availability—even to the point of total solution
denial. Jammers create excessive noise, overpowering the low power GPS signals
and saturating the electronics in a GPS receiver front end. Methods are needed to
suppress this interference so your GPS receiver continues to operate.
SMALL AND LIGHT ENCLOSURE
The GAJT-AE-N provides the antenna electronics for a Controlled Reception Pattern
Antenna (CRPA) in a rugged enclosure.
WHO IS IT FOR?
GAJT-AE-N is designed for size and weight constrained applications such as small
airborne and ground unmanned platforms, where it is preferable to mount the
antenna electronics inside the vehicle. Users can select from a variety of 4-element
antenna array and cabling lengths to best meet the form factor requirements of their
installation.
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. DC power is supplied via a dedicated
LEMO
®
connector. Integration to your GPS receiver is seamless. Any 4-element CRPA
can be used. We recommend antennas from Antcom Inc., either from their standard
range or designed for custom form-factors.
HOW IT WORKS
GAJT mitigates interference by creating nulls in the antenna gain pattern in the
direction of jammers, providing significant anti-jam protection even in dynamic
multi-jammer scenarios. The output of the GAJT-AE-N is a standard Radio Freqency
(RF) feed, suitable for input to legacy GPS receivers.
BUILT FOR THE FUTURE
The wide bandwidth ensures future compatibility with M-Code GPS.
+
Low cost anti-jam protection for
small platforms
+
Easy to integrate
+
Anti-jam protection in dynamic
multi-jammer scenarios
+
Compatible with legacy
GPS receivers
+
Works with most 4-element
antenna arrays
(supplied separately)
FEATURES
+
Aordable protection for GPS
position, velocity and time
+
Up to 40 dB of additional
anti-jamming protection
+
Simultaneous L1 and L2
+
Adaptive digital nulling
For more information about GAJT, visit
www.gnss.ca or email
info@gnss.ca
BENEFITS
PERFORMANCE
GNSS (GPS) Signals
Center frequency
L1 1575.42 MHz
L2 1227.6 MHz
INTERFERENCE REJECTION
Simultaneous L1 and L2
Typical wideband suppression 40 dB
Number of simultaneous nulling directions 3
ANTENNA ARRAY OPTIONS
L1 and L2
» 4 element Antcom 3.5 inch
» 4 element Antcom 4.25 inch
» 4 element Antcom 5 inch
RF PORTS
RF inputs 4 x 50 ohm SMA
RF outputs 1 x 50 ohm SMA
POWER & COMMUNICATION PORTS
1 LEMO connector for both RS-232 field
loading and DC power
PHYSICAL AND ELECTRICAL
Power
Power consumption 15 W
Input voltage +10 to +28 VDC
GAJT-AE-N (Enclosure)
Dimensions 179.5 × 155.5 × 39 mm
Weight 120 0 g
GAJT-AE (Card level)
Dimensions 150 x 120 x 35 mm
Weight 700 g
ENVIRONMENTAL (targets)
MIL-STD-810G
Temperature
Operating -40°C to +71°C
Storage -55°C to +85°C
Humidity 95% non-condensing
Vibration MIL-S T D -202G
ASAE EP455
Shock MIL-STD-810G(CH1), 516.7
Enclosure
Immersion MIL-STD-810G(CH1), 512.6
Blowing Rain MIL-STD-810G(CH1), 506.6
Water Jets IEC 60529 IPX6
ACCESSORIES
• Power and data cable
EXPORT APPROVALS
Canadian Controlled Goods
OTHER GAJTS
GAJT-710ML
• Single enclosure system for land and fixed
applications
• 7-element antenna array
• Easy to integrate, ideal for retrofitting
GAJT-710MS
• Single enclosure system for warships
and other marine vessels
• 7-element antenna array
• Easy to integrate, ideal for retrofitting
4-ELEMENT ANTENNA ARRAY
A 4-element antenna array allows gain
pattern shapes to be changed in response
to interference. Provides 3 independent
nulls.
For more information about GAJT, visit
www.gnss.ca or email
info@gnss.ca
gnss.ca
sales@gnss.ca
1-855-OEM-GNSS (U.S. and Canada)
or 778-430-5999
Europe 1-855-636-4677
SE Asia and Australia 1-855-636-46771
Version 0N
Specifications subject to change without notice.
©2015 NovAtel Inc. All rights reserved.
NovAtel and GAJT are registered trademarks of NovAtel Inc.
D17449 December 2016
Printed in Canada.
GAJT-AE-N
™
