Defense GAJT-710MS

™

SINGLE-ENCLOSURE GPS ANTI-JAM

TECHNOLOGY (GAJT

) FOR MARINE

APPLICATIONS

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.

LOW COST, SMALL FORM FACTOR

Until now, the high cost and large size of Controlled Reception Pattern Antennas

(CRPAs) has limited their use to the largest capital ships while other vessels in the

ﬂeet were le vulnerable to GPS interference. The GAJT-710MS CRPA from NovAtel

combines an antenna array and null forming electronics into a marine hardened

enclosure that is suitable for installation on a wide range of marine vessels, from small

patrol boats to large carriers.

LEADING EDGE TECHNOLOGY

The system uses NovAtel’s Pinwheel® antenna array to receive GNSS signals in the

L1 and L2 bands. Interference mitigation is achieved by applying proprietary digital

beamforming algorithms to the signals, creating dynamic nulls to give protection

against narrowband and broadband interference sources. Integration to your GPS

receiver is seamless.

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-710MS is a standard Radio

Frequency (RF) feed, suitable for input to legacy GPS receivers.

BUILT FOR THE FUTURE

GAJT protects L1 and L2 GPS signals. The wide bandwidth of the GAJT-710MS

ensures future compatibility with M-Code GPS.

Low cost anti-jam protection for

ships and boats

Easy to integrate, ideal for

retroﬁtting

Anti-jam protection in dynamic

multi-jammer scenarios

Compatible with legacy

GPS receivers

FEATURES

Aordable protection for GPS

position, velocity and time

Up to 40 dB of additional

anti-jamming protection

Single enclosure system

Simultaneous GPS L1 and L2

protection

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

Controlled Reception Pattern

Antenna (CRPA)

Number of elements 7

Bandwidth ±11 MHz (centered on L1 and L2)

Noise ﬁgure 3 dB

LNA gain 30 dB

VSWR ≤2.0:1

RF output 50 Ω TNC

INTERFERENCE REJECTION

Simultaneous L1 and L2

Interference suppression 40 dB (typical)

Number of simultaneous nulling directions 6

PHYSICAL AND ELECTRICAL

Dimensions 290 × 290 × 120 mm

Weight 7.5 kg

Power

Power consumption 25 W

Input voltage +10 to +28 VDC

ENVIRONMENTAL (target)

MIL-STD-810G

Temperature

MIL-STD-810G 505.5

Operating -40°C to +71°C

Storage -55°C to +85°C

Humidity

MIL-STD-810G 507.5, Proc. II

Altitude

MIL-STD-810G 500.5

Operating 3,600 m/12,000’

Storage 12,000 m/40,000’

Solar Radiation

MIL-STD-810G 505.5

Corrosion

MIL-STD-810G, 509.5

MIL-STD-810G

Water

MIL-STD-810G, 512.5

IEC 60529 IPX6

Sand and Dust

MIL-STD-810G, 510.5

Salt Fog

TBD

Submersion

IP67

Vibration

MIL-STD-810G, 514.6

Shock

MIL-STD-810G, 516.6

Compliance

CE, FCC, WEEE

Connectors

Power MIL-C-26482, Series 2

RF TNC (Female)

Service MIL-DTL-38999, Series 3

ACCESSORIES

• 5 m unterminated GAJT vehicle

power 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-AE-N

• Suitable for smaller platforms

including UAVs

• Antenna electronics for 4-element

antenna arrays

• Works with most 4-element antenna

arrays (supplied separately)

7-element Pinwheel Antenna Array

The 7-element Pinwheel antenna array

allows gain pattern shapes to be changed

in response to interference. Provides 6

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 0C

Speciﬁcations subject to change without notice.

NovAtel, GAJT and Pinwheel are registered trademarks of NovAtel

Inc.

D20207 October 2016

Printed in Canada.

GAJT-710MS

™