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4.-AESA-radars-using-Dual-axis-Multibeam-Scanning

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INFORMATION WHICH SHALL NOT BE USED, REPRODUCED OR DISCLOSED TO THIRD PARTIES WITHOUT PRIOR
WRITTEN AUTHORIZATION BY THALES NEDERLAND B.V. AND/OR ITS SUPPLIERS, AS APPLICABLE.
www.thalesgroup.com
AESA radars using Dual-axis
Multibeam Scanning
Saudi Symposium for RADAR Technology,
December 10th 2014
Nico de Bruijn
Thales Netherlands B.V.
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Thales AESA Radars Overview
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Operational
Use
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Functionality
Multi-mission Sensor
Technical
innovation
Dual Axis Multibeam
Forward-backward scanning
Active tracking
AESA and
Digital beamforming per element
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Operational Use
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Wider spectrum of targets - Challenges for radar design
Conflicting requirements to be solved
in single radar mode
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Operational Use
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From challenges to radar design (naval domain)
Slow targets

Small &

Slow
Conventional targets
Challenge: to find small
targets in clutter
Doppler processing is used to separate targets from
clutter
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Functionality
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Scanning strategy
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Slow targets
…
Conventional targets
LRS MRS
LRS
burst
MRS
…
𝑉𝑏𝑙𝑖𝑛𝑑 =
∙𝑃𝑅𝐹
Interleaved waveforms optimised per velocity domain

LRS: long range, high velocity, high PRF

MRS: short/medium range, low velocity, low PRF (high PRT!)
Longer dwell time required!
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2
Functionality
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Dual-axis multibeam
Single-axis multibeam
(e.g. SMART-S)
Elevation
Dual-axis multibeam
(new generation)
Variety of
configurations
Transmit
beam
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Simultaneous
receive beams
Ground-range
Simultaneous receive beams in
elevation
Simultaneous receive beams in
azimuth & elevation
Dual-axis multibeam:

Increase of dwell time for same scan rate

Increase in azimuth accuracy (monopulse-like measurement)
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Functionality
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Dual axis multi-beam
Benefits:


Solves conflicting requirements in one mode:

Long observation time for slow targets in clutter environment

High update rate for fast and high manoeuvring targets
High accuracy & improved resolution in azimuth/elevation
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Functionality
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Specific techniques used as applicable
Forward / backward scanning
allowing Active tracking:
 Fast track initiation
 High track accuracy
 Track continuity outside the search
coverage areas
Forward/Backward scanning allowing
more scan speeds with same antenna
rotation rate:


Long range
Medium range
=> slow scan speed
=> high scan speed
Implementation depends on product requirements
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Technology
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AESA with full controlled array – why?
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Beam offset
DBF per element
Enables broad beam patterns for
Dual Axis Multibeam
Low sidelobes during offboresight scanning (e.g. for
active tracking)
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Thales AESA philosophy
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How it all is connected…
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AESA array with
full control over all
elements
Dual-axis
multibeam
Wide coverage
beams
“True AESA”
…
Detect a wider spectrum
of targets in clutter
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…
Interleaf different
waveforms
Thales long history in naval AESA radars
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APAR
SM400
SMART-L EWC
(X-band)
(S-band)
(L-band)
NS100
(S-band)
First contract
1997
2007
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2012
2013
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Dutch OPV - SEA MASTER 400
SEA MASTER 400
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Operational Feedback Dutch OPV
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
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
Anti-drugs operation Caribbean

Anti-drugs: Zr Ms Holland caught ~10% of total maritime drug traffic of the
whole year in the Caribbean, according to US Coast Guard.

Spotted 6 small airplanes smuggling drugs (never seen before – performed
thanks to the SM400 radar)

Performed multiple SAR cases and Coast Guard tasks (law enforcement)
UAV operations

Zr Ms Holland worked with MALE UAV - Guardian (Predator B) system
operated by U.S. Coast Guard.

SM400 radar and Non-Rotating IFF performance was such, that U.S.
officers decided that Zr Ms Holland could operate as a stand-alone unit in
cooperation with Guardian UAVs.

First time that a non-U.S. ship was allowed to take on this role.

OPV joining “Joint Warrior” exercises near Scotland “spoiled” enemy
manoeuvres as sensors revealed all threats.
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NS100
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In Development & Production
NS100
High elevation search
Low elevation search
(Surface & Air)
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+ 1 beam for SLB
Surveillance
mode
Air
surveillance
Active tracks
Surface gun
fire control
Update
rate
4s
Slow target search
(Surface & Air)
+ 1 beam for SLB
≤2 s
Display video/
2s
FC surface surveillance
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SMART-L EWC
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Expand into fast domain (BMD) (in production)
Point
Defence
SMART-L EWC
Early
warning
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2000 km mode
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Conclusion
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Dual axis multi-beam: Next generation surveillance radars


Generate razorsharp radar image

Expand velocity domain of targets
Different band radars in development & production
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
AESA is not a goal in itself but a means to an end
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