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Advanced EHF Payloads (AEHF) - 2 / 2 Pages

Advanced EHF (AEHF), the nation's next
generation military strategic and tactical
relay system, will deliver survivable, protected
communications to U.S. forces and selected
allies worldwide. The system provides the
joint, interoperable, assured connectivity for
warfighters in operations in all levels of
conflict – a capability not available through
other planned military communication networks.
AEHF provides much greater capacity and more
flexible coverage than its predecessor, Milstar,
while assuring operational continuity through
compatibility with the Milstar constellation.
AEHF delivers the flexible connectivity-ondemand
needed to achieve 21st century
objectives – swift, decisive outcomes based
on information dominance. On-orbit processing
provides the flexibility needed to rapidly establish
and reconfigure networks to meet dynamic
command and control requirements.
Electronically steerable antenna beams and
flexible channel-to-beam mapping allows the
delivery of capacity when it's needed,
where it's needed. EHF frequencies,
onboard digital processing, and highly
directional antennas reduce the probability
of jamming and intercept, assuring secure,
reliable communications. Satellite
crosslinks enable flexible global communications
without the need for fixed site
ground gateways.
Rapidly deployable airborne, maritime, vehicular,
and manpackable AEHF terminals put this connectivity
in the hands of warfighters worldwide,
delivering communications anytime, anywhere.
©2006 Northrop Grumman Corp. • All Rights Reserved • Printed in U.S.A.
Space Technology Marketing Communications • 99K93M • 2,000 • AG • 04/06
A D V A N C E D E H F
ADVANCED EHF: Assured, Protected, Survivable Communications
The system is compatible with existing
terminals and will support future terminals
as they are deployed.
The AEHF system is integrated, tested and
launched by Lockheed Martin; Northrop
Grumman Space Technology builds and
integrates the AEHF payload – processors,
antennas, radio frequency subsystems and
crosslinks. The payload delivers the new
AEHF communication services, providing data
rates up to 8.192 Mbps per user, Milstar Low
Data Rate (LDR) services (75-2400 bits per
second), and Milstar Medium Data Rate
(MDR) services (4.8 Kbps-1.544 Mbps).
The AEHF antenna suite provides several
coverages that are tailored to meet unique
warfighting requirements. Low gain earth
coverage antennas deliver communications
anywhere within the satellite's footprint. The
phased array antenna provides super highgain
earth coverages, enabling worldwide
unscheduled access for all users, including
small portable terminals and submarines. Six
medium resolution coverage antennas (MRCA)
are provided by dwelling spot beam antennas,
and up to 24 time-shared MRCA coverages
are provided by phased array antennas. Two
high resolution coverage area antennas enable
operations in the presence of in-beam jamming.
Advanced EHF: secure command and
control for the 21st century
Frequency
Data Rates
System Security
Interoperability
Antenna Coverages
Crosslinks
EHF (44 GHz) uplink
SHF (20 GHz) downlink
75 bps - 1.544 Mbps
Terminal-to-terminal COMSEC TRANSECgoverned
frequency hopping
Milstar LDR & MDR modulation modes
1 earth coverage beam
5 agile beams
2 narrow and 1 wide spot beams
2 nulling spot beams
6 spots (distributed user coverage)
2 per satellite (each bi-directional) ~ 10 Mbps
EHF (44 GHz) uplink
SHF (20 GHz) downlink
75 bps - 8.192 Mbps
Terminal-to-terminal COMSEC TRANSECgoverned
frequency hopping
Milstar LDR, MDR & AEHF modulation modes
1 earth coverage beam
4 agile beams
24 time-shared spot beams
2 nulling spot beams
6 dwelling spot beams
2 per satellite (each bi-directional). Compatible
with Milstar & AEHF requirements ~ 60 Mbps
Milstar (LDR & MDR) Advanced EHF
High Resolution
Coverage Antenna (2)
Transmit
Phased Array
Antenna (2)
Medium Resolution
Coverage Antenna (6)
Crosslink
Antenna (2)
Receive
Phased Array
Antenna
Low Gain
Earth Coverage
Antenna

Advanced EHF Payloads (AEHF)
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    ASSURED,, PROTECTED,, SURVIIVABLE COMMUNIICATIIONSA D V A N C E D E H F
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