JED - December 2017 - 37

eter array and improved immunity to
interference with a multi-channel superheterodyne digital receiver.
High Immunity to Interference
To support high immunity to interference, the ELINT system must use
multiple layers of hardware filtering
and a high-dynamic-range digital receiver. Hardware filtering is important
throughout the system architecture,
since digital filters and channelizers
are of virtually no benefit if the analogto-digital converter approaches saturation. This also implies that the digital

receiver needs to have a digitizer that
can support a high dynamic range with
a high effective number of bits (ENOB),
which should be as good or better than
its older analog equivalent, where 60 to
70 dB SFDR was not uncommon.
Filtering to improve immunity to interference in the low noise amplifiers,
necessary for ensuring good system
sensitivity through a low system NF,
is also an important consideration. In
a dense and interfering environment,
the front-end amplifiers could be driven
hard enough that the intermodulation

Reliability
isn't an
option - it's a
requirement.

The Journal of Electronic Defense | December 2017

The concern about the extremes of
frequency coverage, which are the VHF
and millimeter wave (mmwave) emitter
band respectively can be thought of as
exceptions. In looking at the A2AD bubble in terms of the high-value emitters,
it can be argued that the VHF band is
more important than the mmwave, yet
VHF is often not covered by traditional
ELINT systems. For the mmwave band,
the problem is that these signals are
subjected to the propagation losses due
to atmospheric and weather conditions.
These conditions are such that under
a range of aspect angles and rain rates
for example, the propagation losses can
amount to 10s of dBs variation, and this
is why mmwave is associated with relatively short-range operation and weapons systems or the terminal phase of a
long-range missile.
In addressing coverage at the extremes, any ELINT system architecture
can be evolved to take these into account. The issue is that there is a cost
to adding both of these extremes. In a
trade-off where you can only afford one,
which would be the better option? In
this regard, one might think about the
exploitation of a COMINT system that
may be onboard the platform. In this
case, it may be that the hardware can
be replicated or adopted at some level
in the architecture to satisfy the ELINT
feed without compromising the operational needs of the COMINT mission.
High POI and Immunity -
Hybrid Receiver Architecture
To address the divergent needs of high
POI and immunity, the user can decide on
a hybrid receiver architecture using the
strengths of one receiver to complement
the weaknesses of the other and vice versa. A combination of receiver technologies, such that one receiver is acting as a
traditional ESM system, where precision,
accuracy and immunity are traded for
POI approaching 100% spatially, spectrally and temporally. This type of receiver
might consist of an amplitude comparison monopulse DF or omni antenna combined with an instantaneous frequency
measurement receiver.
The other major element of the hybrid receiver architecture would address
the considerations of high accuracy DF
through the use of a linear interferom-

37

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2017-10-12 12:01 PM


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JED - December 2017

Table of Contents for the Digital Edition of JED - December 2017

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
An Approach to UAV-Based ELINT
Combined EW and Cyber Event Illuminates Important Issues and Disconnects
Technology Survey: RF Tuners and Tuner Modules for SIGINT Applications
AOC EW Singapore 2018 Preview
Report from the 2017 AOC CEMA Conference
New Products
Recounting the History of the EW Working Group
EW 101
AOC 2017 Annual Award Winners
AOC News
Index of Advertisers
JED Quick Look
JED - December 2017 - intro
JED - December 2017 - cover1
JED - December 2017 - cover2
JED - December 2017 - 3
JED - December 2017 - 4
JED - December 2017 - 5
JED - December 2017 - The View From Here
JED - December 2017 - 7
JED - December 2017 - Conferences Calendar
JED - December 2017 - 9
JED - December 2017 - Courses Calendar
JED - December 2017 - 11
JED - December 2017 - From the President
JED - December 2017 - 13
JED - December 2017 - 14
JED - December 2017 - insert1
JED - December 2017 - insert2
JED - December 2017 - The Monitor
JED - December 2017 - 16
JED - December 2017 - 17
JED - December 2017 - 18
JED - December 2017 - 19
JED - December 2017 - 20
JED - December 2017 - 21
JED - December 2017 - 22
JED - December 2017 - 23
JED - December 2017 - Washington Report
JED - December 2017 - 25
JED - December 2017 - World Report
JED - December 2017 - 27
JED - December 2017 - An Approach to UAV-Based ELINT
JED - December 2017 - 29
JED - December 2017 - 30
JED - December 2017 - 31
JED - December 2017 - 32
JED - December 2017 - 33
JED - December 2017 - 34
JED - December 2017 - 35
JED - December 2017 - 36
JED - December 2017 - 37
JED - December 2017 - 38
JED - December 2017 - 39
JED - December 2017 - 40
JED - December 2017 - Combined EW and Cyber Event Illuminates Important Issues and Disconnects
JED - December 2017 - 42
JED - December 2017 - 43
JED - December 2017 - 44
JED - December 2017 - 45
JED - December 2017 - 46
JED - December 2017 - 47
JED - December 2017 - 48
JED - December 2017 - Technology Survey: RF Tuners and Tuner Modules for SIGINT Applications
JED - December 2017 - insert3
JED - December 2017 - insert4
JED - December 2017 - 50
JED - December 2017 - 51
JED - December 2017 - 52
JED - December 2017 - 53
JED - December 2017 - 54
JED - December 2017 - 55
JED - December 2017 - 56
JED - December 2017 - 57
JED - December 2017 - 58
JED - December 2017 - 59
JED - December 2017 - 60
JED - December 2017 - 61
JED - December 2017 - 62
JED - December 2017 - AOC EW Singapore 2018 Preview
JED - December 2017 - 64
JED - December 2017 - 65
JED - December 2017 - 66
JED - December 2017 - 67
JED - December 2017 - Report from the 2017 AOC CEMA Conference
JED - December 2017 - 69
JED - December 2017 - 70
JED - December 2017 - 71
JED - December 2017 - 72
JED - December 2017 - 73
JED - December 2017 - New Products
JED - December 2017 - 75
JED - December 2017 - 76
JED - December 2017 - Recounting the History of the EW Working Group
JED - December 2017 - 78
JED - December 2017 - 79
JED - December 2017 - 80
JED - December 2017 - EW 101
JED - December 2017 - 82
JED - December 2017 - 83
JED - December 2017 - 84
JED - December 2017 - AOC 2017 Annual Award Winners
JED - December 2017 - 86
JED - December 2017 - 87
JED - December 2017 - 88
JED - December 2017 - 89
JED - December 2017 - 90
JED - December 2017 - 91
JED - December 2017 - 92
JED - December 2017 - 93
JED - December 2017 - 94
JED - December 2017 - AOC News
JED - December 2017 - 96
JED - December 2017 - Index of Advertisers
JED - December 2017 - JED Quick Look
JED - December 2017 - cover3
JED - December 2017 - cover4
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