JED - December 2017 - 38

products generated as they approach
compression, unnecessarily increase the
ELINT system false-alarm rate (FAR). As
the emitter density in the environment
increases, the more exacerbating the interference problem.
Signal Bandwidth
The pursuit of establishing an EOB
against high-value emitters requires
that we maximize SNR and have modes
in the ELINT system that support operation as close to "Matched Receiver"
conditions as possible. One very useful

tool to achieve matched receiver conditions in the ELINT system is the use of
selectable hardware and digital filtering
to enable the operator to select a system
IBW that approaches matched conditions and high S/N.
Intrapulse
For an ELINT system to collect intrapulse, the user must consider the full
range of intrapulse data of interest and
this must then address the bandwidth
and other receiver parameters to ensure
quality ELINT data.

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ANTENNA OPTIONS
Although the discussion, so far,
has revolved around the need for large
IFOV and high accuracy DF, the MALE/
HALE platform not only makes it feasible to consider mounting a relatively
long baseline interferometer to accommodate high-accuracy DF at the lowest
frequency, it also supports other antenna options. For example, it is quite appropriate to consider the use a spinning
dish antenna that offers significant directional gain in combination with the
interferometer.
High-Accuracy DF
High-accuracy DF is achieved by
precision angle-of-arrival (AOA) measurement over a wide instantaneous
bandwidth and wide instantaneous
field of view. This is critical to rapidly
establishing changes in the EOB and to
support SEAD operations. To achieve
this, fast and accurate DF, as well as
rapid location estimates and precision AOA measurement must be made
on a pulse-to-pulse basis to support
real-time de-interleaving using AOA as
part of the emitter-sorting algorithms.
These demands drive the system solution towards the use of single- and/or
dual-axis linear phase interferometer
DF designs.
Directional Gain
Specifically recalling the sensitivity
equation from earlier in this discussion, we can see that having gain -and
specifically directional gain - from an
antenna can make a significant contribution to sensitivity and ultimately SNR
during collection. It also enables higher
SNR under non-ideal conditions, where
matched receiver conditions are not
possible due to emitter agility or occulting modes that remove the opportunity
to use appropriate signal processing
techniques for the real-time operation.
With a MALE/HALE platform, the
installation of a spinning dish antenna
is not only a beneficial option, but it is
often feasible because many of these
platforms are often modified to mount
SAR, and substitution of the SAR antenna by a spinning high-directional-gain
antenna may not represent a significant
change to the platform.
One by-product of the spinning dish
antenna and its high directional gain is

2017-10-20 12:29 AM


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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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