JED - December 2017 - 36

the effect of SNR to PRI measurement
accuracy.
Matched Receiver
As we have seen, measurement accuracy is dominated by SNR. In order to
maximize signal to noise, it is important to operate the ELINT as close to
a "matched receiver" as possible. Also,
referred to as matched filter, this is
the appropriately shaped linear filter
for maximizing the SNR and is a common design approach in radar. In older
conventional radar systems, "matched
receiver" is when the intermediate frequency (IF) bandwidth approaches the
reciprocal of the pulse width. In practical implementations, SNR tended to 1 dB
worse than the true matched filter.
For the ELINT receiver, where high
SNR is very desirable, matching the receiver to the signal is an important consideration. Modern radars, however, use
pulse compression techniques, so the
user must not only consider pulse width,
but rather the receiver needs to match to
the Time-Bandwidth Product. For example, the user should consider carrier fre-

Fig. 4: Nominal ELINT frequency coverage.

quency deviation range for radars with
Chirp, if they want to look at high quality
collection/recording of intrapulse. Note
also that for DF and other considerations
the filters selected should have flat pass
band group delay characteristics.
Environmental
The ELINT system that will be installed on a UAV will be subjected to
very much that same set of conditions
as those of a manned platform and will
not be discussed in detail here. Suffice
to say that the antenna array installation and environment performance are
likely to be the most challenging.

ADDRESSING THE CONSIDERATIONS
From the foregoing discussion on the
considerations the ELINT system must
address, we can then discuss how the
user in the design of the ELINT system
might address these considerations.
Threat Coverage
The actual frequency coverage of the
system will be driven by the threat, the
CONOPS and the mission imperatives,
as well as by the adopted doctrine. The
highest value emitters in the A2AD bubble will mainly be covered by a 0.5 to
18.0 GHz system for a stand-off mission,
as shown in Figure 4.

The Journal of Electronic Defense | December 2017

36

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for surface and subsurface platforms

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2017 11_JED_Coastal Surveillance_201710111.indd 1

11.10.2017 14:52:59

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2017-10-12 12:12 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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