JED - May 2014 - 52

MG) radar, jamming effectiveness begins
to decrease from an offensive jammer.
We must not make the assumption that the only assets that should
conduct offensive EA are assets supporting a strike package. That is merely
the current construct. Given Moore's
Law, we should question why offensive
EA is not part of the arsenal of air-toair escort and strike aircraft. (More on
this below.)
The downward black arrow turns from
a solid line to a dashed line to highlight
the diminishing effectiveness of offensive jammers as they attack later in the
threat kill chain. There are three primary reasons for diminishing offensive
EA effectiveness. First, the threat kill
chain is nearing completion, and once
a SAM operator with a firing button has
the required situational awareness (SA),
there is not much that can stop the button from being pressed. More simply, the
later it is in the kill chain, the harder it
is to sever the threat's targeting process.
Second, burn-through becomes more
significant the closer our aircraft get
to the jammed radar. That is, when the

reflected energy return off the skin
of a Blue aircraft is greater in relative
power intensity than the energy from
the jammer, the threat radar will be able
to discern the actual aircraft from jamming interference. This is a factor for
jamming that is attempting to raise the
ambient noise threshold of the victim
receiver (threat radar), not for deceptive
jamming that introduces false targets
into the victim receiver in an effort to
prevent real target identification from
false targets - so long as those false targets appear credible and convincing.
The third reason for diminishing offensive jammer effectiveness is alignment of the offensive jammer through
the supported/protected aircraft to
the victim receiver. As alignment deteriorates, offensive jamming effectiveness reduces. This applies to stand-off/
modified escort offensive jammers using
noise as well as sophisticated deceptive
techniques like Digital Radio Frequency
Memory (DRFM), except that DRFM does
not require alignment through the protected aircraft, only line-of-sight to the
victim radar. DRFM jamming involves

receiving and retransmitting threat
signals back to the victim radar with
a power modulation to deceive radar
cross section, frequency shift to deceive
velocity, and a time delay to deceive
range. While DRFM alignment is not as
critical as noise jamming alignment -
since the DRFM jammer is introducing
false returns to hide an actual return -
the victim radar's antenna still needs to
be pointed in the direction of the DRFM
source (or vice versa). That is, if the victim radar does not detect energy from
the DRFM jammer, there will be no false
targets processed by the victim radar's
receiver, defeating the purpose of the
DRFM jammer. Burn-through and alignment limitations are indicated by the
dashed blue container spanning TA/BM
to TI/MG.

ANTI-RADIATION MISSILES
In addition to non-lethal EA, lethal
EA is critical to suppressing an IADS.
Lethal EA (i.e., anti-radiation missiles
or ARMs) must be integrated with nonlethal EA to achieve greater effectiveness in suppressing an IADS than either

The Journal of Electronic Defense | May 2014

52

ARIS
Remote Operable ELINT System

* Real-time interception,
recording and analysis of
most modern radar signals
* Centralized operation
* Unbeaten performance and
accuracy in spectrum
surveillance and pulse
processing
* All-inclusive ELINT system
payload for air, sea and
ground based sensor
platforms

www.patria.fi
info@patria.fi

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http://www.patria.fi http://www.patria.fi

JED - May 2014

Table of Contents for the Digital Edition of JED - May 2014

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
Interview
European Helicopter EW
Advanced ASE And ESM Already On Some US Helicopters
Ground-Based COMINT Solutions
Fighting the Kill Chain: Concepts and Methods of Electronic Attack
EW 101
AOC News
Index of Advertisers
JED Quick Look
JED - May 2014 - cover1
JED - May 2014 - cover2
JED - May 2014 - 3
JED - May 2014 - 4
JED - May 2014 - 5
JED - May 2014 - The View From Here
JED - May 2014 - 7
JED - May 2014 - Conferences Calendar
JED - May 2014 - 9
JED - May 2014 - Courses Calendar
JED - May 2014 - 11
JED - May 2014 - From the President
JED - May 2014 - 13
JED - May 2014 - 14
JED - May 2014 - The Monitor
JED - May 2014 - 16
JED - May 2014 - 17
JED - May 2014 - 18
JED - May 2014 - 19
JED - May 2014 - 20
JED - May 2014 - 21
JED - May 2014 - Washington Report
JED - May 2014 - 23
JED - May 2014 - World Report
JED - May 2014 - Interview
JED - May 2014 - 26
JED - May 2014 - 27
JED - May 2014 - European Helicopter EW
JED - May 2014 - 29
JED - May 2014 - 30
JED - May 2014 - 31
JED - May 2014 - 32
JED - May 2014 - 33
JED - May 2014 - 34
JED - May 2014 - 35
JED - May 2014 - 36
JED - May 2014 - 37
JED - May 2014 - 38
JED - May 2014 - Advanced ASE And ESM Already On Some US Helicopters
JED - May 2014 - 40
JED - May 2014 - 41
JED - May 2014 - 42
JED - May 2014 - 43
JED - May 2014 - Ground-Based COMINT Solutions
JED - May 2014 - 45
JED - May 2014 - 46
JED - May 2014 - 47
JED - May 2014 - 48
JED - May 2014 - 49
JED - May 2014 - Fighting the Kill Chain: Concepts and Methods of Electronic Attack
JED - May 2014 - 51
JED - May 2014 - 52
JED - May 2014 - 53
JED - May 2014 - 54
JED - May 2014 - 55
JED - May 2014 - 56
JED - May 2014 - 57
JED - May 2014 - 58
JED - May 2014 - 59
JED - May 2014 - EW 101
JED - May 2014 - 61
JED - May 2014 - AOC News
JED - May 2014 - 63
JED - May 2014 - 64
JED - May 2014 - Index of Advertisers
JED - May 2014 - JED Quick Look
JED - May 2014 - cover3
JED - May 2014 - cover4
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