JED - May 2013 - 58

E W101
the target. By sensing the rate of change of aspect
angle, the missile tracker can detect the presence
Tracking Window
of a flare and stop its tracking until the flare has
left the tracking window. Note that the angular
separation will be seen as much smaller during an
attack from the front or rear of the target aircraft,
so this defense will be much less effective.
Reduced energy
from flare
Also in an abeam attack, the missile seeker
will see two targets because a flare decelerates
relative to the launching aircraft as shown in
Figure 4. In this case, if the tracker focuses on
the leading target, it will discriminate against
the flare.
Since a launched flare will fall below the
Filter over lower half
launching aircraft, as shown in Figure 5, the
of tracking window
tracker can place a filter over the lower part of
the tracking window or in the lower rear quadrant if tracking from abeam. This will reduce energy received from the flare and thus allow the
Figure 5: A filter over the lower half of the tracking window will cause the tracker to
lock onto the target because the energy from the flare is reduced.
tracker to see the intended target as the more
attractive target.
Note that these geometric defenses are defeatflare countermeasure could be overcome by activating flares in
ed if the flare has forward thrust or lift.
of a missile attack (i.e., pre-emptive deployment)
anticipation
rather than in response to a detected missile approach.

What‘s Next
Geometric Defenses
If a missile is attacking an aircraft from abeam, the rate of
change of angle to the flare will be much greater than that of

Next month, we will discuss the operational safety aspects
of IR countermeasures. For your comments and suggestions,
Dave Adamy can be reached at dave@lynxpub.com. a

The Journal of Electronic Defense | May 2013

58

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JED - May 2013

Table of Contents for the Digital Edition of JED - May 2013

The View From Here
Conferences Calendar
Courses Calendar
From the President
Letters
The Monitor
The Monitor
The Long Hard Road – EW’s Future in Europe
Technology Survey: Signal Generators
Two Domains Are Better Than One
Preview: AOC 50th Anniversary
EW 101
Book Review
AOC News
Index of Advertisers
JED Quick Look
JED - May 2013 - cover1
JED - May 2013 - cover2
JED - May 2013 - 3
JED - May 2013 - 4
JED - May 2013 - 5
JED - May 2013 - The View From Here
JED - May 2013 - 7
JED - May 2013 - Conferences Calendar
JED - May 2013 - 9
JED - May 2013 - Courses Calendar
JED - May 2013 - 11
JED - May 2013 - From the President
JED - May 2013 - 13
JED - May 2013 - Letters
JED - May 2013 - The Monitor
JED - May 2013 - 16
JED - May 2013 - 17
JED - May 2013 - 18
JED - May 2013 - 19
JED - May 2013 - 20
JED - May 2013 - 21
JED - May 2013 - 22
JED - May 2013 - 23
JED - May 2013 - 24
JED - May 2013 - 25
JED - May 2013 - The Monitor
JED - May 2013 - 27
JED - May 2013 - The Long Hard Road – EW’s Future in Europe
JED - May 2013 - 29
JED - May 2013 - 30
JED - May 2013 - 31
JED - May 2013 - 32
JED - May 2013 - 33
JED - May 2013 - 34
JED - May 2013 - 35
JED - May 2013 - 36
JED - May 2013 - 37
JED - May 2013 - 38
JED - May 2013 - 39
JED - May 2013 - 40
JED - May 2013 - Technology Survey: Signal Generators
JED - May 2013 - 42
JED - May 2013 - 43
JED - May 2013 - 44
JED - May 2013 - 45
JED - May 2013 - 46
JED - May 2013 - 47
JED - May 2013 - Two Domains Are Better Than One
JED - May 2013 - 49
JED - May 2013 - 50
JED - May 2013 - 51
JED - May 2013 - Preview: AOC 50th Anniversary
JED - May 2013 - 53
JED - May 2013 - 54
JED - May 2013 - EW 101
JED - May 2013 - 56
JED - May 2013 - 57
JED - May 2013 - 58
JED - May 2013 - Book Review
JED - May 2013 - 60
JED - May 2013 - AOC News
JED - May 2013 - 62
JED - May 2013 - 63
JED - May 2013 - 64
JED - May 2013 - Index of Advertisers
JED - May 2013 - JED Quick Look
JED - May 2013 - cover3
JED - May 2013 - cover4
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