JED - May 2013 - 56

E W101
of energy increase from an object in the tracking window over
a preset time interval is above a certain threshold, the tracker could stop tracking. Then, when the energy in the tracker
drops to its previous level (as the flare leaves the tracking window) the tracker can start tracking again. See Figure 3. This

Energy
Increase
Threshold

Energy in Tracker

Flare
Leaves
Window

Time Window

SUSPEND TRACKING

Energy Level
Flare
Ignites

Tracking
Window

Tracker chooses
leading object in its window

Time

Figure 3: When a flare causes the energy in the tracker to rise more
than a fixed amount during a fixed time interval, the tracking can be
stopped until the flare leaves the window.

attractive response in the tracker so that it can be lured away
from its intended target. These are called “two color flares”
and are shown in Figure 2.

Separation caused by
flare deceleration

Rise-Time Related Defense
As discussed last month, a flare can decelerate at 300 m/s2,
and the IR threat’s tracking window is only about 200 meters
wide at acquisition. The flare must thus reach its maximum
energy in about half a second. This requires that the chemicals
chosen for flare construction must build up their energy extremely quickly. This creates a much higher rate of energy rise
than that from the afterburner of a jet engine. Thus, if the rate

Figure 4: In an attack from a beam, the tracker can choose the leading
object in its window to discriminate against a flare.

The Journal of Electronic Defense | May 2013

56
Next
exhibition dates.

SECURING
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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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