# JED - February 2018 - 32

```EW 101

Next Generation EW - Part 4

D

uring the Vietnam conflict, the most important
weapons were ZSU-23-4 Shilka systems. Each of
these highly-mobile, lightly-armored weapons
had 4 water cooled 23-mm anti-aircraft guns
with a lethal range
of 2500 meters against ground targets and against aircraft at less
than 1500 meters relative altitude. The Shilka can acquire and
track aircraft on the move, and
can acquire targets out to 20 km.
The ZSU-23 fires at a rate of 800 to
1,000 rounds per minute from each
gun. Later versions have six roofmounted SA-18 IR surface to air
missiles (SAMs) or side mounted
SA-16 IR SAMs, in addition to the
S
guns.

bandwidth is 2 MHz, the receiver noise figure is 5 dB and
the required pre-detection signal-to-noise ratio is 13 dB. This
means that the sensitivity of the radar receiver is -93 dBm, so
we will assume this signal level would occur at the maximum
acquisition range.

G = 41.5 dB

The Journal of Electronic Defense | February 2018

32

RCS = 10 m 2
2.5 km

ERPJ = 53 dBm

ERP = 104 dBm

OPEN LITERATURE
The acquisition and tracking
radar on the Shilka is Gun Dish,
which operates in J-band. Open literature gives its frequency range
as 12 to 18 GHz. Unfortunately, the
antenna parameters and effective
radiated power are hard to find in
open literature, so we will derive
some reasonable values for these
parameters using the formulas in
the side bar below.
For the operating frequency,
let's pick the mid-point between
12 and 18 GHz (i.e., 15 GHz). Then,
13 dB signal-to-noise ratio at the
maximum acquisition range of 20
km. To support other calculations,

J

Figure 1: A 10-square-meter RCS aircraft with a 53 dBm self-protection jammer is 2.5 km from a
Gun Dish radar on a ZSU-23-4 AAA weapon.

Figure 1: A
is 2.5 km from a Gun Dish radar on a ZSU-23-4 AAA weapon.

RBT

J

Jammer Signal
RCS = 10 m 2

ERPS = 104 dBm

ERPJ = 53 dBm
Range at which
there is 2 dB J/S

Figure 2: The burn through range for this problem is the range at which the jammer can only
Figure
2: The2burn
through range for this problem is the range at which the jammer can only achieve 2
achieve
dB J/S.
dB J/S.

```

# JED - February 2018

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
Tactical CEMA for the Mechanized Force
New Products
EW 101
AOC News
JED Quick Look
JED - February 2018 - intro
JED - February 2018 - cover1
JED - February 2018 - cover2
JED - February 2018 - 3
JED - February 2018 - 4
JED - February 2018 - 5
JED - February 2018 - The View From Here
JED - February 2018 - 7
JED - February 2018 - Conferences Calendar
JED - February 2018 - 9
JED - February 2018 - Courses Calendar
JED - February 2018 - 11
JED - February 2018 - From the President
JED - February 2018 - 13
JED - February 2018 - 14
JED - February 2018 - The Monitor
JED - February 2018 - 16
JED - February 2018 - 17
JED - February 2018 - 18
JED - February 2018 - 19
JED - February 2018 - World Report
JED - February 2018 - 21
JED - February 2018 - Big Challenges Ahead as DOD Tries to Address EMSO Implementation
JED - February 2018 - 23
JED - February 2018 - 24
JED - February 2018 - 25
JED - February 2018 - 26
JED - February 2018 - insert1
JED - February 2018 - insert2
JED - February 2018 - Tactical CEMA for the Mechanized Force
JED - February 2018 - 28
JED - February 2018 - 29
JED - February 2018 - 30
JED - February 2018 - New Products
JED - February 2018 - EW 101
JED - February 2018 - 33
JED - February 2018 - AOC News
JED - February 2018 - 35
JED - February 2018 - 36
JED - February 2018 - Index of Advertisers
JED - February 2018 - JED Quick Look
JED - February 2018 - cover3
JED - February 2018 - cover4
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