It improves performance against small targets when
subjected to stand-off jamming.
The modification
primarily replaces the receiver’s sensitivity time control
(STC) with a sensitivity velocity control (SVC). SVC
uses radial velocity and target size information to
“filter” out birds and near-in clutter. It suppresses
these unwanted targets while retaining detection
performance throughout the volume of coverage. The
MPU also aids in reducing reaction time to only two
scans by providing very high-quality velocity
estimates for radar targets.
Configuration
The AN/SPS49(V) radar set contains 47 major
units in nine variant configurations, (V)1 through (V)9.
Figure 2-5 shows the physical configuration of the
AN/SPS-49(V) radar system.
The nine variant configurations are:
(V)1 Baseline radar
(V)2 AN/SPS49(V)1 radar without the
coherent side lobe cancellation
feature
(V)3 AN/SPS-49(V)1 radar with the radar
video processor (RVP) interface
(FC-1)
(V)4 AN/SPS49(V)2 with the RVP
interface
(V)5 AN/SPS-49(V)1 with automatic
target detection (ATD)
(V)6 AN/SPS-49(V)3 without the cooling
system
(V)7 AN/SPS-49(V)5 without the cooling
system
(V)8 AN/SPS-49(V)7 with automatic
detection and tracking (ADT)
(V)9 AN/SPS-49(V)5 with medium PRF
upgrade (MPU)
SIGNIFICANT INTERFACES.— The AN/SPS-
49(V) radar interfaces with shipboard display systems
via conventional radar switchboards and NTDS
switchboards. Field Change 1 provides an optional
interface through the Dual Channel RVP and associated
equipment. In addition, the AN/SPS-49(V)5 version
interfaces with the AN/SYS-2(V) MDT system.
FOR THE MAINTAINER.— Solid-state tech-
nology with modular construction is used throughout the
radar, except for the klystron power amplifier and
high-power modulator tubes. Digital processing
techniques are used extensively in the AN/SPS-49(V)5,
7 and 8.
The radar has comprehensive BIT features, such as
performance monitors, automatic fault detectors, and
built-in-test equipment (BITE). The AN/SPS-49(V)5,
7, and 8 include automatic, on-line, self-test features.
Each major unit has test panels with fault indicators and
test points. There is also a test meter to monitor system
power supply voltage.
Maintenance
The AN/SPS-49(V) radar operates continuously
during deployment.
Radar maintenance is a
responsibility of the ET rating (NEC ET-1503 for
(V)1, 2, 3, 4, and 6 or ET-1510 for (V)5, 7, 8 and 9).
Basic maintenance involves module replacement and
planned maintenance (PM) and follows the policies
s e t f o r t h i n N A V S E A I N S T 4 7 0 0 , 1 a n d
NAVMATINST 4700.4B.
Organizational maintenance consists of PM and CM,
performed on the radar in place, while the ship is
underway. CM is limited to (1) fault isolation, (2) removal
and replacement of modules or cabinet-mounted piece
parts, and (3) the adjustment, alignment, and testing
required to correct the radar degradations. All repairable
modules are shipped to DOP for repair as directed by
SPCC Mechanicsburg.
Removing and replacing the radar antenna and various
major antenna subassemblies require intermediate-level
maintenance. These tasks are conducted as directed by the
NAVSEASYSCOM Restoration Program.
AN/SPS-40B/C/D/E
The AN/SPS-40B/C/D/E is the primary shipboard
long-range, high-powered, two-dimensional (2D), air
search radar. It provides 10-channel operation, moving
target indicator (mti), pulse compression, and high data
short range mode (SRM) for detecting small,
low-altitude, close-in targets. Designed for use aboard
frigate-size or larger ships, the AN/SPS-40B/C/D radar
is used on the following types of ships:
AVT
FF
CC
CGN
DDG
Field Change 11, which changes the nomenclature
to AN/SPS-40E, replaces the tube-type power amplifier
with a solid-state transmitter (SSTX) and provides a
substantial improvement in operational availability.
The AN/SPS-40E radar is used on the following types
of ships:
AGF
DD
LHA
LPH
AOE
LCC
LPD
LSD
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