Products

Miscellaneous: AN/SPS-55 (M) X-Band System

Mission The SPS-55(M) X-Band System - SEAHAWK is a solid-state radar system suitable for multi-mission application. Its primary mission is surface surveillance, which provides assistance in the safe navigation of vessels through narrow and congested channels and waterways, even under adverse weather conditions and darkness.

Other missions include Coastal Defense, Search and Rescue, Harbor Surveillance and Control, and low altitude Air Defense. SEAHAWK radars are installed in several harbor and coastal surveillance sites along NATO's Southern Flank.

The SEAHAWK aids in the defense against threats in coastal waters through detection of vessels involved in illegal fishing, smuggling, illegal immigration, and terrorist activities. In Search and Rescue operations, the SEAHAWK assists in the vectoring of surface and air assets to the search and rescue area, thereby providing a margin of navigational and flight safety.

During harbor surveillance operation it provides necessary real-time positions of vessels, buoys and other hazards to navigation and facilitates positive shipping control. Used in Air Defense, the SEAHAWK's effective low altitude surveillance coverage negates the potential low level strike advantage of adversaries. Data provided by SEAHAWK can be used in operational command and control centers to assist in guiding interceptors toward specific low altitude threats, or providing fire control support to other weapons.

Proven Performance The X-Band AN/SPS-55 is the U.S. Navy's prime electronic sensor of the DD 963, CG-47 and FFG class vessels. The system is the most widely used Navy surface search and navigation radar produced today. Designed and developed by Target Corporation for worldwide use is the SEAHAWK a derivation of the AN/SPS-55, with an improved receiver and IFF capability.

The Radar Set is packaged in four optimally-profiled units requiring minimum installation space:

• Class "A" Antenna (Dual X-Band/L-Band)
• Receiver/Transmitter
• Radar Set Control
• Antenna Safety Switch

FEATURES

• Integral MARK XII IFF antenna and system interface
• Proven shipboard dependability
• Modular, solid-state design with demonstrated reliability
• Lightweight and low-power consumption
• Ruggedized to MIL-E-16400
• Built-in fault and performance monitoring
• Selectable linear or circular polarization (back-to-back arrays)
• Antenna rotation with winds in excess of 90 knots
• Manufactured to meet ISO 9001 standard
• Dual pulse width (with automatic bandwidth selection) for optimum navigation and search performance
• Wide logarithmic dynamic range
• Automatic frequency control (AFC) with manual override enabling passive receiver operation in ECM environment
• Sector radiate with variable position and width
• Interface with standard Navy indicators
• Optional configurations available

Reliability & Maintainability

Availability is a key word for any radar, as equipment down-time can have a serious impact on mission performance.

The SEAHAWK employs modular construction to facilitate troubleshooting and repair by substitution. All complex circuitry is on plug-in printed circuit cards or easily removable chassis or modules. The circuitry is entirely solid state, keeping periodic maintenance time to a minimum.

Extensive self-check features, fault indicators, and test points serve as maintenance aids. The Radar Set Control Unit provides the operator with a visual indication of a fault and the receiver-transmitter front panel immediately localizes the fault to the functional group.

The SEAHAWK Radar has demonstrated MTBF (Mean Time Between Failure) in excess of 1200 hours and an MTTR (Mean Time To Repair) of less than 20 minutes.

Service Conditions

The SEAHAWK Radar is intended for deployment throughout the world within a broad range of environmental conditions. The system has been designed and constructed so that it can be stored and operated under these extreme conditions with no adverse effects.

Support

Target Corporation is a full-service company, experienced in the design and production of complex military equipment. Target Corporation maintains a full staff of experts for assisting customers in logistics support and planning, training and field support.

Quality Commitment

Target Corporation developed a quality management system to better satisfy the needs of its customers and to improve management of the company. The quality system complies with the International standard ISO 9001 - 1994. It covers the design, production, installation and servicing of the company's products.

Mobile Configuration Option

A completely mobile system is available to provide a quick reaction capability (either land or sea), with a typical deployment time of 10 minutes. This configuration allows transportation by the following methods:

• Towed while on mobilizers
• Loaded aboard a C-130 type aircraft
• Helicopter-lifted by means of slings
• Carried onboard ship
• Carried and/or operated on M-35 type truck

High Gain Antenna Options

• A High Gain Antenna configuration is also available to meet performance demands of the customer.
• Normal aperture of 7.5 x 1m
• X- Band frequency
• Gain of 46.5 dB
• Azimuth beanwidth of 0.3 (±10%), degs
• Azimuth Sidelobe level dB
  -27 inside 5°
  -34 between 5 and 10°
  -40 outside 10°
• Elevation Beamshape 1.8 (±10%), degs

System Options

Communications interface for data transmission Primary and secondary target correlation Raster scan display - Multi-channel scan conversion - Full color graphics Data fusion capability Plot extractor/tracker (PE/T) capability of tracking over 200 targets

TECHNICAL PARAMETERS

SYSTEM PARAMETERS

Operating Frequency
9.05 to 10.00 GHz continuously turnable

Instrumented Range
190 Km Long pulse
60 Km short pulse

Detection Range
(pd=.8): 23.6 Km for 2 square meter swerling1 target

Accuracy at 13 dB S/N Range
27 meters for .12 µs pulse
43 meters for 1 µs pulse

Azimuth
0.2 degrees

Resolution Range
22 meters for .12 µs pulse
188 meters for 1 µs pulse

Azimuth
1.5 degrees

Data Rate
3.75 sec (16 rpm)

MTTR
20 minutes maximum

MTBF
In excess of 1200 hours demonstrated

SERVICE CONDITIONS

Temperature:
(Receiver/Transmitter Unit and Radar Set Control)
Non-Operating: -62°C to +75°C (-80° F to + 167° F)
Operating: OIC to +50°C (+32°F to +122°F)
Antenna Pedestal: -28°C to +65°C (-18°F to +149°F)

Humidity:
Up to 95% at +60°C (+140°F) (MIL-E-16400)

Enclosure:
Receiver/Transmitter Unit and Radar Set Control 45°, dripproof.
Safety Switch, splashproof.
Antenna Pedestal, submergable to 3 feet.

Shock, Vibration, and Inclination:
MIL-E-16400 and MIL-S-901

Salt Spray:
MIL-E-16400

Heat Test:
MIL-E-16400

Weight:
Receiver/Transmitter: 260 kg
Antenna Group: 131 kg

INPUT

Power:
1100 watts nominal (less display)

Phase:
Single

Volts:
115 Vac ±10%

Frequency:
60 Hz ±5%

ANTENNA

Type:
Back-to-back, end-fed, slotted waveguide arrays, squint compensated/ integral IFF

Scan Rate:
16 RPM ±1 RPM clockwise

Polarization:
Selectable; circular or linear horizontal, X-Band (I/J-Band)

Antenna Gain:
Linear: 30 dB minimum at 9500 MHz (nominal gain variations of approximately ±1 dB over band)
Circular: No more than 4 dB down from linear over frequency band

Sidelobe Levels (Horizontal Plane):
Linear: -26 dB or better within 10°; -30 dB or better outside 10°
Circular: -25.5 dB or better within 10°; -30 dB or better outside 10°

Half-Power Beamwidth (Horizontal Plane):
1.5°

Half-Power Beamwidth (Vertical Plane):
20°

L-Band Type:
Epsilon Delta

Frequency:
1030/1090 ±10 MHz

Gain:
16 dbi peak

Beamwidth 3 dB:
Horizontal 4.0°
Vertical 11.0°

ISLS Switch:
Optional

Pedestal:
Single rotary joint

TRANSMITTER

Power:
130 kW peak minimum at magnetron (Coaxial Type)

Frequency:
9.05 to 10.00 GHz, tunable across band

Pulse Width:
Long: 1.0 µs ±0.1 µs
Short: 0.12 µs ±0.03 µs

PRF:
Long: 750 pps
Short: 2250 pps
(Swept mode ±5% in a pseudo random manner over 2 hour nominal)

Sector Radiate:
Sector Width: 10° to 180° azimuth
Sector Start: 0° to 360° azimuth

RECEIVER

Type:
LNA image suppression mixer-preamplifier

Noise Figure:
5 dB maximum at antenna port of circulator

IF Center Frequency:
60 MHz

Bandwidth:
Long Pulse: 1.2 MHz ±0.25 MHz
Short Pulse: 10 MHz ±01.0 MHz

Skirt Selectivity:
Narrow Band: 25 MHz maximum (80 dB down)
Wide Band: 250 MHz maximum (80 dB down)

Processors:
-Logarithmic/linear-logarithmic detection with 20 dB of Manual Gain Control in the lin-log mode
-AFC (Automatic Frequency Control) with manual override capability
-FTC (Fast Time Constant)
-STC (Sensitivity Time Control)

Minimum Range:
Short Pulse: 45 meters
Long Pulse: 275 meters

Range Resolution :
Short Pulse: 22 meters
Long Pulse: 198 meters

Minimum Discernible Signal:
1 µs Pulse
Width: -107 dBm or better
0.12 µs Pulse
Width: -98 dBm or better

INTERFACE SPECIFICATION

IFF Pretrigger (2 Outputs):
Occurs 50 ±2 µs before indicator trigger (zero range)
Amplitude: 20 ±5V positive going
Impedance: 75 ohms
Risetime: Less than 0.6 µs
Pulse Width: 3 ±1 µs

Indicator Triggers (4 Outputs):
Adjustable from time of transmitted pulse to 1.5 µs after to allow for various waveguide run lengths
Amplitude: 20 ±5V
Impedance: 75 ohms
Risetime: Less than 0.6 µs
Pulse Width: 3 ±1 µs

Blanking Pretrigger (3 Outputs):
Occurs 20 ±5 µs before indicator trigger
Amplitude: 20 ±5V
Impedance: 75 to 120 ohms
Risetime: Less than 0.6 µs
Pulse Width: 2 ±1 µs

Video (5 Outputs):
Amplitude: 2 to 3V (adjustable)
Limit Level: 2 to 3V (adjustable)
Impedance: 75 ohms, one video output is without ship's heading marker (SHM)

Synchro Information:
One-speed, five-wire synchro information, relative bearing oriented. (True bearing capability when used with ship's synchro amplifier.)

Complementary Radar Products

• ORION Coastal and Low Level Air Defense Radar System
• ALERT MIK III 2D Air Defense Radar System
• Type 5544 SeaAirSearch Radar Suite
• AN/SPS-502 C-Band Radar
• Digital Scan Converter DSC-320
• AN/SPA-25G EC-7 Display
• IFF/SSR Systems

8400 Lakeview Parkway, Suite 200
Pleasant Prairie, WI 53158
262-947-8400
Fax 262-947-8403

info@targetcorporation.com