Kelvin Hughes

Submarine Radar

Submarine Radar

Kelvin Hughes provides the world's naval submarine services with navigation and surface search radars and pioneered the use of coherent pulse Doppler technologies for this role. As a result, Kelvin Hughes SharpEye™ naval radars are able to see small targets in sea, rain or land clutter that others will miss. See what you are missing...

Providing early warning of the presence of larger vessels, small targets and asymmetric threats as well as larger vessels increases the safety and capability of a submarine.

With a long history in the supply of naval radar, Kelvin Hughes has always been at the forefront and supplies 30 of the world's navies. The British Royal Navy standard KH1007 and KH2007 systems are still in service on both submarines and naval ships.

Launched in 2006, more than 25 navies now use SharpEye™ radars and displays, which delivers improvements in sub-clutter visibility by approximately 30dB, enabling targets with a low Radar Cross Section (RCS), typically 0.5m2, to be detected even in heavy rain and high sea states. Doppler processing enables clutter removal without picture degradation. This combined with a host of other unique and special features in the radar sensor, provides an unprecedented level of situational awareness.

  • Detection in clutter
  • Performance advantage
  • No magnetron - minimal routine maintenance requirements
  • High MTBF (Mean Time Between Failure)
  • Extremely low through life costs
  • Covert

For more information on Submarine Solutions

SharpEye™ Solid State Pulse Doppler Radar

The SharpEye™ I-Band (X-Band) radar transceiver for submarines is based on a downmast transceiver housed in an enclosure measuring only 743 x 487 x 300mm located within the pressure hull and provides submarines both in-service as a retrofit and new classes, a high performance solid state radar with similar capabilities to SharpEye™ radars installed on naval surface ships.

This downmast submarine radar solution makes use of the existing bulkhead infrastructure in the pressure hull, removing the need to the replace antenna mast system with a non-hull penetrating mast system and utilising the existing external antenna, rotational drive and waveguide connections. Kelvin Hughes also manufactures and supplies a pressure resistant 'AZL' submarine antenna.

Solid state radar ensures extremely high reliability and low through life costs:

  • No magnetron - minimal routine maintenance requirements
  • No fault-finding training required
  • Line replaceable unit - does not require radar trained technician to replace
  • Low Mean Time To Repair (MTTR)
SharpEye Transceiver

SharpEye™ transmits a low power patented pulse sequence, which enables short, medium and long range radar returns to be detected simultaneously, allowing the radar operator to maintain situational awareness regardless of the range scale setting of the radar display. Other users of the radar can select their own radar display range scale. A low peak transmission power (less than 300W) equivalent to a 25kW magnetron reduces the probability of intercept by ESM systems.

Doppler processing of radar returns provides coherent information concerning target velocity (radial) and enable the detection of very small and slow moving objects and targets with a low Radar Cross Section (RCS) and through a series of electronic filters is able to distinguish between the targets of interest and sea, rain and land clutter.

Other differentiating technologies include Moving Target Detection (MTD), providing enhanced clutter suppression at the Doppler processing stage and pulse compression of the return signal enabling a low transmit power providing efficient use of the radar and reducing the probability of detection by ESM equipment. Other Doppler radars may employ less advanced techniques such as Moving Target Indication (MTI), which does not take full advantage of the radial velocity information.

SharpEye™ is a truly multipurpose naval radar transceiver:

  • Navigation
  • Surface search
  • Bi-directional links to combat management system
  • Uniform transmission on all ranges so that multiple users on different range scales all see the optimum picture
  • Frequency diversity, user selectable frequencies to ensure interoperability
  Specifications subject to change without notice.
SharpEye™ Benefits and Features
  • Advanced capability
  • Affordable
  • Low cost of ownership
Ultra-high Reliability
  • Solid state electronics
  • Graceful degradation
  • Mil-Spec design
Clutter Suppression
  • Doppler processing
  • Small target detection
Incremental Capability
  • Capability Enhancements
  • Mission Updates
  • Useful life extension
Low Power
  • High pulse compression
Continuous Health Monitor
  • Built-in self test
  • System status monitor
Open Architecture
  • Independent display options
  • Camera/sensor interface
  • Gigabit Ethernet (ASTERIX)
  • Serial I/O
  • Fibre optic
Fully Coherent
  • Patented pulse sequence
  • Doppler processing
  • Moving Target Detection (MTD)
Blanking Sectors (Option)
  • Sectorised Transmission / Processing Modes
SharpEye™ Specifications
Operating Frequency 9.2 - 9.5 GHz I-Band (X-Band)
Frequency Diversity (FD) Optional
Frequency Channels Non FD 12 / FD 10
Peak Power Up to 300W
Average RF Power 39W
Output Power Transistor Type GaN
Duty Ratio Up to 13%
Pulse Compression Ratio Up to 1000:1
Signal Processor Doppler Processing
Clutter Discrimination Up to 16 filters
Clutter Suppression Automatic
Minimum Range ≤40m
Instrumented Ranges 24nm and 48nm
PRF 2300Hz
Pulse Lengths 0.1μS - 100μS
Reliability Up to 150,000 hrs MTBF
Power Modes High and low power modes