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| name = AN/SPS-55
| name = AN/SPS-55
| image = USS Samuel B. Roberts SPS-55.jpg
| image = USS Samuel B. Roberts SPS-55.jpg
| caption = AN/SPS-55 antenna on [[USS Samuel B. Roberts (FFG-58)]]
| caption = AN/SPS-55 antenna on [[USS Samuel B. Roberts (FFG-58)|USS ''Samuel B. Roberts'' (FFG-58)]]
| country = [[United States]]
| country = [[United States]]
| introdate = 1971
| introdate = 1971
| number =
| number =
| type = Surface-search
| type = Surface-search
| frequency = [[I band]] (9.05 to 10.0 GHz)
| frequency = [[I band (NATO)|I band]] (9.05 to 10.0 GHz)
| range = greater than {{convert|50|nmi|km|1}}<ref>[http://www.fas.org/man/dod-101/sys/ship/weaps/an-sps-55.htm FAS.org - AN/SPS-55]</ref>
| range = greater than {{convert|50|nmi|km|1}}<ref>[http://www.fas.org/man/dod-101/sys/ship/weaps/an-sps-55.htm FAS.org - AN/SPS-55]</ref>
| altitude =
| altitude =
Line 13: Line 13:
| azimuth = 1.5º
| azimuth = 1.5º
| elevation = -10° to +10°, centered on the horizon
| elevation = -10° to +10°, centered on the horizon
| precision = ­
| precision =
| power = 130-160 kW peak power
| power = 130-160 kW peak power
}}
}}


The '''AN/SPS-55''' is a solid state surface search and navigation radar. It was developed by Cardion Electronics for the U.S. Navy under a contract awarded in 1971. It was originally developed for a class of ships known as Patrol Frigates, but it was also installed on numerous Cruisers, Destroyers and Minesweepers. It is an [[I band]] radar and it's antenna consists of two waveguide slotted arrays mounted back-to-back. One array provides [[linear polarization]] and the other provides [[circular polarization]]. Polarization is user selectable and the circular polarized array is more effective in reducing returns from precipitation.<ref>[http://www.tpub.com/content/et/14092/css/14092_52.htm Electronics Technician Vol 7 - AN/SPS-55]</ref>
The '''AN/SPS-55''' is a solid state surface search and navigation radar. It was developed by Cardion Electronics for the U.S. Navy under a contract awarded in 1971. It was originally developed for a class of ships known as Patrol Frigates, but it was also installed on numerous Cruisers, Destroyers, and Minesweepers. It is an [[I band (NATO)|I band]] radar and its antenna consists of two waveguide slotted arrays mounted back-to-back. One array provides [[linear polarization|linear polarisation]] and the other provides [[circular polarization|circular polarisation]]. Polarisation is user selectable and the circular polarised array is more effective in reducing returns from precipitation.<ref>[http://www.tpub.com/content/et/14092/css/14092_52.htm Electronics Technician Vol 7 - AN/SPS-55] {{webarchive |url=https://web.archive.org/web/20070926231507/http://www.tpub.com/content/et/14092/css/14092_52.htm |date=September 26, 2007 }}</ref>


==Features==
==Features==
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* Sector radiate
* Sector radiate


The effective range of the radar is from 50 feet to beyond 50 miles. It is primarily used to detect other ships, coastlines and navigation hazards.
The effective range of the radar is from 50 feet to beyond 50 miles. It is primarily used to detect other ships, coastlines and navigation hazards.

The "Sensitivity Time Control" automatically adjusts the gain of the RF receiver from low to high based on the time elapsed from the last transmitter pulse. This helps to adjust for the fact that nearby targets generate a larger return than distant targets of the same size.

The "Fast Time Constant Filtering" helps to remove targets which have a very large range size, like clouds, while passing targets with a smaller range size, like ships or aircraft.

The "Sector Radiate" allows the operator to turn off the transmitter for any sized pie shaped sector of the antenna's 360 degree rotation. An operator might want to do this to avoid detection by an enemy receiver which lies within a known or suspected location.

The installation of Field Change 13 disabled the antenna's circular polarisation feature. Field Change 13 was necessary to address reliability issues associated with the replacement version of the waveguide switch used for polarisation selection.


==Platforms==
==Platforms==
*{{sclass|Ticonderoga|cruiser|1}}: AN/SPS-73 has replaced the AN/SPS-55
*[[Ticonderoga class cruiser]]s
*[[Spruance class destroyer]]s
*{{sclass|Kidd|destroyer|1}}
*{{sclass|Spruance|destroyer|1}}
*[[Oliver Hazard Perry class frigate]]s
*{{sclass|Oliver Hazard Perry|frigate|1}}
*[[USS Avenger (MCM-1)|Avenger class countermeasure ship]]
*{{sclass|Avenger|mine countermeasures ship|1}}

==See also==
*[[Electronics Technician (United States Navy)|Electronics Technician]]
*[[List of military electronics of the United States]]


==References==
==References==
[[Image:USS Nicholson (DD-982) SPS-55 antenna.jpg|thumb|AN/SPS-55 antenna on [[USS Nicholson (DD-982)]].]]
{{reflist}}
{{reflist}}


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*[http://www.fas.org/man/dod-101/sys/ship/weaps/an-sps-55.htm FAS.org - AN/SPS-55]
*[http://www.fas.org/man/dod-101/sys/ship/weaps/an-sps-55.htm FAS.org - AN/SPS-55]
*[http://www.globalsecurity.org/military/systems/ship/cg-47-specs.htm GlobalSecurity.org: CG-47 Ticonderoga-class]
*[http://www.globalsecurity.org/military/systems/ship/cg-47-specs.htm GlobalSecurity.org: CG-47 Ticonderoga-class]
*[http://www.tpub.com/content/et/14092/css/14092_52.htm Electronics Technician Vol 7 - AN/SPS-55]
*[https://web.archive.org/web/20070926231507/http://www.tpub.com/content/et/14092/css/14092_52.htm Electronics Technician Vol 7 - AN/SPS-55]
*[https://wrc.navair-rdte.navy.mil/warfighter_enc/weapons/SensElec/RADAR/sps55.htm NAVAIR warfighters encyclopedia - AN/SPS-55]
*[https://web.archive.org/web/20041105105741/https://wrc.navair-rdte.navy.mil/warfighter_enc/weapons/SensElec/RADAR/sps55.htm NAVAIR warfighters encyclopedia - AN/SPS-55]


[[Category:Sea radars]]
[[Category:Sea radars]]
[[Category:Military electronics of the United States]]
[[Category:Military electronics of the United States]]
{{USN-stub}}

Latest revision as of 16:56, 11 August 2024

AN/SPS-55
AN/SPS-55 antenna on USS Samuel B. Roberts (FFG-58)
Country of originUnited States
Introduced1971
TypeSurface-search
FrequencyI band (9.05 to 10.0 GHz)
Rangegreater than 50 nautical miles (92.6 km)[1]
Azimuth1.5º
Elevation-10° to +10°, centered on the horizon
Power130-160 kW peak power

The AN/SPS-55 is a solid state surface search and navigation radar. It was developed by Cardion Electronics for the U.S. Navy under a contract awarded in 1971. It was originally developed for a class of ships known as Patrol Frigates, but it was also installed on numerous Cruisers, Destroyers, and Minesweepers. It is an I band radar and its antenna consists of two waveguide slotted arrays mounted back-to-back. One array provides linear polarisation and the other provides circular polarisation. Polarisation is user selectable and the circular polarised array is more effective in reducing returns from precipitation.[2]

Features

[edit]
  • Magnetron transmitter
  • Low noise RF receiver
  • Sensitivity time control
  • Fast time constant filtering
  • Sector radiate

The effective range of the radar is from 50 feet to beyond 50 miles. It is primarily used to detect other ships, coastlines and navigation hazards.

The "Sensitivity Time Control" automatically adjusts the gain of the RF receiver from low to high based on the time elapsed from the last transmitter pulse. This helps to adjust for the fact that nearby targets generate a larger return than distant targets of the same size.

The "Fast Time Constant Filtering" helps to remove targets which have a very large range size, like clouds, while passing targets with a smaller range size, like ships or aircraft.

The "Sector Radiate" allows the operator to turn off the transmitter for any sized pie shaped sector of the antenna's 360 degree rotation. An operator might want to do this to avoid detection by an enemy receiver which lies within a known or suspected location.

The installation of Field Change 13 disabled the antenna's circular polarisation feature. Field Change 13 was necessary to address reliability issues associated with the replacement version of the waveguide switch used for polarisation selection.

Platforms

[edit]

See also

[edit]

References

[edit]
  1. ^ FAS.org - AN/SPS-55
  2. ^ Electronics Technician Vol 7 - AN/SPS-55 Archived September 26, 2007, at the Wayback Machine
[edit]
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