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AN/SPS-58, AN/SPS-62, and AN/SPS-65 radars 


sps58

AN/SPS-58 and AN/SPS-65 radars

(United States)

Notes: Development of this 2D radar started in January 1967 as part of what later became the overall BPDMS (Basic Point Defense Missile System). The goal was to develop an air search / air target acquisition radar suitable for medium and low altitudes, with the goal of countering the Soviet SS-N-2 "Styx" anti-ship missile. After the Egyptian navy sank the Israeli destroyer Eilat with SS-N-2's later that year, development was quickly stepped up and for a while, this was the highest-priority system in the US Navy. To get a system into the fleet as fast as possible, Westinghouse purchased some of the technology associated with the West German army’s MPDR-45 radar from Siemens.

Identification of this radar is somewhat confusing as it can utilize a variety of external components. The more common was simply the back part of AN/SPS-10's dish, mated with a new dual feed horn. Systems with this antenna are designated AN/SPS-58A and -58C. The other version used a 16'-wide antenna and was designated AN/SPS-58B. This version had no display or control console, but fed directly into the ship’s fire control system. The -58A and -58C versions also fed into the FCS but had a stand-alone one-man console similar to AN/SPS-10's. Finally, the AN/SPS-58D had yet another antenna, a 9'6" rectangular slab; the -58D version operated similar to the -58A/-58C. The designation AN/SPS-62 was also reserved for Westinghouse and this project, this was to have been a higher-powered version with clutter-cancellation features. Nine examples were ordered in 1973 but quickly cancelled, it appears that Westinghouse simply rolled some of AN/SPS-62's features into AN/SPS-58D.

All versions used a 2-stage klystron transmitter.

A variety of ships carried AN/SPS-58 including some (but not all) of the Knox class frigates. AN/SPS-58 was also considered for the never-built "FTH-2"-class missile frigate in 1977; this was to have been an inexpensive, slow (24 ½ kts) AAW Atlantic convoy escort ship with a VLS for SAMs but not AN/SPY-1 Aegis.

The AN/SPS-65 was an upgraded version of AN/SPS-58. It had a direct feed into the ship’s Naval Tactical Data System (NTDS) (if the vessel was so equipped) which combined it’s data with another search radar’s to present all the information on that radar’s display, if so desired. This was quite useful when combined with a long-range air search radar with poor low-level coverage. Other improvements were a centriod feature (which averaged out returns on small fast-moving contacts to present only one target), an ability to use the system as a backup gun director for 5" or 3" guns, and usage of modern USN display symbols. Not many AN/SPS-65s were built and AN/SPS-65 was extinct by the turn of the millennium.

In all cases this radar was replaced by the TAS Mk23 / Mk91 FCS combination for RIM-7 NATO Sea Sparrow SAMs. It only survives now on exported ships. In December 2011 Taiwan announced it was planning on phasing out this radar. In 2012 South Korea likewise announced the type's retirement.

USERS: United States, South Korea, Taiwan

Operating band:

L

Range:

Instrumented max: 125NM

Avg vs small contact @ med alt: 61NM

Avg vs small contact @ low alt: 41NM

Avg vs small contact sea-skimming: 27NM

Accuracy:

+/- 608' in range, +/- ½ degree in bearing

Pulse characteristics:

7ms, 3065pps

Weight:

Antenna alone (-58C version): 439lbs

Complete system: 1600lbs

Antenna rotation:

20rpm

 

 

Entry created by: Jason W. Henson
Contributors: Jason W. Henson

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