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angle from the boresight to produce a circular symmetrical beam pattern. The RF energy emitted from the feed horn is vertically polarized. The rotation pattern is such that the phase front of radiated energy is not affected during rotation. Therefore, the radiated energy from the feed horn, which is incident on the parabolic reflector, is still vertically polarized.
760:
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The capture antenna subassembly, like the main antenna, is a
Cassegrainian type. It consists of a circular waveguide feed horn, a polarized parabolic reflector, and a polarization converter. The circular waveguide feed horn operates in the transverse electric mode. The feed horn is skewed at a preset
241:
The CW feed horn facing the main dish and the four horns of the C-band feed horn assembly are cross-polarized, thereby reducing incident X-band radiation on the C-band, four-horn cluster. In addition, low-pass filters inserted in all the microwave channels leading to the receiving system effectively
229:
The C-band feed horn assembly radiates horizontally-polarized RF energy that is reflected by the horizontal wires of the subdish. The C-band energy is again reflected by the main dish and rotated 90 degrees to vertical polarization. The vertically-polarized C-band energy is then radiated through the
254:
The parabolic reflector serves as a vertically polarized focusing radome. Therefore, horizontally polarized energy is reflected and only vertically polarized energy is transmitted. Since the RF energy from the feed horn is horizontally polarized, the radome reflects and focuses this incident energy
237:
The two X-band feed horns are mounted back-to-back near the focus of the parabolic surface. The X-band feed horn facing the main dish radiates vertically polarized RF energy. The subdish is transparent to this radiation, and the main dish reflects it as a narrow beam for CW illumination. The X-band
233:
The comparator forms track and guidance RF energy into the track and guidance beams, and extracts range, elevation, and traverse information from each target return. The C-band feed horn assembly consists of a four-horn monopulse cluster located at the vertex of the parabolic surface. Guidance RF
225:
The main dish consists of a parabolic metal surface with a dielectric support grating of parallel wires. The parabolic surface acts as a rotational reflector that reflects either vertically or horizontally polarized incident RF energy. The incident RF, when reflected, is rotated 90 degrees. The
806:
There are several different, incompatible "frequency band" systems that use the same lettering. The SPS-55 is typically described as "C-band" in relevant literature, under an older system where "C-band" corresponded to the 3900 - 6200 Mc frequency range. Other sources refer to it as
238:
feed horn facing away from the main dish transmits X-band, vertically polarized RF energy as a broad beam centered about the main CW illuminating beam. This provides the rear reference beam, which provides the missile with identification of the proper illumination radar.
262:
The operation of the polarization converter is identical to the polarization converter of the main antenna assembly. Therefore, the horizontally polarized incident energy is reflected as vertically polarized energy and transmitted through the radome as the capture beam.
221:
The main antenna is a
Cassegrainian design, consisting of a main dish, subdish, support structure, comparator, and feed horn assembly for C-band radiation. An X-band feed horn assembly is mounted in front of the reflectors. The entire assembly is protected by a radome.
258:
The polarization converter consists of metal plate polarization grids, which are one-quarter wavelength (C-band frequency) in thickness and bonded to the surface of the plate. The polarization grids are oriented at an angle of 45 degrees to the incident energy.
212:
The SPG-55 has two antennas: the main antenna, and the capture antenna. The main antenna handles tracking, guidance, and CW illumination. The capture antenna is used to capture and guide the beam-riding
Terriers into the guidance beam.
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beam, and the capture antenna, which provides the capture beam. The capture-guidance mode is employed for control of beam-riding missiles, and the track cwi mode is used for semi-active radar homing (SARH) missiles.
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subdish consists of a hyperbolic dielectric surface with grating of horizontal wires. This surface reflects polarized RF energy but is transparent to vertically polarized radiation.
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The AN/SPG-55B antenna assembly consists of two separate antennas: the main antenna, which provides the track beam, guidance beam, and
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energy is generated by the guidance transmitter and shares the same feed horn assembly. It is radiated as a conically-scanned beam.
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The designation "AN" stands for "Army-Navy" while "SPG" is not an acronym, but part of the MIL-STD-196E
554:. Washington D.C.: Naval Education and Training Program Development Center, US Navy. pp. 8-4–8-9
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Warbirds of the sea : a history of aircraft carriers & carrier-based aircraft
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44:
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Haskell, Robert L.; Shelton, Mitchell (September 1985). "Chapter 8: Collimation".
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Radars and
Computers aboard USS Sterett and other Warships during the Vietnam War
588:. Naval Education and Training Program Development Center. 1979. pp. 255–256
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Department of
Defense Standard Practice Joint Electronics Type Designation System
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AN/SPG 55B - Supported Beam-riding and homing
Terrier missiles as well as newer
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658:. Christopher Chant. Newton Abbot : David and Charles. 1979. pp. 226–229.
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as part of the Mk 76 missile fire control system. It was controlled by a
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Combat Fleets of the World, 1976/77: Their Ships, Aircraft, and
Armament
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A Compendium of
Armaments and Military Hardware (Routledge Revivals)
451:
A Study of the World's Naval
Surface-to-Air Missile Defense Systems
353:
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Relationship between CW Illumination and Track beams on AN/SPG-55.
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Third letter (purpose) - G = Fire
Control or Searchlight Directing
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This article incorporates text from this source, which is in the
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filter out any X-band signals superimposed on C-band channels.
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AN/SPG-55 Radar track, guidance, and capture beam relationships
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AN/SPG 55A - Supported Beam-riding and homing Terrier missiles
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missiles (SM-1ER/SM-2ER). It was used for target tracking and
710:. Hoboken: Taylor and Francis. pp. 191–193, 198–202.
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First letter (installation) - S = Water (surface ship)
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419:Couhat, Jean Labayle; McDonald, James J. (1976).
401:List of military electronics of the United States
742:NAVPERS 10794-C: Shipboard Electronic Equipments
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453:(Thesis). Naval Postgraduate School. p. 55.
35:with Mark 10 Terrier/Standard missile launcher
163:Second letter (type of equipment) - P = Radar
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95:Fire control quality three-dimensional data
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833:Military electronics of the United States
613:. Atglen, PA: Schiffer Pub. p. 424.
585:NAVEDTRA 10200-D: Gunner's Mate M 1&C
208:Layout of antenna assembly for AN/SPG-55
121:was an American tracking / illumination
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371:AN/SPG 55 - Original version supported
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425:. Naval Institute Press. p. 450.
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467:Friedman, Norman (January 1, 1981).
493:"MK 76 Missile Fire Control System"
449:Saraparung, Sukij (December 1974).
105:Rear view of the AN/SPG-55B aboard
739:Bureau of Naval Personnel (1969).
14:
285:Kitty Hawk-class aircraft carrier
255:into the polarization converter.
763: This article incorporates
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358:An SPG-55 on the starboard side
339:Giuseppe Garibaldi-class cruiser
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770:NAVEDTRA 10277 (September 1985)
510:Department of Defense (1998).
87:300,000 yd (150 nmi)
1:
344:Vittorio Veneto-class cruiser
607:Musciano, Walter A. (1994).
551:Fire Controlman Second Class
471:. Conway. pp. 179–180.
704:Chant, Christopher (2014).
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334:Andrea Doria-class cruiser
230:subdish as a narrow beam.
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300:Farragut-class destroyer
154:Type Designation System
765:public domain material
686:: CS1 maint: others (
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41:Country of origin
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290:Belknap-class cruiser
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67:X-band (Illuminator)
54:Missile fire-control
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295:Leahy-class cruiser
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774:United States Navy
655:The World's navies
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279:United States Navy
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717:978-1-134-64668-5
383:Standard missiles
375:Terrier missiles.
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592:17 February
558:17 February
469:Naval Radar
373:Beam riding
315:USS Truxtun
142:UNIVAC 1218
828:Sea radars
822:Categories
407:References
144:computer.
726:881416258
682:cite book
360:USS
119:AN/SPG-55
107:USS
92:Precision
59:Frequency
29:USS
17:AN/SPG-55
629:31050577
390:See Also
350:Variants
674:5798981
362:America
127:Terrier
79:427 Hz
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171:Design
109:Worden
794:Notes
767:from
123:radar
84:Range
31:Mahan
722:OCLC
712:ISBN
688:link
670:OCLC
660:ISBN
625:OCLC
615:ISBN
594:2023
560:2023
473:ISBN
427:ISBN
148:Name
129:and
125:for
117:The
51:Type
190:cwi
75:PRF
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
