FPS Series Radars

(Updated 13 February 2013)

AN/FPS-3

Exact Frequency: 1300 MHz

AN/FPS-6

Type of Radar: Height Finder
IEEE Band:
S Band
NATO Band: E Band
Exact Frequency: 2700-2900 MHz
Peak Power: 5 megawatts
Pulsewidth: 2 microseconds
PRF: 400 pps
Vertical Coverage: -2° to +32°
Azimuth Resolution: 3.2°
Horizontal Beamwidth: 3.2°
Elevation Accuracy: 1,000 ft
Scanning Rate: 20 or 30 cpm.
Maximum Instrumented Range: 200 Nautical Miles
Maximum Instrumented Altitude: 75,000 feet
Notes: This radar was the first long-range height-finding radar employed at SAGE locations around the US.

AN/FPS-7

Type of Radar: Search Radar with Height Finder, used for GCI functions.
IEEE Band: L Band
NATO Band: D Band
Exact Frequency: 1250 – 1350 MHz
Maximum Range: 270 miles
Maximum Altitude: 100,000 feet
Notes: Was used for air defense and traffic control functions at:
* New York City
* Kansas City
* Houston
* Spokane
* San Antonio
* Elsewhere

AN/FPS-8

Manufacturer: General Electric
Type of Radar
: Search Radar
IEEE Band:
L Band
NATO Band: D Band
Exact Frequency: 1280 – 1350 MHz
Peak Power: 1 megawatt
Beamwidth: 2.5 Degrees
Range Resolution: ¼ nautical miles
PRF: 360 hz
Pulsewidth: 3 microseconds
Notes: Over 200 were produced between 1954 and 1958. Variants include AN/GPS-3, AN/MPS-11, and AN/FPS-88.

AN/FPS-10D

Manufacturer: RCA
Type of Radar:
Height Finder
IEEE Band: X Band
NATO Band: I Band
Exact Frequency: 9230 – 9404 mHZ
Pulse Repetition Rate (PRR): 0.5 and 2 microseconds
Pulse Repetition Frequency (PRF): 539 pps
Power: 250 kilowatts
Maximum Instrumented Altitude: 60,000 feet
Maximum Instrumented Range: 200 miles
Power Input: 115 volts at 400 Hz

AN/FPS-14

Manufacturer: Bendix
Type of Radar: Acquisition
IEEE Band: S Band (2700 – 2900 GHz)
NATO Band: E Band
Power: 750 kW

AN/FPS-16

Exact Frequency (Fixed): 5480 + 30 MHz
Exact Frequency (Tunable):
5400 to 5900 MHz
Peak Power (Fixed Frequency):
0.7 to 1.3 megawatts
Peak Power (Tunable Frequency):
0.2 to 0.4 megawatts
Pulse Widths: 0.25, 0.5, 1 usec
Pulse Rates: 71, 80, 142, 160, 285, 320, 341, 366, 640 (for XN-1 delete 80 add 233)
Receiver Frequency: 5400 to 5900 MHz
Receiver Noise Figure: 11 dB
Antenna Type: 13 ft. parabolic reflector
Antenna Gain: 43.5 dB
Antenna Scan: Circle and Sector Polarization
Antenna Azimuthal Coverage: 360°
Antenna Vertical Beamwidth: 1.2°
Antenna Elevation: -10° to 190°
Accuracy: ±5 yards in range, ±0.2 milliradians in angle

References:
[1] “Saturn Launch Vehicles” by NASA in 1964 (Where most of the information came from)
[2] Hawaii Range Complex Draft EIS/OEIS, Appendix E (July 2007) (PDF)

AN/FPS-18

Manufacturer: Bendix
Type of Radar: Acquisition
IEEE Band: S Band (2700 – 2900 GHz)
NATO Band: E Band
Power: 1 megawatt

AN/FPS-19

Maximum Instrumented Range: 160 Nautical Miles

AN/FPS-20

Manufacturer: Bendix
IEEE Band: L Band (1250-1350 MHz)

AN/FPS-23

Exact Frequency: 475-525 MHz
Power: 1 kilowatt

AN/FPS-24

Manufacturer: General Electric
Type of Radar: 2D Surveillance
IEEE Band: G Band
NATO Band: A Band
Exact Frequency: 214 – 236 MHz
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities. Twelve systems were built and the first one became operational on 30 June 1968.

AN/FPS-26

Manufacturer: AVCO Manufacturing Company, Crosley Division
Type of Radar: Height-finder
IEEE Band: C Band
NATO Band: G Band
Exact Frequency: 5400 – 5900 MHz
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities.

AN/FPS-27

Manufacturer: Westinghouse
Type of Radar: Surveillance and Heightfinding (Stacked Beams)
IEEE Band: S Band
NATO Band: E Band
Exact Frequency: 2320 – 2680 MHz
Maximum Range: 220 nautical miles
Maximum Altitude: 150,000 feet
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities. Twenty units were built, the first became operational in 1963.

AN/FPS-28

Manufacturer: Raytheon
Type of Radar: 2D Surveillance
IEEE Band: L Band
NATO Band: C Band
Exact Frequency:
510 – 690 MHz (other sources say 410 to 690 MHz)
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities.

AN/FPS-30 “Sentinel”

IEEE Band: L Band
NATO Band: C Band
Exact Frequency: 570-630 MHz
Peak Power: 150 kilowatts
Average Power: 3 kilowatts

AN/FPS-31 (XD-1)

Beamwidth: 18 degrees vertical
Scan Rate: 6 rpm
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities. Only one was built, and was essentially a prototype for other FD radars. During early development, ignition noise from vehicles driving by the radar site, which was just seaward of U.S. Route 1, jammed the radar; and AN/APN-1 FM radar altimeters on aircraft passing through the coverage of the radar also caused interference.

AN/FPS-35

Manufacturer: Sperry
Type of Radar: 2D Surveillance
IEEE Band: P Band
NATO Band: B Band
Exact Frequency: 400 – 450 MHz
Notes: Part of the USAF Frequency-Diversity program to succeed existing SAGE equipment and provide better ECCM capabilities. First deployed in December 1960, four were in service by 1962. Eventually 12 would be built in the US. The antenna weight of some seventy tons caused frequent bearing problems while in service.

AN/FPS-36

Notes: The AN/FPS-36 is an AN/TPS-1D with a 40 x 11 foot antenna and various modifications to increase it's maximum range to 200 nautical miles.
References:
US Army Official Documentation on AN/TPS-1G

AN/FPS-49

IEEE Band: P Band
NATO Band: B Band
Exact Frequency: 425 MHz
Pulse Repetition Rate/Frequency (PRR/PRF): 27 pps
Pulse Width: 2000 usec
Peak Power: 5 megawatts
Antenna Gain: 38 db minimum at midband
Beam Dimensions: 2 degree beamwidth
Power Input: 416 VAC, 480 VAC, 120/280 VAC, 60 Hz, 3 phase
Notes: Located at BMEWS site III. Very similar to AN/FPS-49A, which is at BMEWS site I, and the AN/FPS-92, which is at BMEWS site II.

AN/FPS-71

IEEE Band: L Band (1220 – 1350 Mhz)
NATO Band: D Band
Maximum Range: 200 nautical miles
Minimum Range:
0.15 nautical miles
Horizontal Beamwidth: 1.4 degrees
Vertical Beamwidth: 6.2 degrees
Range Accuracy: 3% of range + 1 nautical mile (at maximum range)

AN/FPS-106 Weather Radar

Exact Frequency: 5450 – 5650 MHz
Peak Power: 500 kW
Pulse Width: 0.5 μS
PRF (PPS): 320
Antenna Gain: 35 dBi

Reference:
Hawaii Range Complex Draft EIS/OEIS, Appendix E (July 2007) (PDF)

AN/FPS-115 PAVE PAWS

Year Fielded: 1978
Manufacturer:
Raytheon
T/R Modules: 1,792 modules per face installed as of UNK_YEAR; can be upgraded to 5,354 modules per face.
Bandwidth: 420-450 MHz
Peak Power:
600 kW per face (with 340 W Peak Power T/R Modules)
Average Power: 150 kW per face (with 340 W Peak Power T/R Modules)
Duty Cycle: 25%

(Photograph of front of AN/FPS-115 Antenna Complex)
(Photograph of rear of AN/FPS-115 Antenna Complex)

References:
Radar Handbook by Merrill I. Skolnik; unknown edition.

AN/FPS-117 SEEK IGLOO

Year Fielded: 1980
Manufacturer:
General Electric
T/R Modules: 292 modules
Exact Frequency: 1215 – 1400 MHz
IEEE Band: L Band
NATO Band: D Band
Maximum Range: 200 to 250 nautical miles
MTBF: 1,076 hour specification (original)
Peak Power: 29 kW (with 100 W Peak Power T/R Modules)
Average Power: 5.2 kW (with 100 W Peak Power T/R Modules)
Scan Rate: 5 rpm
Duty Cycle: 18%
Pulse Width: 51.2 / 409.6 μS
PRF (PPS): 241
Antenna Gain: 38.6 dBi

Notes: Unmanned 3-D Phased Array Azimuth, Range, and height finding radar that replaced the DEW Line in conjunction with the AN/FPS-124. It can select between 18 randomly selected channels within its frequency band to counter jamming.

OX-60 IFF Interrogator for FPS-116
Peak Power: 2 kW
Scan Rate: 5 rpm
Frequency: 1,030 MHz
PRF (PPS): 241
Antenna Gain: 21 dBi

References:
[1] Radar Handbook by Merrill I. Skolnik; unknown edition.
[2]
Hawaii Range Complex Draft EIS/OEIS, Appendix E (July 2007) (PDF)

AN/FPS-118

IEEE Band: I Band
NATO Band: A Band (5 – 28 MHz)
Power: 1 megawatt
Minimum Range: 559.2~ miles
Maximum Range: 2,050.5~ miles
Notes: Over the Horizon Backscatter radar. Most were mothballed after the end of the Cold War.

AN/FPS-124

IEEE Band: L Band
NATO Band: D Band (1215 – 1400 MHz)
Minimum Range: 2 miles
Maximum Range: 70 miles
Maximum Altitude: 15,000 ft
Notes: Unmanned doppler radar that replaced the DEW Line in conjunction with the AN/FPS-117.