SPN-43C_Capabilities.pptx

AN/SPN-50(V)1 Industry Day 17 & 18 March, 2015

AN/SPN-43C Capabilities/Interfaces Mark Caggiano

NAWCAD 4.11.7

This brief is unclassified.

Bring ‘em Back Alive AIR TRAFFIC CONTROL SYSTEMS ● COMBAT IDENTIFICATION SYSTEMS ● LANDING SYSTEMS ● STRATEGIC PLANNING & DEVELOPMENT

NAVAL AIR TRAFFIC MANAGEMENT SYSTEMS

PMA213

UNCLASSIFIED

Bring‘em Back Alive

System Description The AN/SPN-43C Radar Set is an Air Search Radar (ASR) used for Aircraft Carrier and Amphibious Assault Ship Air Traffic Control. It is used on LHA, LHD, and CVN class ships.

It provides 360 degree Air Search out to 60 NMI with altitude coverage from radar horizon to 30,000 feet.

Air Traffic Controllers use the SPN-43 video displayed on the AN/TPX-42 consoles to guide aircraft to the landing approach path once the aircraft is within radar range. The aircraft is transitioned to a precision Approach Radar for final approach to touchdown.

UNCLASSIFIED

Bring‘em Back Alive AN/SPN-43C Major Units

Antenna Pedestal Unit 2 – IOC 1971 Receiver/Transmitter Unit 1 – IOC 1994

AN/TPX-42A(V)14

High Level Shipboard ATC Operational Concept

10 nm

AN/SPN-46(V)3 Supports Mode I, IA, II and III landing guidance Marshal Stack Precision Approach Approach/Marshal Control

CASE II/III, CASE I,

bolter and waveoff patterns supported

Guidance off the cat & departure

Standard NATOPS arrivals AN/SPN-43C & TPX-42A provides 50 nm radar coverage to support ATC guidance vectors for arriving aircraft. Aircraft separation and deconfliction of airspace with departing aircraft.

AN/SPN-43C& TPX-42A support ATC guidance vectors for departing aircraft, aircraft separation and deconfliction of airspace with approaching traffic A/C Departure Control

50 nm

Instrument Landing System AN/SPN-41 supports Mode II ILS glide slope guidance. SPN-41 also acts as an independent landing monitor for aircraft conducting Mode I/IA approaches with the AN/SPN-46(V)3

“Needles”

Bring‘em Back Alive System History

1965 AN/SPN-43

Solid state receiver and transmitter except for Magnetron, Thyratron, and TR Tubes Center mount antenna on AN/SPN-6 hydraulically stabilized pedestal

1971 AN/SPN-43A

New counterbalanced antenna and electrically stabilized pedestal (current system)

1983 AN/SPN-43B

Video distribution amplifier changed from vacuum tubes to solid state (current system) Circular polarization (current system)

1994 AN/SPN-43C

Dual channel receiver/transmitter with coaxial magnetron (current system)

Bring‘em Back Alive Future SPN-43C ATC Requirements Last Nimitz class carrier (CVN 77) George H.W. Bush was commissioned January 2009, potential for 45 years of support

LHA-Class ships are still being built and require the SPN-43C. With LHA-8 delivery in 2022, the potential is for 40+ years of support.

Bring‘em Back Alive

AN/SPN-43C

System Specifications Operational Frequency: 3500-3700 MHz (in 10 MHz increments) Maximum Range: 60nmi Minimum Range: 900 ft Range Resolution: 400 ft Minimum Aircraft Height: 600 ft from the radar source Maximum Aircraft Height: 30,000 ft @ 60 nmi Search Frame Time: 4 seconds (15 RPM) Azimuth Coverage: 360 degrees.

Azimuth resolution: 1.5 degrees Elevation Coverage: 36 degrees above horizontal

Bring‘em Back Alive Ship’s Motion Compensation: Pitch: +/- 5.0 degrees Roll: +/- 20.0 degrees Antenna Polarization: Horizontal (linear or circular) Antenna Gain: 33.4 dB minimum Antenna Beam tilt: 0 to 6 deg, variable Wind speed: Operating 75 knots, Non-operating 100 knots System Size and Weight:

Radar Set AN/SPN–43C: 9229 lbs. total Unit 1: Receiver/Transmitter Group OY–103/SPN–43C:

3240 lbs.

72” High x 101” Wide x 32” Deep Unit 2: Antenna Group: OE–138A/SPN–43A:

3314 lbs.

127’ High x 182’ Wide x 120’ Deep

AN/SPN-43C

System Specifications (cont.)

Bring‘em Back Alive Other Features Circular Polarization: The AN/SPN–43C radar antenna includes a polarizer assembly to enable the operator to select either linear or circular polarization mode. Circular polarization is used to reduce the limiting effects of rain backscatter.

A LOG IF channel is used as an aid in tracking targets through clutter and precipitation.

Blanking Triggers momentarily disable the receiver during the transmit time of the other shipboard radar.

Additional capabilities of the radar include fast time constant (FTC) and sensitivity time control (STC) features, which enhance tracking of targets through large blocks of signal or clutter appearing on the display. FTC also aids in tracking aircraft through precipitation; STC reduces display saturation from sea– return at close ranges.

Bring‘em Back Alive OY-103/SPN-43C Receiver/Transmitter

Transmitter Channel A Transmitter Channel B Receiver Channel B Receiver Channel A

Bring‘em Back Alive AN/SPN-43C Interfaces Radar Video Analog video and azimuth triggers are provided to the RADDS switchboard. TPX-42 pulls SPN-43 video from RADDS and aligns it with IFF data.

Stabilization Input Current antenna pedestal receives Synchro data input at 400 Hz, 2X and 36X for pitch and roll correction.

Synchro data source from Ship's gyrocompass equipment or equivalent 60 Hz to correct for ship's heading Future systems will receive digital ships motion data through the NAVSSI/NAVCRIT network

Bring‘em Back Alive Analog Video This is a TPX-42 display showing SPN-43 radar return. The display shows only a moderate amount of clutter, but is difficult to use to track aircraft. Weather and ducting can cover much more screen area.

BACK UP

AB-1192/SPN-43A Antenna Pedestal

Antenna Drive

Pinion Gearbox Motor Gearbox Azimuth Drive Motor

Bring‘em Back Alive Antenna Maintenance

Sailors are performing maintenance on the pedestal.

The main azimuth motor is being replaced.

Bring‘em Back Alive Frequency Loss Operational restrictions prohibit AN/SPN-43C transmission within 50NM of many shorelines National Broadband Plan may increase restrictions on system transmission Loss of operational capability impacting training within 50NM of most shorelines Loss of frequency spectrum could impact multiple ships with AN/SPN-43C operating in close proximity to each other No cost effective ECP option

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