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The National Weather Radar Testbed (Phased Array). Presentation for the. Working Group for Multifunction Phased Array Radar. Douglas Forsyth Executive Director for Facilities and Strategic Planning and Chief, Radar Research & Development Division. December 2006. Outline. Background

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Presentation Transcript
slide1

The National Weather Radar Testbed (Phased Array)

Presentation for the

Working Group

for

Multifunction Phased Array Radar

Douglas Forsyth

Executive Director for Facilities and Strategic Planning

and

Chief, Radar Research & Development Division

December 2006

outline
Outline
  • Background
  • Funding History
  • System Overview
  • Data Quality
  • Upgrades Completed
  • 1st Tornadic Data Set
  • Future Upgrades
collaborators
Collaborators

James Kimpel

Dusan Zrnic

Ron Ferek

Tom McNellis

Richard Vogt

Jerry Crain

Alan Shapiro

William Benner

John Heimmer

behind the scenes
Behind the Scenes

Allen Zahrai, Dick Doviak, Mike Schmidt and Richard Wahkinney

Bob Staples, John Carter, Igor Ivic

Roger Simer, Brian Frasco, Sheldon Katz, Tim Maese, Ann Wiser, Steven Silberstein, Wayne Sabin, Mark Campbell

Russell Cook

Richard Vogt

Susan Sedwick, John Havlicek

Nannette Kalani, Jim Olivo

Jim Melody, Les Lemon, Bob Blasewitz

more behind the scenes
More Behind the Scenes

Mark Benner, Mike Schmidt, Richard Wahkinney, Kurt Hondl, Allen Zahrai.

Bob Staples, Chris Curtis, Rick Adams, John Thompson, Dave Priegnitz, Dan Suppes

Mark Campbell, Tim Maese, Wayne Sabin, Tim Hughes, John Petree

B. Ballard

Susan Sedwick

Nannette Kalani

Jim Melody, Paul Baumgarder,

Bob Blasewitz, Tim Maese

additional collaborators
Additional Collaborators

Qin Xu, Mike Jain

Pam Heinselman, Sebastian Torres

Bob Palmer, Tian-You Yu, Mark Yeary, Phil Chilson, Guifu Zhang

Gary Mitchell

history
HISTORY
  • NSSL Advance - 1997
    • Desire to build a phased-array radar for weather applications
  • Visit by Lockheed-Martin - 1998
  • Established collaborations with Office of Naval Research, Lockheed-Martin, and University of Oklahoma - 1999
  • Added additional partners, NWS Radar Operations Center, FAA, NOAA, Oklahoma State Regents for Higher Education, Basic Commerce Industries
phased array radar support
Phased Array Radar Support

FY2000 - 2003

  • U.S. Navy ($10M), SPY-1 antenna ($10M)
  • NOAA/NWS - WSR-88D transmitter ($0.4M)
  • NOAA/OAR ($1.0M, EP)
  • Lockheed Martin ($1.0M in kind, EP)
  • Oklahoma State Regents ($1.0M, EP)
  • U. of Oklahoma ($0.5M, EP)
  • FAA ($8.0M)
  • Navy/NOAA/FAA MOU

2004 2005 2006 2007

NOAA $1M $1M $4M $3M?

FAA

(to NOAA) $.8M $.8M $0M

what is phased array
What is Phased Array?
  • Phasing = Timing
  • Analogous: Ears & Sound waves
  • Array of many Elements
  • 4-sided, no moving parts, scanned Electronically vs. mechanically (WSR-88D)
  • Results: Faster Scans, more flexible scans
phased array radar par
Phased Array Radar (PAR)

One Beam

Multi-Beam

nwrt equipment
NWRT Equipment

AN/SPY-1A

Position

Programmer

(APP)

AN/SPY-1A

Antenna

Environmental

Processor (EP)

WSR-88D Transmitter

Pedestal &

Antenna Pedestal Control (APC)

Real-Time Controller (RTC)

Receiver/Exciter

Testbed

Control

Center (TCC)

Radome

Facility

slide15

Passive Array

Min PRI = 800 msec

Short Pulse = 1.57 msec

Long Pulse = 4.71 msec

Sensitivity = 5.89 db at 50 km

Wavelength = 9.375 cm

slide16

Phased Array Antenna

Beam width

(Center) = 1.5 deg

Beam width

(+/- 45 deg) = 2.1 deg

Antenna Tilt = 10 deg

Antenna Height = 40 ft

Element

Module

136 modules

32 elements per module

4,352 elements

slide17

RAID

Development

System

Removable

Hard Drive

Operational

System

Environmental Processor (EP)

  • SkyComputers
  • Ultra SPARC – Host
  • 5 SKYbolt II modules each with 4 PowerPC G4 processors
  • CD, hard and removable hard drive
  • Ciprico RAID 648 Gbyte storage
  • Development System – 2 SKYbolt II modules
matrix pc replacing the environmental processor ep
Matrix PC replacing the Environmental Processor (EP)
  • Matrix PC
  • Six Supermicro PCs
    • Dual Intel Xeon 2.4Ghz
    • 2GB memory
    • Linux OS
  • Connected to RTC via Systran SL100 PCI Card
  • Myrnet Crossbar Switch
    • Direct PC to PC communication at 2 Ghz
  • 3 TB Raid
  • 24 Port Network Switch
  • One Node currently used to replace existing EP
multi use aircraft tracking
Multi-use Aircraft Tracking
  • FAA and BCI development
  • Uses Separate Processor for Data stream
  • Runs simulateously with Weather Data collection
2003 11 04 2123 utc vel
2003/11/04 2123 UTC (Vel)

KTLX 0.5 deg

NWRT 0.75 deg

nwrt status
NWRT STATUS
  • Data Quality Issues Corrected
    • Bad Velocities
      • Digital receiver filters
      • Clear Mode
    • Pulse Timing
    • Six Degree Phase error
  • Engineering Testing Phase Completed
  • Fixed STIM download problems
upgrades completed
Upgrades Completed
  • Backup Generators – Radar Facility and TCC
  • Continuous rotation 18 degrees per second
    • Volume scan (14 levels) less than 60 seconds
  • Improved display system
  • Improved User Interface
current work
Current Work
  • Continue to learn operational capabilities (i.e. scan strategies, various processing modes, etc.)
  • Collect data for comparisons with WSR-88D and TDWR during storm season
  • Use for various Research Projects
    • Transverse winds (NSSL/OU)
    • Refractive Index (OU)
    • Spectral Signatures of Tornadoes (OU/NSSL)
    • Clutter Canceling (NSSL/OU)
    • Scan Strategies – Beam Multiplexing (NSSL/OU)
current work1
Current Work
  • Add Remote Operations (completed, fine tuning)
  • Replace EP (completed, along with I/Q recording)
  • Integrate with WDSS-II algorithms and 3-D displays
  • Test Multi-use (FAA/BCI – aircraft tracking)
  • Testing beam multiplexing
  • Measure Antenna pattern
  • Emulate adaptive Volume scans
  • Start design of dual-polarized sub-array
beam multiplexing
Beam Multiplexing

Beam Multiplex

Difference

VCP 12

may 29 th comparison gridded
May 29th ComparisonGridded
  • Diff Times/Accuracy
  • Different Radar Locations
  • Ground Clutter
  • 2nd Trip
  • Polarization
  • Resolutions 1km vs. 244m
  • Sensitivity
  • Calibration errors
  • Beam Widths
  • Elevation Angle
  • PRT (Dwells)
research agenda 1 2 years
Research Agenda (1-2 years)
  • Learn Operational capabilities (I.e. scan strategies, various processing modes, etc.)
  • Collect data for comparisons with WSR-88D and TDWR during storm season
  • Use for various Research Projects
  • Add Remote Operations (completed, fine tuning)
  • Replace EP
  • Integrate with WDSS-II algorithms and 3-D displays
  • Test Multi-use (FAA – aircraft tracking)
  • Implement beam multiplexing
  • Start design of dual-polarized sub-array
future plans
Future Plans
  • Available as National Facility in December 2006
  • Adaptive scanning
  • Continue to test Multi-use applications
    • Wind profiling
    • Aircraft tracking
    • Chemical/Biological profiling
    • Initialization of Models
roadmap

WSR-15PWA Locations

Dual Polarization

ROADMAP

2025

2004

2007

2012

2015

thank you
THANK YOU

http://www.nssl.noaa.gov

vcp 12
VCP -12
  • Elevation Angles
    • 0.5
    • 0.9
    • 1.3
    • 1.8
    • 2.4
    • 3.1
    • 4.0
    • 5.1
    • 6.4
    • 8.0
    • 10.0
    • 12.5
    • 15.6
    • 19.5

The lowest three angles use "Split Cut" (CS/CD), middle angles use Batch (B), and

higher angles use Contiguous Doppler (CDX) mode.