Real-time Tail Doppler Radar Data Server

Real-time Tail DopplerRadar Data Server

Real-time Tail DopplerRadar Data Server

Paul Chang, NOAA NESDIS STAREmail: [email protected]

Tel: (301)763-8231

Jim Carswell, Remote Sensing SolutionsEmail: [email protected]

Tel: (508)362-9400

Paul Chang, NOAA NESDIS STAREmail: [email protected]

Tel: (301)763-8231

Jim Carswell, Remote Sensing SolutionsEmail: [email protected]

Tel: (508)362-9400

Real-Time Data (RTD) Chronology of Events • Informal efforts conducted since 2003 demonstrating transmission and display of

lower fuselage radar data and the 1 Hz serial data stream (flight level, SFMR, etc.)

• Real-Time Data (RTD) working group established in November 2008– Goals: To define and execute the formal pathways/procedures to flow data

from the NOAA aircraft into NCO for operational utilization by NWS– Key members: Michelle Mainelli (NCO), Jim Carswell (RSS), Sean McMillan and

John Hill (AOC), Paul Chang (NESDIS) and Dan Starosta (TOC)

• HFIP Observation Team established in November 2008 with one of its goals to:

– Transmit new data types from P3s (Doppler, AXBT, AWRAP, 1-Hz flight-level, WSRA), including software development.

– $60K of HFIP funding became available in 3Q FY09 to help support some of the software development work.

Project ObjectivesProject Objectives

Real-time Radar / Data Server:Real-time Radar / Data Server:• Aircraft-ground data communication server will provide in near real-time:Aircraft-ground data communication server will provide in near real-time:

• Processed Tail Doppler Radar Profiles (Doppler, spectral width, Z)Processed Tail Doppler Radar Profiles (Doppler, spectral width, Z)

• Lower Fuselage Reflectivity ProfilesLower Fuselage Reflectivity Profiles

• Scientific DataScientific Data

• File Builder will provide:File Builder will provide:

• Radar meta data files to NCO as the data becomes available. Will Radar meta data files to NCO as the data becomes available. Will contain processed Tail Doppler and/or Lower Fuselage radar profiles.contain processed Tail Doppler and/or Lower Fuselage radar profiles.

• Scientific and AXBT meta data files.Scientific and AXBT meta data files.

• Quality of service will be implemented that monitors aircraft-ground Quality of service will be implemented that monitors aircraft-ground communications and automatically handles disruptions.communications and automatically handles disruptions.

• Demonstrate capabilities in Winter Storms 2010.Demonstrate capabilities in Winter Storms 2010.

3 National Hurricane Conference – 12/1/2009

Question: Can we help? If so how?Question: Can we help? If so how?


Real-Time Data Flow Diagram

Project GoalsProject Goals

Data Availability:Data Availability:• Provide Tail Doppler Radar profiles, Lower Fuselage Radar profiles and scientific Provide Tail Doppler Radar profiles, Lower Fuselage Radar profiles and scientific

data through same system.data through same system.

• Send data via packets and/or file based.Send data via packets and/or file based.

• Extend real-time access of all data to NHC, HRD, STAR and other potential users.Extend real-time access of all data to NHC, HRD, STAR and other potential users.

Ground Processing:Ground Processing:• Enable ground processing of data versus processing data on board aircraft (e.g. Enable ground processing of data versus processing data on board aircraft (e.g.

John Gamache’s Doppler processing) by transmitting “raw” profiles.John Gamache’s Doppler processing) by transmitting “raw” profiles.

Data VisualizationData Visualization• Integrate radar data into the RSS Real-time Data Display as mosaic background Integrate radar data into the RSS Real-time Data Display as mosaic background

imagery.imagery.


Purpose: Can we help? If so how?Purpose: Can we help? If so how?

Real-time Radar Real-time Radar Profile DataProfile Data


Airborne Server:•Receives data packets from Sigmet processor & extracts radar profiles.

•Archives radar profile and ancillary data.

•For lower bandwidth data links, further profile data processing implemented (i.e. range gate averaging, bit remapping, compression, Gamache’s Doppler processing) to reduce data rates to within link budget.

•Build compressed packetized data and transmits to ground server.

•Transmits data as soon as it becomes available.

Ground Server•Receive packetized data, and rebuild radar profile data.

•Implement quality of control and ground processing of radar profiles.

•Build NCO standardized radar files and send to TOC server as they become available.

•Relay data packets to subscribed users.

RECORDNUMBER3

ITEMNUMBER3 DESCRIPTION

FORMAT

Type4 Detailed Description / Interpretation

HEADER1

1

1 Mission ID (i.e. Flight Date) Long Integer YYYYMMDD

2 Aircraft ID Short Integer 42 = N42RF, 43 = N43RF, 49 = N49RF

3 TD number Short Integer Tropical Depression Number (or invest / research flag)

2

1 Bins (range gates) Per Radial Short Integer Number

2 Range Delay Float meters (add to range calculation to get true range)5

2 Bin (range gate) Resolution Float meters

3 Radial Data Type Flag Short IntegerBit 0: Reflectivity (1 = present, 0 = not present)Bit 1: Doppler (1 = present, 0 = not present)Bit 2: Spectral Width (1 = present, 0 = not present)

3 1 Antenna Number Short Integer0=NOAA parabolic antenna on P3 1=dual French-built flat plane antennas on P3 2=dual flat plane antennas on G-IV

REPEATDATA

BLOCK2 4

1 Time Stamp Double Unix time (seconds since 1/1/1970)2 Radar Latitude Float degrees3 Radar Longitude Float degrees4 Radar Altitude Float meters5 Earth Relative Azimuth Float degrees (relative to east, increase clockwise)6 Earth Relative Incidence Float degrees

7 Reflectivity Radial Profile Short IntegerOnly present if flag is set, record 2, item 3, bit 0Units: tenths of dBZ (i.e. 305 = 30.5 dBZ)Length: defined by record 2, item 2

8 Doppler Radial Short IntegerOnly present if flag is set, record 2, item 3, bit 1Units: tenths of m/s (i.e. -125 = -12.5 m/s)Length: defined by record 2, item 2

9 Spectral Width Radial if present Short IntegerOnly present if flag is set, record 2, item 3, bit 3Units: tenths of m/s (i.e. 25 = 2.5 m/s)Length: defined by record 2, item 2

NCO Tail Doppler & Lower Fuselage Radar FilesNCO Tail Doppler & Lower Fuselage Radar Files


• Each file will contain 10 minutes of profile data.

NCO Tail Doppler & Lower Fuselage Radar FilesNCO Tail Doppler & Lower Fuselage Radar Files

1 Records 1, 2, 3 appear only once at the top of the file in the order given.

2 Record 4 repeats as a block to the end of the file.

3Record & line item numbers are not in the file. They are merely for grouping and organizing the data for these discussions

4 Assuming 32-bit Linux machine:

Short Integer - 2 byte signed integer

Float - single precision float ( 4 bytes)

Double - double precision (8 bytes)

5 Range Calculation:

Fortran folks: Range[bin] = RangeDelay + bin * BinResolution ; bin = 1 to BinsPerRadialC folks: Range[bin] = RangeDelay + (bin+1) * BinResolution ; bin = 0 to BinsPerRadial-1


Notes:

QUESTIONS ?INTERESTED END USERS ?

REQUIREMENTS ?


Documents

Real-time Tail Doppler Radar Data Server