Sharing the 1695 - 1710 MHz Band by aG52zz

VIEWS: 6 PAGES: 10

									 Engineering and Acquisition Branch
 Responsible for Engineering Modifications to NWS Operational Systems
 Responsible for Management of NWS Radio-Frequency Spectrum




                                                                     2
3
Radiosonde System Overview
Frequency Bands

                  Frequency Band          Usage

                  400.14 – 401 MHz       MetAids

                    401-402 MHz          MetAids

                    402-403 MHz          MetAids

                    403-406 MHz          MetAids

                  1668.4 – 1670 MHz   Radio Astronomy
                                          MetAids
                                           Fixed
                  1670 – 1675 MHz         Fixed
                                          Mobile
                  1675 – 1700 MHz        MetAids
                                         MetSat
                  1700 – 1710 MHz         Fixed
                                          MetSat

                                                        4
  Radiosonde Operations
  US Operations
 Launched at 00 and 12 UTC
  (Coordinated Universal Time)
     ~78,000 Launches/Year from 102
      Upper-air Stations
     Provides measures of pressure,
      temperature, humidity and winds
     Data archived at the National
      Climatic Data Center




                                        5
Radiosonde Operations
Worldwide Data Collection and Distribution


Radiosonde and other
measurement system data is
collected at National
Meteorological Centers
(NMC’s) and distributed
throughout the WMO
Regions (Africa, Asia, South
America, North America,
Central America, the
Caribbean, South-West
Pacific, Europe and
Antarctica.)


                                             6
Radiosonde Operations
Worldwide Operations – Global Climate Observing Systems (GCOS)




 Radiosonde Observations are an important element in the
   GCOS (Global Climate Observing System)

                                                                 7
    Radiosonde Operations
    Data Utilization

 Used to provide input to of computer based weather prediction
     models
    Provides data for operational weather, local severe thunderstorm
     and flash flood forecasting
    Used in developing aviation and marine forecasts
    Monitoring of air pollution dispersion
    Used for Weather and Climate studies and the development and
     archiving of Climatology records and atlases
    Calibration of Satellite and other remote sensing systems
    Atmospheric and Climate Research
    Input to GOS and GCOS
    Operations require low-cost expendable instruments
                                                                        8
Need for Frequency Coordination
Typical flights range 100 - 200 km
with prevailing winds.




                                     Some flights can reach a range
                                     of 300 km or more.


                                                                9
Radiosonde Relocation
Moving Operations to stay below 1679.6 MHz


 Sharing will have no impact on upper-air data products
 Redesign radiosonde transmitter to use less spectrum
 Upgrade Radiosonde Ground System Receiver to optimize
  signal reception
 Redesign must not increase cost of radiosonde instruments.
 Operational procedures can be modified to use lowest frequency
  channels during transition
 Additional analysis and studies are required finalize solutions



                                                                    10

								
To top