wmo radio spectrum workshop- radiosonde spectrum issues presented by: david franc office of radio...
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WMO Radio Spectrum Workshop-WMO Radio Spectrum Workshop-Radiosonde Spectrum IssuesRadiosonde Spectrum Issues
Presented By:
David Franc
Office of Radio Frequency Management
March 2006
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PurposePurpose
Provide information on current status of radio frequency issues that may impact global radiosonde operations
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OutlineOutline
Definitions ITU-R Recommendations History- Past Issues Current Issues
– Meteorological Satellites– COSPAS-SARSAT– Optical Metaids– Equipment Standards
Important Points
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DefinitionsDefinitions
International Telecommunications Union (ITU) – U.N. organization responsible for international regulation of radio spectrum use
International Radio Regulations – Treaty text maintained and enforced by the ITU that provides the regulations and table of frequency allocations for international radio spectrum use
Radio Service - A type of radio operation, such as meteorological satellites, broadcasting, mobile-satellite
Allocation – The authority for a radio service to use a particular frequency band
License (or Assignment) – Authority for a particular radio station to use a specific frequency under the defined technical conditions and consistent with a frequency allocation
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Definitions Applied to Definitions Applied to RadiosondesRadiosondes In the ITU, radiosondes fall under the radio
service of meteorological aids (metaids)– Metaids include dropsondes and rocketsondes
ITU Working Party 7C (WP 7C) is responsible for metaids
Metaids allocations: 400.15 – 406 MHz, 1668.4 – 1700 MHz and 35.2 – 36 GHz
Metaids stations are licensed or provided frequency assignments by the country in which they operate
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ITU RegionsITU Regions
5-01
75°
60°
40°30°20°
0°
20°30°
40°
60°
75°
60°
40°
30°20°
0°
20°30°
40°
60°
170° 140°160° 100°120° 60°80° 20°40° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180°
170°
170°
140°160° 100°120° 60°80° 20°40° 0° 20° 40° 60° 80° 100° 120° 140° 160° 180° 170°
ABC
ABC
REGION 1
REGION 2
REGION 3 REGION 3
Source: ITU Radio Regulations, 2004 Edition
Metaids ITU-R Metaids ITU-R RecommendationsRecommendations
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Access to ITU-R RecommendationsAccess to ITU-R Recommendations
Available at: http://www.itu.int/publications/sector.aspx?lang=en§or=1
Copyrighted material- must be purchased– Single recommendation– Full series on CD– Yearly subscription
May obtain 3 free recommendations per year
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ITU-R SA.1165ITU-R SA.1165
Content: Technical characteristics, operational characteristics, and performance criteria for metaids systems
Use: Provides technical and operational characteristics to others conducting sharing studies
Recently updated and is passing through the ITU-R approval process
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ITU-R SA.1263ITU-R SA.1263
Content: Interference criteria for metaids systems
Use: Provides aggregate interference levels for conducting sharing studies
Currently under revision in ITU-R WP 7C
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ITU-R SA.1262ITU-R SA.1262
Content: Sharing and coordination criteria (levels applicable to individual interference sources)
Use: Provides single entry interference levels for conducting sharing studies
This recommendation is out of date and will be updated upon completion of the ITU-R SA.1263 update
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ITU-R SA.1264ITU-R SA.1264
Content: Addresses sharing between the mobile-satellite service and metaids
Use: Supported the work of the WRCs (WRC-97 through WRC-2003)
This recommendation is obsolete and is recommended for suppression
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ITU-R SA.1258ITU-R SA.1258
Content: Sharing between meteorological satellite (metsat) and Earth exploration satellite service (EESS) uplinks, and metaids in the band 401-403 MHz
Use: Support work of WRC-97Needs to reviewed by WP 7C
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ITU-R SA.1346ITU-R SA.1346
Content: Recommended interference mitigation techniques for medical implant devices operating in the 401-406 MHz band
Use: Guidance to administrations developing rules for medical implant devices
Needs to be reviewed by WP 7C
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ITU-R SA.[OPTICAL METAIDS]ITU-R SA.[OPTICAL METAIDS]
Content: Technical and operational characteristics of metaids devices operating in the optical frequency range
Use: Information to the ITU-RPassing through the ITU-R approval
process- currently on the ITU-R website as document SA.7BL7
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ITU-R SA.[USE 1.7 GHz]ITU-R SA.[USE 1.7 GHz]
Content: Facilitate sharing between metaids and metsat in 1670-1700 MHz
Use: Guidance to metaids and metsat operators for selection of operating frequencies
Passing through the ITU-R approval process- currently on the ITU-R website as document SA.7BL8
History- Metaids History- Metaids Spectrum IssuesSpectrum Issues
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History- Metaids Spectrum History- Metaids Spectrum IssuesIssues The bands 400.15-406 MHz and 1668.4-1700
MHz were identified as potential sources of spectrum for the mobile-satellite service (MSS) in 1992
400.15-401 MHz allocated worldwide to MSS at WARC-92
1670-1700 MHz allocated in ITU Region 2 (N. and S. America) to MSS at WARC-92
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History- Metaids Spectrum History- Metaids Spectrum Issues (continued)Issues (continued) Studies within the ITU show that the MSS
would cause interference to metaids if common spectrum is used by both
Proposals were made to WRC-95, WRC-97 and WRC-2000 for additional allocations to MSS in both metaids bands
No action taken by WRC-95, WRC-97 or WRC-2000
WRC-2003 was held June 2003
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History- Outcome of WRC-2003History- Outcome of WRC-2003
No MSS allocation proposals in 400.15-406 MHz MSS an allocation in 1668.4-1675 MHz Suppressed Region 2 allocation in 1675-1700
MHz Radio Regulations Footnote 5.379E
– Encourage metaids operations move out of 1668.4-1675 MHz
– Metaids in China, Iran (Islamic Republic of), Japan, and Uzbekistan are protected from MSS interference
Completed work on MSS sharing with metaids
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Summary of Past IssuesSummary of Past Issues
Current MSS allocations in 400.15-401 MHz and 1668.4-1675 MHz
MSS operations in 400.15-401 MHz will cause metaids data loss
Radio Regulations Footnote 5.379E– Metaids operations in 1668.4 – 1675 MHz should
be avoidedNo future actions for MSS spectrum
anticipated
Current Metaids Current Metaids Spectrum IssuesSpectrum Issues
Meteorological SatellitesCOSPAS-SARSATOptical MetaidsEquipment Standards
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Meteorological SatellitesMeteorological Satellites
Share 400.15- 403 MHz and 1670-1700 MHz Metaids cause interference to meteorological
satellite (metsat) ground receivers in 1668.4 –1700 MHz
Metaids/metsat coordination has been ineffective in the past- is improving due to the actions of SG-RFC
New ITU Recommendation developed by Study Group 7
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Meteorological Satellites-Meteorological Satellites-Study Group 7 RecommendationStudy Group 7 RecommendationAvoid interfering with metsat user
stations operating above 1683 MHz– Metaids operations should be limited to the
frequency range 1675-1683 MHz– Metsat operations avoided in the range
1675-1683 MHz– Metsat downlinks to the main CDA stations
may still extend into 1675-1683 MHz
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COSPAS/SARSATCOSPAS/SARSAT
COSPAS/SARSAT is a satellite-based search and rescue system for locating emergencies, operating at 406-406 .1 MHz
Some metaids transmitters and associated windfinding radars are suspected of causing interference to the satellite receiver
Interference can prevent detection of a life-threatening emergency situation
Causes:– Metaids signals drifting above 406 MHz – Transmitter unwanted emissions above 406 MHz
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Optical MetaidsOptical Metaids
The ITU-R is collecting information on devices operating at optical frequencies
ITU-R is not regulating frequency use in the optical range
WP 7C recommendation- optical metaids technical and operational characteristics– sensor types: precipitation, visibility, sunshine and
laser ceilometers
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Equipment StandardsEquipment Standards
Under development in Europe and in other administrations
Will improve interference immunity and reduce spectrum use
More details in later briefing
Important Points for MembersImportant Points for Members
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Improve Radiosonde Improve Radiosonde TransmittersTransmitters Inefficient use of radio spectrum can lead to
forced reduction of available spectrum WMO- radiosondes are being improved and
spectrum requirements will decrease Reduce spectrum requirements by reducing
transmitter bandwidth, drift and unwanted emissions
Limit radiosonde operations to the allocated bands and preferably to the sub-bands recommended by the SG-RFC and ITU-R WP 7C
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Document Radiosonde Document Radiosonde Characteristics and OperationsCharacteristics and Operations Recommendation SA.1165 documents
radiosonde characteristics and operations SA.1165 forms the basis for assumptions used in
conducting spectrum sharing studies Information is missing on Asia, Africa, and S.
America Members should submit information on their
systems and operations to ITU Working Party 7C or the SG-RFC
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Work with Your National Work with Your National Spectrum RegulatorsSpectrum Regulators Every administration that is a member of the
ITU-R has a national spectrum regulatory organization
Members should develop a working relationship with their spectrum regulatory agency– Raise awareness of national spectrum regulators
to national meteorological spectrum requirements– Provides a mechanism for coordinating national
responses to proposals that could impact meteorological operations
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ConclusionConclusion
The meteorological community should strive to deploy radiosonde systems that:– Decrease spectrum requirements and make
efficient use of radio spectrum– Eliminate interference to other services
Become involved at the national level to ensure meteorological spectrum requirements are adequately defended
Participate in ITU-R meetings if resources allow