WMO Radio Spectrum Workshop Radiosonde Spectrum Issues Presented

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WMO Radio Spectrum Workshop. Radiosonde Spectrum Issues Presented By: David Franc Office of Radio

WMO Radio Spectrum Workshop. Radiosonde Spectrum Issues Presented By: David Franc Office of Radio Frequency Management March 2006

Purpose l Provide information on current status of radio frequency issues that may impact

Purpose l Provide information on current status of radio frequency issues that may impact global radiosonde operations 2

Outline Definitions l ITU-R Recommendations l History- Past Issues l Current Issues l –

Outline Definitions l ITU-R Recommendations l History- Past Issues l Current Issues l – – l Meteorological Satellites COSPAS-SARSAT Optical Metaids Equipment Standards Important Points 3

Definitions l l l International Telecommunications Union (ITU) – U. N. organization responsible for

Definitions l l l 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 4

Definitions Applied to Radiosondes l In the ITU, radiosondes fall under the radio service

Definitions Applied to Radiosondes l In the ITU, radiosondes fall under the radio service of meteorological aids (metaids) – Metaids include dropsondes and rocketsondes ITU Working Party 7 C (WP 7 C) is responsible for metaids l Metaids allocations: 400. 15 – 406 MHz, 1668. 4 – 1700 MHz and 35. 2 – 36 GHz l Metaids stations are licensed or provided frequency assignments by the country in which they operate l 5

ITU Regions Source: ITU Radio Regulations, 2004 Edition 6

ITU Regions Source: ITU Radio Regulations, 2004 Edition 6

Metaids ITU-R Recommendations

Metaids ITU-R Recommendations

Access to ITU-R Recommendations l Available at: http: //www. itu. int/publications/sector. aspx? lang=en&sector=1 l

Access to ITU-R Recommendations l Available at: http: //www. itu. int/publications/sector. aspx? lang=en&sector=1 l Copyrighted material- must be purchased – Single recommendation – Full series on CD – Yearly subscription l May obtain 3 free recommendations per year 8

ITU-R SA. 1165 Content: Technical characteristics, operational characteristics, and performance criteria for metaids systems

ITU-R SA. 1165 Content: Technical characteristics, operational characteristics, and performance criteria for metaids systems l Use: Provides technical and operational characteristics to others conducting sharing studies l Recently updated and is passing through the ITU-R approval process l 9

ITU-R SA. 1263 l Content: Interference criteria for metaids systems l Use: Provides aggregate

ITU-R SA. 1263 l Content: Interference criteria for metaids systems l Use: Provides aggregate interference levels for conducting sharing studies l Currently under revision in ITU-R WP 7 C 10

ITU-R SA. 1262 l Content: Sharing and coordination criteria (levels applicable to individual interference

ITU-R SA. 1262 l Content: Sharing and coordination criteria (levels applicable to individual interference sources) l Use: Provides single entry interference levels for conducting sharing studies l This recommendation is out of date and will be updated upon completion of the ITU-R SA. 1263 update 11

ITU-R SA. 1264 l Content: Addresses sharing between the mobile-satellite service and metaids l

ITU-R SA. 1264 l Content: Addresses sharing between the mobile-satellite service and metaids l Use: Supported the work of the WRCs (WRC-97 through WRC-2003) l This recommendation is obsolete and is recommended for suppression 12

ITU-R SA. 1258 l Content: Sharing between meteorological satellite (metsat) and Earth exploration satellite

ITU-R SA. 1258 l Content: Sharing between meteorological satellite (metsat) and Earth exploration satellite service (EESS) uplinks, and metaids in the band 401 -403 MHz l Use: Support work of WRC-97 l Needs to reviewed by WP 7 C 13

ITU-R SA. 1346 l Content: Recommended interference mitigation techniques for medical implant devices operating

ITU-R SA. 1346 l Content: Recommended interference mitigation techniques for medical implant devices operating in the 401 -406 MHz band l Use: Guidance to administrations developing rules for medical implant devices l Needs to be reviewed by WP 7 C 14

ITU-R SA. [OPTICAL METAIDS] l Content: Technical and operational characteristics of metaids devices operating

ITU-R SA. [OPTICAL METAIDS] l Content: Technical and operational characteristics of metaids devices operating in the optical frequency range l Use: Information to the ITU-R l Passing through the ITU-R approval process- currently on the ITU-R website as document SA. 7 BL 7 15

ITU-R SA. [USE 1. 7 GHz] l Content: Facilitate sharing between metaids and metsat

ITU-R SA. [USE 1. 7 GHz] l Content: Facilitate sharing between metaids and metsat in 1670 -1700 MHz l Use: Guidance to metaids and metsat operators for selection of operating frequencies l Passing through the ITU-R approval process- currently on the ITU-R website as document SA. 7 BL 8 16

History- Metaids Spectrum Issues

History- Metaids Spectrum Issues

History- Metaids Spectrum Issues The bands 400. 15 -406 MHz and 1668. 4 -1700

History- Metaids Spectrum Issues 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 l 400. 15 -401 MHz allocated worldwide to MSS at WARC-92 l 1670 -1700 MHz allocated in ITU Region 2 (N. and S. America) to MSS at WARC-92 l 18

History- Metaids Spectrum Issues (continued) Studies within the ITU show that the MSS would

History- Metaids Spectrum Issues (continued) Studies within the ITU show that the MSS would cause interference to metaids if common spectrum is used by both l Proposals were made to WRC-95, WRC-97 and WRC-2000 for additional allocations to MSS in both metaids bands l No action taken by WRC-95, WRC-97 or WRC-2000 l WRC-2003 was held June 2003 l 19

History- Outcome of WRC-2003 No MSS allocation proposals in 400. 15 -406 MHz l

History- Outcome of WRC-2003 No MSS allocation proposals in 400. 15 -406 MHz l MSS an allocation in 1668. 4 -1675 MHz l Suppressed Region 2 allocation in 1675 -1700 MHz l Radio Regulations Footnote 5. 379 E l – Encourage metaids operations move out of 1668. 41675 MHz – Metaids in China, Iran (Islamic Republic of), Japan, and Uzbekistan are protected from MSS interference l Completed work on MSS sharing with metaids 20

Summary of Past Issues Current MSS allocations in 400. 15 -401 MHz and 1668.

Summary of Past Issues Current MSS allocations in 400. 15 -401 MHz and 1668. 4 -1675 MHz l MSS operations in 400. 15 -401 MHz will cause metaids data loss l Radio Regulations Footnote 5. 379 E l – Metaids operations in 1668. 4 – 1675 MHz should be avoided l No future actions for MSS spectrum anticipated 21

Current Metaids Spectrum Issues ØMeteorological Satellites ØCOSPAS-SARSAT ØOptical Metaids ØEquipment Standards

Current Metaids Spectrum Issues ØMeteorological Satellites ØCOSPAS-SARSAT ØOptical Metaids ØEquipment Standards

Meteorological Satellites Share 400. 15 - 403 MHz and 1670 -1700 MHz l Metaids

Meteorological Satellites Share 400. 15 - 403 MHz and 1670 -1700 MHz l Metaids cause interference to meteorological satellite (metsat) ground receivers in 1668. 4 – 1700 MHz l Metaids/metsat coordination has been ineffective in the past- is improving due to the actions of SGRFC l New ITU Recommendation developed by Study Group 7 l 23

Meteorological Satellites. Study Group 7 Recommendation l Avoid interfering with metsat user stations operating

Meteorological Satellites. Study Group 7 Recommendation l Avoid 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 24

COSPAS/SARSAT is a satellite-based search and rescue system for locating emergencies, operating at 406

COSPAS/SARSAT is a satellite-based search and rescue system for locating emergencies, operating at 406 -406. 1 MHz l Some metaids transmitters and associated windfinding radars are suspected of causing interference to the satellite receiver l Interference can prevent detection of a lifethreatening emergency situation l Causes: l – Metaids signals drifting above 406 MHz – Transmitter unwanted emissions above 406 MHz 25

Optical Metaids The ITU-R is collecting information on devices operating at optical frequencies l

Optical Metaids The ITU-R is collecting information on devices operating at optical frequencies l ITU-R is not regulating frequency use in the optical range l WP 7 C recommendation- optical metaids technical and operational characteristics l – sensor types: precipitation, visibility, sunshine and laser ceilometers 26

Equipment Standards l Under development in Europe and in other administrations l Will improve

Equipment Standards l Under development in Europe and in other administrations l Will improve interference immunity and reduce spectrum use l More details in later briefing 27

Important Points for Members

Important Points for Members

Improve Radiosonde Transmitters Inefficient use of radio spectrum can lead to forced reduction of

Improve Radiosonde Transmitters Inefficient use of radio spectrum can lead to forced reduction of available spectrum l WMO- radiosondes are being improved and spectrum requirements will decrease l Reduce spectrum requirements by reducing transmitter bandwidth, drift and unwanted emissions l Limit radiosonde operations to the allocated bands and preferably to the sub-bands recommended by the SG-RFC and ITU-R WP 7 C l 29

Document Radiosonde Characteristics and Operations Recommendation SA. 1165 documents radiosonde characteristics and operations l

Document Radiosonde Characteristics and Operations Recommendation SA. 1165 documents radiosonde characteristics and operations l SA. 1165 forms the basis for assumptions used in conducting spectrum sharing studies l Information is missing on Asia, Africa, and S. America l Members should submit information on their systems and operations to ITU Working Party 7 C or the SG-RFC l 30

Work with Your National Spectrum Regulators Every administration that is a member of the

Work with Your National Spectrum Regulators Every administration that is a member of the ITU-R has a national spectrum regulatory organization l Members should develop a working relationship with their spectrum regulatory agency l – 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 31

Conclusion l The meteorological community should strive to deploy radiosonde systems that: – Decrease

Conclusion l 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 l Participate in ITU-R meetings if resources allow l 32