protection of space-based observations and the international telecommunication union (itu)

July 14, 2008 COSPAR SA 2008, E110 IUCAF session

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Protection of Space-based Observations and the International Telecommunication Union (ITU)

　　　　　　　　　 Masatoshi Ohishi

NAOJ


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Members of the ITU

Member States (191) Sector Members such as private

companies (567) Regional Groups International Organizations such as

IUCAF


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World Radiocommunication Conference

Revision of the Radio Regulations that has the status of an international treaty.

Study Groups, Working Parties consider technical aspects of agenda items for WRCs.


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Study Cycle (3~4 years)WRC;Admins.

CPM;Experts Study Groups

WPs, TGs

Agenda Items

Assign AIs

DraftCPMreport

CPM report

Adopt RadioRegulations

Exchange info


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Study Groups

drafting Technical bases for Radiocommunication Conferences

developing Draft Recommendations

compiling Handbooks


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Study GroupsSG 1:Spectrum ManagementSG 3:Radio Wave PropagationSG 4:Satellite ServicesSG 5:Terrestrial ServicesSG 6:Broadcasting ServiceSG 7:Science ServicesSC: Special Committee


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Working Parties

Study Groups are organized into Working Parties and Task Groups

Deal with specific aspects of Study Group work

Issues related with multiple SGs Joint WPs, Joint TGs


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SG 7

WP 7A : Time signals and frequency standard emissions

WP 7B : Space radio systemsWP 7C : Earth-exploration satellite systems and meteorological elementsWP 7D : Radio Astronomy


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ITU Web page

http://www.itu.int/ top page http://www.itu.int/ITU-R/

Submitted documents appear on the Web.

You need a TIES account to download

files.


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Recommendations

The ITU-R Recommendations provide a body of technical, operational and regulatory / procedural information that has been agreed upon by the participating administrations.

RA series – Radio Astronomy

RS series – Remote Sensing

SA series - Space Services


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Current Frequency Allocations

9 kHz – 275 GHz

< 9 kHz : 5.53 Administrations authorizing the use of frequencies

below 9 kHz shall ensure that no harmful interference is caused thereby to the services to which the bands above 9 kHz are allocated.

5.54 Administrations conducting scientific research using frequencies below 9 kHz are urged to advise other administrations that may be concerned in order that such research may be afforded all practicable protection from harmful interference.


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Where are RA bands ?Frequency Bands(MHz) Frequency Bands(GHz)

13.360 - 13.410

25.550 - 25.670

37.5 - 38.25

73 - 74.6

150.05 - 153

322 - 328.6

406.1 - 410

608 - 614

1 400 - 1 427 (HI)

1 610.6 - 1 613.8 (OH)

1 660 - 1 670 (OH)

2 655 - 2 700

4 800 - 5 000 (H2CO)

10.6 - 10.7

14.47 – 14.50 (H2CO)0

15.35 - 15.40

22.21- 22.50 (H2O)

23.6 - 24.0 (NH3)

31.3 - 31.80

42.5 - 43.5 (SiO)

76 - 116

123 - 158.5

164 - 16700

200 - 231.500

241 - 275


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Adjacent to RA bandsIn many cases, there are satellite services

(FSS, MSS, BSS, etc) in downlink !!

RA can not avoid interference by choosing sites.

TG1/3 – TG1/5 – TG1/7 – TG1/9 (1995 - 1997 - 2000 - 2003 - 2007)

WRC-07 Agenda Item 1.21

1.21 to consider the results of studies, regarding the compatibility between the radio astronomy service and the active space services in accordance with Resolution 740 (WRC-03), in order to review and update, if appropriate, the tables of threshold levels used for consultation that appear in the Annex to Resolution 739 (WRC‑03);

TG1/9 – Compatibility Studies between RAS and Satellite Services (S-E)

July 14, 2008 14COSPAR SA 2008, E110 IUCAF session

Modifications to FN 5.347A5.347A In the bands:

137-138 MHz,

387-390 MHz,

400.15-401 MHz,

1 452-1 492 MHz,

1 525-1 559 MHz,

1 559-1 610 MHz,

1 613.8-1 626.5 MHz,

2 655-2 670 MHz,

2 670-2 690 MHz,

21.4-22 GHz,

Resolution 739 (Rev.WRC-07) applies. (WRC-07)


For GSO stations (in pfd)


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For Non-GSO stations (in epfd)


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Similar agenda item to AI 1.21 to consider protection of the EESS (passive) from the ground-based active services

More difficult to establish regulatory measures to protect EESS(p) Res. [COM5/4]

Power limits (hard limits) : 23.6-24 GHz, 31.3-31.5 GHz, 50.2-50.4 GHz and 52.6-54.25 GHz

Recommended limits: 1400-1427 MHz and 31.3-31.5 GHz



1.7 to consider the results of ITU-R studies regarding sharing between the mobile-satellite service and the space research service (passive) in the band 1 668-1 668.4 MHz, and between the mobile-satellite service and the mobile service in the band 1 668.4-1 675 MHz in accordance with Resolution 744 (WRC‑03);

Radioastron and future space-based RAS stations with similar orbital parameters with Radioastron will be appropriately protected.

Not many space science people participated in the discussion.July 14, 2008 19COSPAR SA 2008, E110 IUCAF

session

Ultra WideBand devices Regulatory measures adopted RAS problem has not been solved yet

• separation distance ~ 15 km is needed EESS is more serious

• geographical separation can not be used Little market penetration



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Above 10 THz issue

End of RR


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Optical Communication

Laser Communication by using f > 10 THz is under study (USA, Japan)

Interference at Optical/IR regions in near future ?


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Usage GSO/GSO, GSO/non-GSO crosslinks Non-GSO/non-GSO crosslinks GSO-ground links

• 200/283/311/353 THz• 1.50/1.060/0.965/0.850 m

Rec. ITU-R S.1590Technical and operational characteristics of satellites

operating in the range 20-375 THz


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275+ GHz & optical link

Agenda Item 1.6 for WRC-2011• Review & update footnote 5.565

up to 3000 GHz RAS, EESS(passive), SRS(passive)

• Consider procedure for optical link ground-based link only ?


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5.565 The frequency band 275-1000 GHz may be used by administrations for experimentation with, and development of, various active and passive services. In this band a need has been identified for the following spectral line measurements for passive services:

– radio astronomy service: 275‑323 GHz, 327‑371 GHz, 388‑424 GHz, 426‑442 GHz, 453‑510 GHz, 623‑711 GHz, 795‑909 GHz and 926-945 GHz;

– Earth exploration-satellite service (passive) and space research service (passive): 275-277 GHz, 294‑306 GHz, 316‑334 GHz, 342‑349 GHz, 363‑365 GHz, 371‑389 GHz, 416‑434 GHz, 442‑444 GHz, 496‑506 GHz, 546‑568 GHz, 624‑629 GHz, 634‑654 GHz, 659‑661 GHz, 684‑692 GHz, 730‑732 GHz, 851‑853 GHz and 951‑956 GHz.

Future research in this largely unexplored spectral region may yield additional spectral lines and continuum bands of interest to the passive services. Administrations are urged to take all practicable steps to protect these passive services from harmful interference until the date when the allocation Table is established in the above-mentioned frequency band. (WRC‑2000)

Your participation will make interference-free future !


protection of space-based observations and the international telecommunication union (itu)

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