NAOJ Radio Astronomybi
Frequency Subcommittee
Masao Saito(NAOJ Frequency ManagementCommittee Chair)
http://radio.mtk.nao.ac.jp/freqras/

Overview• The Radio Astronomy Frequencypunder the NAOJ
Subcommittee ((RAFS)) operate
Advisory Committee for Radio.
• RAFS deals with issues to protect radio
astronomy via various channels.
• RAFS Admin team regularly check and sharethe status. Committee meetings are held
every three months or so.
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Committee Members• Chair
Ch i MasaoM
SSaitoit (N(Nobeyama)b)• Vice‐Chair: Osamu Kameya (Mizusawa)• Members: Aoki (Yamaguchi.
(U. ),) Imai ((KagoshimaU. ), Ogawa (Osaka‐p U.), Kawabata (GSI), Kohno(U Tokyo)(U.
Tokyo), Tsuchiya (Tohoku U.),U ) Nagai (TsukubaU.), Nakajima (Nagoya U.), Murata (JAXA),
Yonekura (Ibaraki U.)• NAOJ Members: Kameno (Chile observatory),
Takebayashiy((Radio division),), Honma ((Mizusawa))• Ex‐officio: Iguchi (head of radio division in NAOJ)
Admin: Saito, Kameya, Takebayashi, Tsuneyama
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Lead Systems• Leadd systems introduced
id d ini technicalh i l discussion.
dii• High (> 50 GHz) : Saito (Nobeyama)• Mid (50 > f > 15 GHz): Kameya (Mizusawa)• MidMid‐Low
Low (15 > f > 1 GHz): Murata (JAXA)• Low (< 1 GHz): Tsuchiya (Tohoku)
High priority items are selected from WRC agendas
andd MIC
C action
i plan.
l Moreover new technologies
h l isuch as drones will be potentially threatening.
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ALMA/NRO/ASTE Users Meeting4Frequency Management Basics• ITU‐R (Radiocommunication Sector
International Telecommunication Union))• Soumu‐sho (MIC) is admin in Japan.
• Primary
PiSServicei andd SSecondarydSServicei• Active Service and Passive Service

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5Interaction• WP7D (working(ki party 7D ‐ radiodi astronomy))• MIC – admin in Japan
p– Join work team for certain objects (2016‐ 1.6 GHz,
20 ((dl)) and 30 ((ul)) GHz for ESIM))– Monitor public comments section– Apply protection of an observatory• IUCAF – more science aspects• OtherOth WP
WPs – liasonliththroughh WP7D• Active service for sharing study
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Passive only (5.340)(5 340)2016/12/20

ALMA/NRO/ASTE Users Meeting7WRC (freq allocation)• WRC‐2015– 77.5 – 78.0 GHz for automotive radar• WRC‐2019 (agenda items)– IMT:IMT 2424.25‐27.5,
25 27 5 37‐40.5,
37 40 5 42
42.5‐43.5,
5 43 5 45.5‐47,
45 5 47 47.2‐
47 250.2, 50.4‐ 52.6, 66‐76 and 81‐86, 31.8‐33.4, 40.5‐
42 5 4742.5,
47.2‐50.2
2 50 2 GHz
GH– Satellite: 17.7‐19.7, 37.5‐39.5, 39.5‐42.5 (dl), 27.5‐
29.5, 47.2‐50.2, 50.4‐51.4 (ul)– Misc. 275‐450 GHz
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ALMA/NRO/ASTE Users Meeting8New Discovery
Automotive（76 GHz）

TA* ~ 18 K

76‐81 GHz allocated primary

TA*F ll i bands
Followingb d on th
the didiscussion
i ttable
bl ini WRC‐2019
WRC 2019

2016/7/20

Frequency Management

9Summary• Various issues are going in recent years mostly
pushingg tobecause active service have been phigh frequencies (supported by admin).
• WRC‐2019
WRC 2019 deals with issues potentially killingsome of Mizusawa and Nobeyama
observatories.
b• Check with our URL (to be updated) or contact
us if you come across any interference issues.
http://radio.mtk.nao.ac.jp/freqras/
2016/12/20

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