Recent Activity of the Radio Frequency Management Committee
最近の電波天文周波数小委員会の活動
ALMA/45m/ASTE Users Meeting 2017 Dec. 26-27, 2017
Mareki HONMA, Osamu KAMEYA, Yasuo TAKEBAYASHI, and Junko TSUNEYAMA (the radio frequency management committee, NAOJ)
本間希樹, 亀谷 收 , 竹林康雄, 常山順子 (国立天文台電波天文周波数小委員会）

the radio frequency management committee

A situation surrounding radio astronomy

電波天文周波数小委員会

See: http://radio.mtk.nao.ac.jp/freqras/index.html for details

Coexistence study of radio astronomy with other services

・ 2-30MHz etc. PLC
The Purpose
・ 1.6GHz Satellite mobile phone system
In order to maintain the radio astronomical observation environment,
・ 3-10GHz UWB
we consult and investigate with related agencies in Japan and overseas,・21GHzBroadcastsatellite,
Communication
satellite
and protect radio astronomical observation frequency band from・23GHzCATV,
wirelesstransmission,Communication
satellite
interferences.
・ 76GHz Automotive Radar
・ 79GHz Automotive Radar
The Committee members
・ >125GHz Future use examination
Chairman: Mareki Honma, Vice Chairman: Osamu Kameya,
Secretary General: Yasuo Takebayashi, Secretariat: Junko Tsuneyama
・ Drone, Power transmission, etc.
The committee members consist of 17 members including the above members,＊In the future, new items to be further investigated will increase.
directors of the National Astronomical Observatory of Radio Observatory＊Inrecentyears,
theenvironment
surroundingradio
astronomy(Mizusawa and Nobeyama), Director of the Radio communication Division,
has become severe.
representatives of the radio astronomical community intention both inside andoutside the National Astronomical Observatory of Japan.
＊We collect data from domestic radio astronomy stations and are
doing protection and appeal.
Activity· Regular meetings several times a year.
· Since the Ministry of Internal Affairs and Communications is theagency of frequency allocation, we state allocation of radio wave
(radio wave radiation) as a representative of radio astronomy.
·We participate in conferences organized by ITU-R (InternationalTelecommunication Union) and their preparatory meetings in Japan.

Frequency Bands for Radio Astronomy
Frequency allocation footnote J107 of the Ministry of Internal Affairs
and Communications ( for protection of Radio Astronomy）prohibits
emitting all radio waves in the following frequency bands.

Frequency band（GHz) Main lines and foot notes
1.4-1.427
HI
2.69-2.7
15.35-15.4
23.6-24.0
NH3 23.694 GHz, 23.723 GHz, 23.870 GHz
31.3-31.5
86.0-92.0
SiO 86.243 GHz, HCN 88.632 GHz
100.0-102.0
1813
109.5-111.8
C O 109.782 GHz, CO 110.201 GHz
114.25-116.0
CO115.271
GHz
情報の修正を提案
148.5-151.5
164.0-167.0
182.0-185.0
H2O 183.310 GHz
190.0-191.8
200.0-209.0
226.0-231.5
CO 230.538 GHz
250.0-252.0

References
1. 齋藤、亀谷、立澤、岡保、齋藤『電波天文学を守るために』2015天文月報108,599（Japanese）
2. HP of frequency usage of of the Ministry of Internal Affairsand Communications
http://www.tele.soumu.go.jp/j/adm/freq/search/share/plan.htm
3. Provisional Final Acts WRC-15
http://www.itu.int/dms_pub/itu-r/opb/act/R-ACT-WRC.112015-PDF-E.pdf

Activities at ITU-R (International Telecommunication Union)
The ITU-R（国際電気通信連合:International TelecommunicationUnion) holds a global radio communication conference in Geneva,
Switzerland once every three to four years, deciding the agreementon radio wave use and future consideration.
Last time: WRC - 15 (held in 2015) For the conclusion, see thefollowing URL:
http://www.soumu.go.jp/menu_news/s-news/01kiban10_02000018.html
Next time: WRC-19 (to be held in 2019) Currently, various considerations are being
conducted domestically and abroad for international agreement there.

Figure1：WRC-15 conference（3,800 people from 162 countries）
Main agenda of the World Radio Communication
Conference (WRC-19)
AgendaFrequency coverage （GHz）

International mobile phone

24.25-27.5, 37-40.5, 42.5-43.5, 45.5-47,
47.2-50.2, 50.4- 52.6, 66-76 and 81-86
31.8-33.4, 40.5-42.5, 47.2-50.2

Operation system

5.725-2.825

Non-geostationary orbital satellite Space->Earth 17.7-19.7,
service37.5-39.5, 39.5-42.5
Earth->Space 27.5-29.5,
47.2-50.2, 50.4-51.4
Coexistence of Radio Astronomy> 70
and the other services
Usage and technical side of275-450
scientific services
Wireless access

5.15-5.925

Wireless power transmission

80－90, 500kHz, 7MHz