JAXA の新しい 54m 地上局の建設と VLBI 観測の状況 Status of JAXA’s new 54m deep space station and VLBI observation 2 nd December, 2018 GREAT Project Team （ GRound station for deep space Exploration And Telecommunication) K.Numata （ PM), Y. Hasegawa, F.Nonaka, S.Nakahara, T.Ohnishi, S.Sekikawa, G.Tabuchi, T.Toda, A.Tomiki, M.Tsuboi, T.Uchimura, K.Yuchi, & YM Institute of Space and Astronautical Science (ISAS) ） Japan Aerospace Exploration Agency (JAXA) Presented by Y. Murata (JAXA) http://www.isas.jaxa.jp/home/great
The view of the 54m antenna (1/2) Design shown in the previous meeting. 1
The view of the 54m antenna now (2/2) Misasa Ground Station 美笹地上局 • 2018/11/27 status • Close to finish antenna structure construction. 2 surface and sun-shade panels, snow cover for Az rail.
Purpose of new Deep space antenna 64 m deep space antenna is too old to support reliable deep space missions, though it works well now. Capability to support HAYABUSA-2 and MMO (Mercury Mission, BepiColombo) which are designed to use 64m antenna. Newer deep space mission can be designed based on new antenna specification. Most of mission requirements come from HAYABUSA-2 and MMO Other missions (future missions, near earth missions, radio astronomy etc) have secondary priority.) Capability to support X(8.4GHz)- and Ka(32GHz) - deep space downlink bands. Support X(7.2 GHz) deep space uplink Antenna diameter 54m is designed to support current 64m capability (Gain, G/T etc ) with minimum cost. 3
Location 54m 64m 45m 4 6km=3.75mile
Location 5 10m
Updates アンテナ建設・運用試験棟および周辺設備はほぼ予定通り進んでおり、ア ンテナの形としては 12 月に完成し、これからアンテナ内の設備の組み込み 立ち上げが始まる。 10 月に行われた審査により送信機の増幅器をクライストロン移設から固体 半導体増幅器（ SSPA ）にするという計画変更が認められた。 DDOR 観測（相対 VLBI を利用した精密軌道決定）、測地観測に使用する VLBI バックエンド（ Downconverters, ADS-3000+, recording PC) が 2017 年度 に納入された。現在 64m アンテナに接続して試験を行っている。 X-band, Ka-band LNA ( 天文の世界では受信機）の製作終了 X 帯外来波対策 （ RF 入力 8200-8700 MHz → 8350 – 8550 MHz のフィルター開発中 ) 54m の立ち上げ測定の準備。 64m アンテナを利用したアンテナ測定の実験 メーザー天体を利用した指向精度測定の準備 22 GHz 受信機搭載の検討 （関西学院大、筑波大、大阪府立大との協力） ホログラフィーによるアンテナ鏡面測定の検討 6 2019 年度後半より天体受信は可能となる。 VLBI 実験を行う。
Block Diagram of The Station System The new station should be available to use the existing sataion function. New Station UDSC Station LAN Station Inside Antenna Building Controller LAN Antenna Subsystem X-Band TX IF to X-Band X-Band RF I/F U/C HPA Monitor & Antenna Controller X- & Ka-Band LNA TX/RX Subsystem Calibration X-Band RX X-Band to IF X-Band X/Ka-Band TLM RF I/F D/C LNA MODEM Processing Drive Feeder CMD Ka-Band Ka-Band RX Ka-Band to Processing Building Monitor & LNA RF I/F X-Band D/C Controller Station Controller Open Loop Calibration Signal Foundation Recording To LNAs Store & To Subsystems To Subsystems Time & Infrastructure Distribution Frequency Monitor & Shared with UDSC Controller Operational Others Reuse of UDSC LAN#1 Support Tools LAN#2 Subsystem Boundary Inside Operation Support Building IP-VPN 7 Station Station LAN(TKSC) LAN(SSOC)
Open-loop system ( オープンループ記録装置） ~ VLBI backend and calibration system Ref. Distrib uter X D/C High Speed A/D (ADS- 3000+) Ka D/C 54m station needs VLBI observation for the decision of the location of the station and DDOR observation (Delta Differential One-way Ranging), and Openloop system will be installed. 8
64m アンテナ 1F 10
64m 運用室 11
54m VLBI observation X-band: J-Net frequency is available: 8.2-8.7 GHz => 8.35 – 8.55 Ka-band is also possible but no counterpart except for DSN stations in NASA and ESA Extension ports: It depends on the design in future at 19 – 43 GHz? Discussion for importing 22 GHz system which was installed Tsukuba 32m with Kansei-gakuin Univ., Tsukuba Univ, and Osaka-pref. Univ. Geodesy Geodesy observation of 54m ➢ Requirement : ± 3cm rms ➢ No S-band, No VGOS receiver ➢ X/Ka Geodesy with NASA and ESA stations Only deep space stations have receivers for X/Ka simultaneous observation. ➢ Back up plan: Co-observation with Usuda 64m and other S/X geodesy stations, and use 64m ionosphere data for 54m Astronomy ? 12
On-site status (2018/1/31) 13
On-site status (2018/2/2) 14
On-site status (2018/3/15) 15
On-site status (2018/4/11) 16
On-site status (2018/5/16) 17
On-site status (2018/6/6) 18
On-site status (2018/7/13) 19
On-site status (2018/8/1) 20
Main reflector (MR) block construction (2018/8/11) 21
On-site status (2018/9/12) 22
Connection of MR block (2018/9/19) 23
On-site status (2018/9/24) 24
On-site status (2018/10/3) 25
On-site status (2018/10/28) 26
On-site status (November 17, 2018) Tateshina Skyline 27
On-site status (November 17, 2018) Seeing Monitor #1 Weather monitor Tateshina Skyline North Bunkhouse ( 仮設建屋） Operation Building ( 運用試験棟） Power Supply Radio Meter Building ( 電力棟） Seeing Monitor #2 GPS-antenna 28
On-site status (2018/11/18) 29
On-site status (November 29, 2018) Tateshina Skyline 30
On-site status (November 29, 2018) 31
On-site status (November 29, 2018) Tateshina Skyline 32
まとめ JAXA new 54m antenna project is on going with updates, ➢ Antenna Construction ➢ Manufacture instruments ➢ VLBI backend is installed at Usuda 64m ➢ Change of X-band bandwidth VLBI technology is one of key development. ➢ DDOR observation for accurate navigation in deep space missions ➢ Geodesy observation to get accurate position of antenna Thank you for collaborating the project. 大阪府立大、関西学院大 / 筑波大、法政大、 NICT 、国土地理院、国立天文台 その他メーカー研究者の方々。 33
GREAT Misasa Antenna 34
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