and VLBI observation 2 nd December, 2018 GREAT Project Team GRound - - PowerPoint PPT Presentation

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

2nd December, 2018

） Presented by Y. Murata (JAXA) http://www.isas.jaxa.jp/home/great

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)

The view of the 54m antenna (1/2)

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Design shown in the previous meeting.

The view of the 54m antenna now (2/2)

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• 2018/11/27 status
• Close to finish antenna structure construction.

surface and sun-shade panels, snow cover for Az rail. Misasa Ground Station 美笹地上局

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.

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Location

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54m 64m 45m

6km=3.75mile

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10m

Location

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

 2019年度後半より天体受信は可能となる。VLBI実験を行う。

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Block Diagram of The Station System

 The new station should be available to use the existing sataion function.

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To Subsystems

Antenna

Feeder Building X-Band LNA X-Band HPA IF to X-Band U/C X-Band RX RF I/F Ka-Band LNA Controller Store & Distribution Time & Frequency To Subsystems ฀ Reuse of UDSC ฀ Subsystem Boundary ฀ Shared with UDSC Calibration Ka-Band RX RF I/F X-Band to IF D/C

New Station UDSC

TLM Processing CMD Processing Station LAN LAN#1 LAN#2 Station Controller IP-VPN Ka-Band to X-Band D/C X/Ka-Band MODEM X-Band TX RF I/F Antenna Subsystem TX/RX Subsystem X- & Ka-Band LNA Others Monitor & Controller Monitor & Controller Infrastructure Foundation Station LAN Inside Antenna Building Operational Support Tools Monitor & Controller Inside Operation Support Building Drive Open Loop Recording Calibration Signal To LNAs Station LAN(TKSC) Station LAN(SSOC)

Open-loop system (オープンループ記録装置） ~ VLBI backend and calibration system

54m station needs VLBI observation for the decision of the location of the station and DDOR

• bservation (Delta Differential One-way Ranging), and Openloop system will be installed.

8 Ref. Distrib uter Ka D/C X D/C High Speed A/D (ADS- 3000+)

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64m アンテナ 1F

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64m 運用室

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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

• bservation.

➢ Back up plan: Co-observation with Usuda 64m and other S/X geodesy stations, and use 64m ionosphere data for 54m  Astronomy ?

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On-site status (2018/1/31)

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On-site status (2018/2/2)

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On-site status (2018/3/15)

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On-site status (2018/4/11)

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On-site status (2018/5/16)

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On-site status (2018/6/6)

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On-site status (2018/7/13)

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On-site status (2018/8/1)

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Main reflector (MR) block construction (2018/8/11)

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On-site status (2018/9/12)

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Connection of MR block (2018/9/19)

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On-site status (2018/9/24)

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On-site status (2018/10/3)

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On-site status (2018/10/28)

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On-site status (November 17, 2018)

Tateshina Skyline

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On-site status (November 17, 2018)

Tateshina Skyline GPS-antenna Power Supply Building (電力棟） Operation Building (運用試験棟） Radio Meter Weather monitor Seeing Monitor #1 Seeing Monitor #2 Bunkhouse (仮設建屋） North

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On-site status (2018/11/18)

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On-site status (November 29, 2018)

Tateshina Skyline

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On-site status (November 29, 2018)

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On-site status (November 29, 2018)

Tateshina Skyline

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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。

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GREAT Misasa Antenna