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IVS VLBI 2010 Workshop on
Future Radio Frequencies and Feeds
Wettzell / Hoellenstein (Germany),
March 18 - 20, 2009
Development of a Compact VLBI System for
Providing over 10-km Providing over 10-km Baseline Calibration
Ishii A.(1),(2),(3), ICHIKAWA R.(1), Takiguchi H.(1),
Kuboki H. (1), Kimura M. (1), Nakajima J. (1), Koyama
Y. (1), Kondo T. (1), Machida M. (2), Kurihara S. (2), Y. (1), Kondo T. (1), Machida M. (2), Kurihara S. (2),
Kokado K. (2), and Matsuzaka S. (2)
(1) Kashima Space Research Center, NICT(2) Geographical Survey Institute
(3) Advanced Engineering Services Co.,Ltd.
Contents
• Objective
•• Observation Concept
• First Prototype of Compact
VLBI System
• First VLBI Experiments
2/20
• First VLBI Experiments
• Second Prototype
• Summary & Outlook
First Objective:First Objective:
Baseline Calibration
for GPS and EDM
SurveySurvey
Rover VLBI measurements are also available.
GSI Baseline Calibration Site
ReferenceReferenceBaseline(~10 km)
Tsukuba City
GSI
Observation
Concept
Station R(Large Antenna)
Correlation Processingis performed
No Correlation Processing
Calibration Baseline(~10 km)
Station YStation X
GPSVLBIGPS
VLBI
RX
XY
RY
Station Y(Compact Antenna)
Station X(Compact Antenna)
XY = RY - RX
Multiple Antenna Radio-interferometry
Baseline Length Evaluation
of
MARBLE
M A
B L E
R
MARBLESystem
Development
ofof
MARBLE
CompactCompact
VLBI System
Specifications of MARBLE
Compact VLBI Antenna
• Diameter: 1.5 – 1.8 m• Diameter: 1.5 – 1.8 m
• Feed Location: Primary Focus
• Mount: AZ/EL
• AZ/EL Slew Speed: > 5deg/sec
9/20
• AZ/EL Slew Speed: > 5deg/sec
• Transportability: The system is designed to be assembled with
muscle power.
Transportability of
MARBLE Compact VLBI
System
VLBI measurement
AZEL
Dish
AZELACU
DC
GPS measurement
Pillar
AZ
ACU
DCAZELACU
Prototype of Prototype of
MARBLE
Compact AntennaCompact Antenna
First Prototype
First Prototype (cont’d)
First Prototype (Front end)
Band-width of LNA1-11GHz
Feed: Quad-ridge Horn
Antenna [QRHA]
• ETS/LINDGREN 3164-05• ETS/LINDGREN 3164-05
• 2 GHz - 18 GHz Frequency Range
• Dual linear polarized
• weight: 0.7 kg
15/20
• weight: 0.7 kg
• size: 17.1 X 17.1 X 18.6 [cm]
Anechoic Chamber Test
S-band
X-band
First Fringe DetectionFeb. 12, 2009
ACUFS9
X-band
S-bandACU S-band
Fringe detection using ADS3000+ was also successful.
Second Prototype
•Dish Diameter: 1.5m•F/D: 0.49 (1 : •F/D: 0.49 (1st:
0.45)•Light Weight•100V AC power
1.5m
•100V AC power• The first prototype
needs 200V power supply.
Summary of
Present Status
• First Prototype is now available.• First Fringe Detection was performed
successfully on Feb. 12, 2009.•• Second Prototype is under development.
Outlook
• Second Prototype will be installed in GSI, • Second Prototype will be installed in GSI, Tsukuba.
• Geodetic VLBI Experiments using 1st and 2nd Prototypes are planned in the next fiscal year.
•next fiscal year.
• MARBLE Concept is under evaluation.• Local tie experiment is planned.