Front-End Integration Requirements for the Square Kilometre Array Radio Telescope

2010 ◽  
Author(s):  
J. G. Bij de Vaate ◽  
R. H. Witvers ◽  
E. E. M. Woestenburg
Keyword(s):  
Radio Telescope ◽  
Square Kilometre Array ◽  
Front End

scholarly journals The multi frequency front end: a new type of front end for the Westerbork Synthesis Radio Telescope

1991 ◽  
Vol 131 ◽  
pp. 42-46
Author(s):  
G.H. Tan
Keyword(s):  
Radio Telescope ◽  
Local Oscillator ◽  
Frequency Bands ◽  
Front End ◽  
New Type

AbstractThe Westerbork Synthesis Radio Telescope will be equipped with new front ends. These front ends will cover 8 frequency bands in the range from 250 MHz to 8.6 GHz. For the frequency bands above 1.2 GHz the sensitivity of the instrument will be drastically improved. Two independent local oscillator systems make it possible to observe in two frequency bands simultaneously.

Development of a pilot of an Arecibo-type large spherical radio telescope for the square kilometre array

2001 ◽  
Vol 215 (11) ◽  
pp. 1321-1329 ◽  
Author(s):  
Y X Su ◽  
B Y Duan ◽  
R D Nan ◽  
B Peng
Keyword(s):  
Radio Telescope ◽  
Control Method ◽  
Parallel Manipulators ◽  
Approximate Model ◽  
Fine Tuning ◽  
Tracking Accuracy ◽  
Square Kilometre Array ◽  
Supporting System ◽  
Design Project ◽  
Large Spherical

An optomechatronics design project for the pilot of an Arecibo-type large spherical radio telescope for the square kilometre array (SKA) is proposed, concentrating on the feed-supporting system with large-span cables. The feed-supporting system consists of two parallel manipulators: the parallel cable manipulator, which provides a large workspace for the trajectory tracking and realizes the coarse tracking control, and the fine-tuning Stewart platform, which connects the parallel cable manipulator to the cabin structure and implements the high-accuracy requirement of tracking. In order to improve the real-time controllability, an approximate kinematics model of the parallel cable manipulator is developed using straight links to approximate the cables based on static equilibrium at low tracking velocity. A control strategy for the feed-supporting system is proposed using the independent control method, and the corresponding tracking accuracy of the coarse control and fine tuning is presented. The simulation results have supported the rationale of this approximate model of the parallel cable manipulator and the feasibility of this mechatronics design project for the SKA.

scholarly journals Pulsar timing at Kalyazin (Russia)

2000 ◽  
Vol 177 ◽  
pp. 57-60
Author(s):  
O.V. Doroshenko ◽  
Yu.P. Ilyasov ◽  
V.V. Oreshko
Keyword(s):  
General Relativity ◽  
Local Time ◽  
Radio Telescope ◽  
Orthogonal Polarization ◽  
Hydrogen Maser ◽  
Radio Pulsars ◽  
Time Service ◽  
Binary Pulsars ◽  
Front End ◽  
Pulsar Timing

AbstractRegular timing observations of millisecond and binary pulsars are made with the 64-m radio telescope at Kalyazin (Russia). Filterbank 160-channel receiver is used for observations at 0.6 GHz in two circular orthogonal polarization. Precise local time service (based upon a rubidium standards and hydrogen maser) is used for measurements of Times-of-Arrival (TOA) from radio pulsars. A local time scale is compared by GPS and TV-systems with the basic AT-scales (UTC(USNO) and UTC(SU)) within an accuracy about 50nsper day. Recently the second 1.4 GHz receiver (250 kHz × 64 channels) was constructed and installed at Kalyazin radio telescope. There is a possibility to combine a part of the 1.4 GHz back-end with the 2.2 GHz front-end to produce timing observations at three frequencies simultaneously. We present a results of precise timing observations conducted by the Kalyazin pulsar system. Most of data were obtained at 0.6 GHz in 1997–1999. The data will be used for valuable applications in fundamental metrology, interstellar medium, general relativity and pulsar physics itself.

scholarly journals A New 100-GHz Band Front-End System with a Waveguide-Type Dual-Polarization Sideband-Separating SIS Receiver for the NRO 45-m Radio Telescope

2008 ◽  
Vol 60 (3) ◽  
pp. 435-443 ◽  
Author(s):  
Taku Nakajima ◽  
Takeshi Sakai ◽  
Shin’ichiro Asayama ◽  
Kimihiro Kimura ◽  
Masayuki Kawamura ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Dual Polarization ◽  
Sis Receiver ◽  
Front End ◽  
Waveguide Type ◽  
Band Front

scholarly journals RapidXfer - data transfer framework for square kilometre array

2021 ◽  
Author(s):  
Priyaa Thavasimani
Keyword(s):  
Comparative Study ◽  
Data Management ◽  
Radio Telescope ◽  
Data Transfer ◽  
Grid Data ◽  
Square Kilometre Array ◽  
Advantages And Disadvantages ◽  
End To End

AbstractData Management of Astronomy Data is often a laborious task and it is even more challenging for the extraordinary amounts of data expected from the world’s largest radio telescope, Square Kilometre Array. There are overt issues in transferring the voluminous data and the traditional data transfer methods are fragile especially for the data transfer between two continents. To address this, a new data transfer framework is proposed and the data transfer is achieved using two steps: international and local transfers. The efficiency of different end-to-end data transfer tools used in is evaluated on different dataset sizes. Further, a comparative study of two IRIS grid data transfer methods is made to understand each methods’ advantages and disadvantages. This study can be used as a reference for the development of future SKA’s data transfer operations.

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