| Issue |
A&A
Volume 510, February 2010
|
|
|---|---|---|
| Article Number | A15 | |
| Number of page(s) | 6 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361/200913412 | |
| Published online | 29 January 2010 | |
The self-cohering tied-array
ASTRON, Oudehoogeveensedijk 4, Dwingeloo, 7991PD, The Netherlands e-mail: fridman@astron.nl
Received:
6
October
2009
Accepted:
26
November
2009
Context. Large radio astronomy multi-element interferometers are frequently used as single dishes in a tied-array mode when signals from separate antennas are added. Phase shifts arising during wave propagation through a turbulent atmosphere can significantly reduce the effective area of an equivalent single dish.
Aims. I aim to give estimates of the impact of the ionosphere and troposphere on the effectiveness of a radio interferometer working in tied-array mode.
Methods. Statistical estimates of the effective area are calculated and the power-law of turbulent atmosphere irregularities has been used. A simple method of tied-array calibration using optimization techniques is proposed.
Results. The impact of phase errors on the effectiveness of tied-arrays are given for low and high frequencies. Computer simulations demonstrate the efficacy of the proposed calibration algorithm.
Key words: instrumentation: interferometers / methods: data analysis / methods: statistical
© ESO, 2010
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