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MMA Memo #217

A, B, C, and D configurations in the shape of concentric circles

L. Kogan

June 24, 1998

Keywords: Configurations, Infrastructure, uv coverage

Optimization of an array configuration with a donut constraint [2] showed that the elements tend to group near the donut's circumferences. This fact pushed me to investigate the optimization with two circle constraint. The two circle configuration has an obvious advantage with regard to maintenance. To minimize the number of circles for the A, B, and C configurations, I selected the inner circle of the A configuration as the outer circle of the B configuration, the inner circle of the B configuration as outer circle of the C configuration. The D configuration was optimized only with the constraint of minimum spacing, having its outer circle as inner circle of the C configuration. The calculation has been carried out for the A configuration size of 3000m, the B configuration size of 840m, the C configuration size of 240m, and the D configuration size of 96m. The minimum spacing was set at the 12.8m and the number of antennas was set at 36. The optimization has been provided inside the circle at the sky with diameter 40 synthesize beams. For all four optimal configurations the worst side lobe was around 0.1 which was close to the optimal value I had obtained without any constraints. For D configuration, the optimization of the side lobes at the level is at the whole sky, if we take into account the primary beam consideration.


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Last modified: 09 December, 1999

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