[alma-config] Sidelobe level

morita morita at nro.nao.ac.jp
Mon Jun 19 18:15:54 EDT 2000


Hi all,

sorry for my long absence.
As Mark pointed out, my evaluation of the near sidelobe level for the
SPIRAL array was wrong.  I set radial range of [1xFWHM, 10xFWHM]
as near sidelobe area.  This minimum radius is too small for
the SPIRAL array and I took a main beam wing as the peak sidelobe
level.  I re-evaluate the near sidelobe level over the radial range 
of [2xFWHM, 10xFWHM] for the SPIRAL array.  Following table shows
revised results.


+-----------------------------------------------------------------------+
  Array         HA range        Near Sidelobe (%)       Far Sidelobe (%)
                (hour)          peak    rms             peak    rms
+-----------------------------------------------------------------------+
  SPIRAL        [0.0, 0.1]       6.53    1.25           13.48    1.56
  RING          [0.0, 0.1]      17.61    2.85           13.56    1.36

  SPIRAL        [0.0, 1.0]       5.37    1.10            8.49    0.90
  RING          [0.0, 1.0]      17.34    2.83            6.56    0.89

  SPIRAL        [-3.0, 3.0]      2.12    0.60            2.30    0.38
  RING          [-3.0, 3.0]     16.75    2.60            2.71    0.59
+-----------------------------------------------------------------------+

Regards,

Koh-Ichiro



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