Efficient Subarray Realization through Layering
- J. O. Coleman, K. R. McPhail, P. E. Cahill, and D. P. Scholnik
In many "digital" planar receive arrays proposed
today element outputs are not digitized directly.
Instead, the outputs of a lesser number of overlapped
identical analog subarrays are digitized. Here the
severe cost/performance tradeoff usually encountered
when choosing subarray sizes and overlaps is
dramatically improved by replacing the usual single
layer of analog subarray processing with multiple
layers of subarray processing, each further reducing
the spatial density of signal outputs to be processed.
The set of signals digitized can be made quite sparse
while realizing most of the required large subarray
overlap in the low-cost intermediate layers. Here we
develop the theory and present a major design example
in which the cost/performance tradeoff is improved a
full order of magnitude by one key measure. We
discuss receive arrays, but the ideas apply to
transmit arrays as well.
- DOWNLOADABLE PREPRINT:
PDF (2.6 Mbytes),
- Presented to the Antenna
Applications Symposium, Robert Allerton Park, Monticello
IL, USA, Sep. 21-23, 2005.
- DATE OF ENTRY:
August 2005. Updated November 2005.