The Use of Overlapped Subarray Techniques in Simultaneous Receive Beam Linear Arrays
ELECTRONICS RESEARCH LAB ADELAIDE (AUSTRALIA)
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A linear array of antennas connected to an appropriate beam-forming matrix or having outputs processed digitally to yield a spatial Fourier analysis allows great flexibility for multiple-beam reception in a HF radar. However, for large numbers of elements the cost becomes unmanageable. Subarraying the elements reduces the degrees of freedom and hence the cost but introduces difficulties with grating lobe effects. A design approach is developed which uses steerable subarrays whose outputs are used to develop multiple simultaneous beams lying within the envelope of the subarray pattern. The combination of amplitude taper within the subarrays and overlap o the subarrays can be used in a systematic way to realise simultaneous beams having an equiripple sidelobe structure of specified level below the beam maximum. A design process is developed and illustrated by typical applications.
- Active and Passive Radar Detection and Equipment