Patent ID: 8947294
Filing Date: 2015-02-03
Classification: G01S,H01Q

Abstract:
1. A method for reducing sidelobe clutter or electromagnetic interference (EMI) in a radar system comprising: receiving complex subarray I/Q data samples from a plurality of subarrays of a ground based digital beamforming radar antenna, the subarray I/Q samples representing a radar signal containing near-horizon clutter or EMI; coherently integrating in at least one processor, the received I/Q data samples to increase the CNR or ENR of the I/Q data samples; selecting in the at least one processor, range cells containing the increased CNR or ENR samples over a target range extent associated with the range of the received clutter or EMI to be cancelled; adaptively modifying in the at least one processor, beam steering weights using said selected range cells to generate a modified beam steering vector; processing in a digital beamformer, complex subarray I/Q samples using the modified beam steering vector to form a spatial sidelobe null in the direction of the received clutter or EMI.