Patent ID: 8115679

Claim:
A method to suppress side lobes of a main antenna using a side lobe canceller (SLC), the SLC comprising an auxiliary antenna and an Adaptive Side lobe Canceller control unit (ASC), the auxiliary antenna having N antenna elements, where the antenna element may also be a sub array, 1 to N, N being ≧1, and a feedback loop from an output terminal of the SLC to the ASC, the method comprising: using the ASC, receiving a main antenna output waveform from the main antenna; using the ASC, receiving auxiliary antenna output waveforms s 1 to s N from the respective antenna elements or sub arrays of the auxiliary antenna; transforming the auxiliary antenna output waveforms using respective transforming units Tr 1 to Tr N to provide transformed auxiliary antenna output waveforms; delaying the main antenna output waveform to provide a delayed output waveform of the main antenna; and calculating a respective weighting function W(ω) for Q spectral components indexed by an integer q ranging from 0 to Q−1, the Q spectral components obtained via dividing a bandwidth B into Q components for each antenna element or sub array, the respective weighting function W(ω) calculated using a criterion to minimize a jamming influence on a side-lobe-suppressed main antenna output waveform from the SLC; and wherein the transforming the auxiliary antenna output waveforms includes using one or more control parameters calculated from the respective weighting function W(ω) at discrete angular frequencies ω q using the ASC; and wherein, using the ASC, the one or more control parameters are calculated on a recurring basis and provided via respective control signals c 1 to C N for use in transforming the auxiliary antenna output waveforms; and wherein the method includes subtracting the transformed auxiliary antenna output waveforms in the time or frequency domain from the delayed output waveform of the main antenna to provide the side-lobe-suppressed main antenna output waveform from the SLC having reduced jamming influence over the bandwidth B.