Patent ID: 8115679
Filing Date: 2012-02-14
Classification: G01S,H01Q

Abstract:
1. 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 transforming the auxiliary antenna output waveforms using respective transforming units Tr 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 wherein, using the ASC, the one or more control parameters are calculated on a recurring basis and provided via respective control signals c 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.