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This paper presents experimental results using time modulation to implement inexpensive sidelobe blanking. The Allen Telescope Array is used to save time-series data for the L-band hydroxyl maser W3(OH), which presents a narrow-band source among significant narrow-band interference. A software beamformer processing these data rapidly switches between antenna weights composed of the sum and difference...
Time modulation is explored as a tool for inexpensive sidelobe blanking in a digital beamformer. Rapid switching of the steering coefficients encodes acquisition and sidelobe suppression beams within a single output during beamforming so that they are separable by a synchronized decoder. The computational cost is the same as traditional beamforming, making this method advantageous versus other sidelobe...
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