The time-modulated approach described in the paper expands on our previous work, in which it was demonstrated that alternating a real-time beamformer between multiple sets of weights can multiplex several different beams (acquisition and one or more sidelobe suppression) within the beamformer output for the same computational cost as a single beamformer. Alternating the weights based on pseudo-random codes implements a CDMA-like scheme, which exploits the frequency-domain sparsity of the received signals. Further, using a single SLS beam minimizes the impact on the resultant detection SNR, but our previous work showed that this also introduces challenges when the underlying array is spatially sparse.
The present work reported here will describe cost/performance tradeoffs of this technique when the number of auxiliary beams is changed; increasing this quantity will increase the probability of detection of RFI, but also will decrease the SNR (and PD) of weak target signals. This approach is compressive in the beam-space domain.