In this letter, we apply previous array receiver architecture which employstime-domain sub-Nyquist sampling techniques to jointly estimate frequency anddirection-of-arrival(DOA) of narrowband far-field signals. Herein, a moregeneral situation is taken into consideration, where there may be more than onesignal in a subband. We build time-space union model, analyze theidentification of the model, and give the maximum signal number which can beclassified. We also proof that the Cramer-Rao Bound (CRB) is lower than that ofwhich employs Nyquist sampling. Simulation results verify the capacity toestimate the number of sources. Meanwhile, simulations show that our estimationperformance closely matches the CRB and is superior for more sources thansensors, especially when the minimum redundancy array (MRA) is employed.
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