Time-domain method for DOA estimation of LFM signals based on block-sparsity recovery

Under the current array system, a new method for wideband LFM signal Direction-of-Arrival (DOA) estimation is proposed, without restriction to the Shannon-Nyquist sampling theorem as like as the frequency-domain techniques. The key point of this method is to use the blocksparsity of several time source signals to build a blocksparse model for the array receiving several snapshots, then the DOA estimation problem of LFM signals can be reformatted as a block-sparsity recovery problem which can be solved by various algorithms. The experimental results demonstrate the superior estimation performance of the proposed method.