Multitarget Direct Localization Using Block Sparse Bayesian Learning in Distributed MIMO Radar

Figure 1

The spatial sparsity of the targets inside the area is illustrated through discretization of the area into a grid of cells. The targets occupy only two cells marked as and . Hence, the spatial representation of the target reflection coefficients is sparse. We can see that support of exhibits the block sparsity structure as there are only two blocks of nonzero elements corresponding to the two targets. The size of each block is the number of transmit-receive pairs.