Gratinglobes Resolving in Sparse Array Beamformning

Beamforming in sparse array often results in gratinglobes because of spatial undersample. In this paper, we investigate the concept of effective aperture to resolve gratinglobes. The central idea of effective aperture is to use transmit aperture with an appropriate element number to eliminate undersample in receive aperture. Quantitative analyze shows that the element number of transmit aperture is proportional to the inter-spacing of receive sparse array. Simulations demonstrate the design method can resolve gratinglobes effectively