Terahertz(THz) Impulse Imaging has many applications in security and nondestructive testing.Sparse THz arrays can dramatically reduce array complexity for imaging applications requiring a large field of view.Sparse arrays employing narrow band waves suffer from gratin lobe artifacts that severely degrade image quality.However, the short coherence length of single-cycle THz pulses provides an opportunity to overcome this limitation.Grating lobe artifacts can be suppressed with an adaptive weighting factor based on temporal coherence of signals from neighboring array elements.The spatial...