A 10-GHz Code-Modulated Interferometric Imager Using Commercial-Off-The-Shelf Phased Arrays

Code-modulated interferometric imaging is a lens-less approach to imaging in which existing analog phased-arrays are repurposed as an interferometer using code modulation. A 33-pixel, eight-element prototype is created using two commercially-available ADAR1000 phased-array receivers from Analog Devices Inc. The chips are connected at board level to a patch antenna array. The serial interface is used to apply codes whereas the on-chip power detector and data converter are used for direct read out of the composite code-multiplexed imaging data. These are then processed off-line in Matlab to reconstruct the image. The 33-pixel camera is demonstrated in hardware for point-source detection.