Download or read book Passive Synthetic Aperture Array Imaging at Millimeter Wave Frequencies Using Novel Electro-optical Detection and Processing written by and published by . This book was released on 2006 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this effort we have designed, fabricated, and demonstrated a one-dimensional synthetic aperture imaging system for the passive imaging of millimeter waves (MMWs) using optical upconversion and correlation techniques. The advantage of this approach over alternate techniques is that the proposed system does not require expensive high-speed electronic detection and read out circuits and it is light enough to be used on UAV platforms. This technique eliminates the need for a lens and can provide high resolution at mm wavelengths by extending the baseline of the antenna array. We developed a novel optical feedback technique that allows us to lock the phase of each optical carrier with a coherent reference beam. We have demonstrated the feasibility of the technology by building a linear, four element sparse aperture antenna array capable of imaging at mm wavelengths using commercial, off-the-shelf telecommunications components. The system was used to image a 35 0Hz plane wave and demonstrated near diffraction limited resolution.