| Synthetic Aperture Radars (SAR) generate high resolution two-dimensional reflectivity maps versus azimuth and range. Polge, Mahafza, and Kim (31-33) developed a new theory for the operation of real arrays in the sequential mode. This dissertation extends the theory of sequential mode operation to rectangular arrays. It follows that one can perform 2-D imaging versus azimuth and elevation in two ways: (1) with a fixed rectangular array in the sequential mode, and (2) using a linear array in the sequential mode with transversal motion. This new imaging technique is denoted "DFTSQM". Computer simulation shows that DFTSQM is: (1) insensitive to target height, and (2) the performance is comparable to the standard SAR imaging technique.; Standard SAR and DFTSQM imaging techniques, are in complete agreement when detecting flat targets on the ground. However, a target above the ground appears closer in range and higher in Doppler in the case of SAR imaging. The discrepancy between the SAR and the DFTSQM imaging techniques is a measure of target height. On this basis, a new three-dimensional SAR imaging technique is developed by combining DFTSQM and SAR. Examples illustrate the performance of the 3-D SAR. |
