A synthetic aperture receiver with holographic recording

A receiver is described that sampled the 1 GHz radio field distribution along a horizontal line of length 32 m. The field distributions were recorded as one-dimensional, offset reference holograms. Computer processing of the holograms formed focused images of scatterers near the line-of-sight path between a C.W. transmitter and the receiving aperture. These images took the form of reconstructed wavefronts, which were further processed by a technique involving complex division and subtraction. Some test results are presented, in which a near-by signal source and an obstacle casting a shadow were imaged.