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Imaging Radio Wave Sources With Two Spatially Non-Coherent, Sparse Wavefront Sampling Arrays And Multiplicative Processing

We describe a new method that locates radio wave sources by forming images. This approach has potential advantages over conventional direction finding because it shows reflection sources, which lower the accuracy of direction finding; in addition, images show distance as well as direction. The method is to use two sparse, separated arrays of receiving antennas to sample wavefronts. Measured phase and amplitude data are computer processed to form an image. Each array is coherent by means of a phase reference obtained from one of its antennas, but the two arrays are mutually non-coherent. This non-coherence permits multiplying image intensities to improve resolution. An example of experimental results is shown for wave-length 10 meters. The method has been used at wavelengths as long as 50 meters and as short as 33 cm; of course, distinct arrays were used for all these wavelengths.