Passive Location of an Airborne Transmitter by Microwave Holography.
GENERAL DYNAMICS SAN DIEGO CALIF ELECTRONICS DIV
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The report describes research on a new technique for passively locating an airborne microwave source from another aircraft. The technique is holography. The new aspect is that holograms are formed on a dielectric slab of finite breadth. The mechanism is interference between an incident plane wave and a slab-guided wave excited by an edge. This technique is new because the reference field is generated at the hologram consequently, for a single source coherence length need be only that of the slab. The technique suggests microwave integrated optics. The location of an airborne source is difficult when ranges are long if the sea surface reflects that is, multipath introduces errors in conventional aperture systems. Consequently, long baseline interferometers and sampling arrays are plausible. However, the report describes laboratory experiments on a longitudinal sensor which is flat and therefore somewhat more natural for aircraft installation than an array transverse to the flight path.
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