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## An introduction to resolution techniques

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We shall assume from now on that a DF system is available that is capable of measuring correctly, in single-ray conditions, at least the azimuth angle of arrival of the ray. In effect, instrumental errors and site errors will be regarded as negligible, although it is not essential to assume an absence of re-radiating objects near the DF; some of the discrete rays in multi-ray problems could arrive from such objects. Between these two extremes of NADF and very wide aperture DF (VWADF) lie WADFs with array dimensions of the order of a few λ; the physical dimensions fall generally in the range 50 to 500 m. It is with such systems that we shall be concerned, and the underlying question is whether their classical resolving power can be enhanced by intelligent analysis of the time-varying wave-field produced by the complex fading of two or more rays.

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