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Methods for Locating Stray-Signal Sources in Anechoic Chambers (PREPRINT)

机译：在消声室中定位杂散信号源的方法（pREpRINT）

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Two complementary methods for locating stray-signal sources in anechoic chambers are investigated and applied to measurement data. Both methods process single-frequency near-field data collected on a planar surface to reconstruct field values (images) elsewhere. The first method uses plane waves to back propagate the scan-plane data and is well suited for FFT-based rapid reconstruction of images on planar surfaces parallel to the scan plane. The second method uses the simple spherical-wave focusing technique and is flexible in that it can be used to generate images on either planar or non- planar surfaces from data collected on either planar or non-planar surfaces. Both methods include a spatial filter for isolating selected plane wave spectrum components. The two methods are used in combination to successfully locate the strong multiple-bounce stray signals that degrade the quiet zone of a near field bistatic RCS facility. Weaker diffraction stray signals are also imaged. Subsequent scan data confirms that the suppression of these stray signals indeed substantially improves the quality of the quiet-zone.

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