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MENTAL MODEL · M6267

Synthetic Aperture

Synthetic Aperture
TechnicalHigh supportComputer Science
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

Aperture synthesis is an interferometric technique that combines signals collected by multiple telescopes to generate images with angular resolution equivalent to that of a telescope the size of the entire array. The technique uses the interference fringe patterns of the interferometer at each baseline distance and orientation to output Fourier transform components of the spatial brightness distribution of the observed target, and ultimately reconstructs a synthesized image of the celestial body from these measurements.

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Aperture synthesis is an interferometric technique that combines signals collected by multiple telescopes to generate images with angular resolution equivalent to that of a telescope the size of the entire array. The technique uses the interference fringe patterns of the interferometer at each baseline distance and orientation to output Fourier transform components of the spatial brightness distribution of the observed target, and ultimately reconstructs a synthesized image of the celestial body from these measurements.

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Antenna resolution is limited by the physical aperture: the larger the aperture, the narrower the beam and the finer the resolution. Synthetic aperture exploits platform motion, allowing a single small antenna to observe the same target sequentially from different positions, and coherently recombines these phase-differentiated signals as an 'equivalent large aperture', resulting in an antenna equivalent to one far exceeding its physical size. The essence is 'using motion plus signal processing to trade for size'.

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Source support: Explicit

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    zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E5%90%88%E6%88%90%E5%AD%94%E5%BE%84ZH · Explicit
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