منابع مشابه
Optical Aperture Synthesis
Optical aperture synthesis (OAS) from an aircraft platform is considered. Critical technical risks for implementation of OAS are examined for active and passive systems. The improved range for target recognition and identification makes OAS an attractive high-risk, high-payoff proposition.
متن کاملAntenna Array Design in Aperture Synthesis Radiometers 169 Antenna Array Design in Aperture Synthesis Radiometers
During the past few decades, there has been growing interest in the use of microwave and millimeter wave radiometers for remote sensing of the Earth. Due to the need of large antennas and scanning mechanism, the conventional real aperture radiometer becomes infeasible for high spatial resolution application. Interferometric aperture synthesis was suggested as an alternative to real aperture rad...
متن کاملFrames and Phaseless Reconstruction
Frame design for phaseless reconstruction is now part of the broader problem of nonlinear reconstruction and is an emerging topic in harmonic analysis. The problem of phaseless reconstruction can be simply stated as follows. Given the magnitudes of the coefficients generated by a linear redundant system (frame), we want to reconstruct the unknown input. This problem first occurred in X-ray crys...
متن کاملChapter 9: Interferometry and Aperture Synthesis
How can we get higher angular resolution than the simple full width at half maximum of the Airy function,/D, where D is the largest that we can afford? One answer is indicated in the bottom panel of Figure 8.18. If we mask off all of our telescope mirror except two small apertures of diameter d at the edge, the “central peak” of our image becomes twice as sharp as the Airy function but with h...
متن کاملOptical aperture synthesis with electronically connected telescopes
Highest resolution imaging in astronomy is achieved by interferometry, connecting telescopes over increasingly longer distances and at successively shorter wavelengths. Here, we present the first diffraction-limited images in visual light, produced by an array of independent optical telescopes, connected electronically only, with no optical links between them. With an array of small telescopes,...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1978
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/182.3.411