Subaperture autofocus for synthetic aperture radar - IEEE Xplore
网页1994年4月30日 · A subaperture autofocus algorithm for synthetic aperture radar (SAR) partitions range-compressed phase-history data collected over a full aperture into equal-width subapertures. Application of a one-dimensional Fourier transform to each range bin converts each subaperture data set into a full-scene image (map).
Subaperture - an overview | ScienceDirect Topics
网页Based on different shapes of the subaperture, annular subaperture stitching and circular stitching methods are proposed. The annular subaperture stitching method is an effective way to extend the vertical dynamic range of a conventional interferometer, but it can only accomplish measurements for rotationally symmetric aspheric surfaces [4–6] .
Subaperture stitching algorithms: A comparison - ScienceDirect
网页2017年5月1日 · Subaperture stitching interferometry enables test of large optics beyond the aperture and dynamic range of a standard interferometer because only a small subaperture of the optics is tested in a single measurement.
SAR Image Formation via Subapertures and 2D Backprojection
网页Here, a new subaperture-based imaging algorithm is proposed, which first forms range-Doppler (RD) images from slow-time sub-intervals, and then coherently integrates over the resulting coarse-resolution RD maps to produce a full resolution SAR image.
Subaperture stitching wavelength scanning interferometry for …
网页2021年2月10日 · Subaperture stitching wavelength scanning interferometry with a high-accuracy multi-axis position stage is proposed for measuring complex surface shapes such as aspherical and freeform optics. Typical optical approaches suffer due to poor fringe visibility when it comes to complex-shaped optics.
A Parameter-Adjusting Auto-Registration Overlapped Subaperture ...
网页2023年6月14日 · To enlarge the auto-registration imaging swath, a parameter-adjusting auto-registration overlapped subaperture algorithm (PAAR-OSA) is proposed in this article. By collaboratively designing the subapertures within each frame and among different frames in the stabilized-scene coordinate and cooperatively compensating the phase error of all ...
Subaperture stitching testing for fine flat mirrors with large ...
网页2019年9月1日 · Subaperture stitching testing has been primarily developed for testing large-aperture optics, especially large flat mirrors, spherical surfaces with high numerical aperture, and large convex surfaces. Based on different shapes of the subaperture, annular subaperture stitching and circular stitching methods are proposed.
Subaperture stitching computation time optimization using a …
网页A stitching algorithm, in principle, uses overlaps between subapertures to eliminate aberrations of each subaperture to obtain a full aperture for further analysis. This process is computation time demanding and requires optimization in order to obtain a result in a reasonable time to reduce, in turn, the overall manufacturing time.
Subaperture metrology technologies extend capabilities in optics ...
网页2005年10月25日 · QED Technologies has developed the Subaperture Stitching Interferometer (SSI) that extends the effective aperture and dynamic range of a phase measuring interferometer. The SSI's novel developments in software and hardware improve the capacity and accuracy of traditional interferometers, overcoming many of the limitations previously faced.
Subaperture autofocus for synthetic aperture radar
网页1994年4月1日 · A subaperture autofocus algorithm for synthetic aperture radar (SAR) partitions range-compressed phase-history data collected over a full aperture into equal-width subapertures. Application of a one-dimensional Fourier transform to each range bin converts each subaperture data set into a full-scene image (map).