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A hexagonal pseudo-polar FFT for formation-flying interferometric radiometry

A hexagonal pseudo-polar FFT for formation-flying interferometric radiometry
A hexagonal pseudo-polar FFT for formation-flying interferometric radiometry
A novel mission concept applying satellite formation flight to passive microwave interferometry was recently proposed to significantly improve the interferometer's spatial resolution. This concept was shown to sample the visibility in a hexagonal tile of polar grids, and to recover the brightness map, this visibility must be inverted via a discrete polar inverse Fourier transform. For a fast and accurate solution, this letter develops a modified hexagonal variant of the Pseudo-Polar Fast Fourier Transform (PPFFT) and its inverse, and explores its performance when applied to the proposed formation-flight radiometer. Compared to the conventional rectangular PPFFT, we find approximately a five-fold improvement in the recovered radiometric accuracy, where the RMS radiometric error is in the order of 10^-2 K. The impact of visibility interpolation method is also explored, showing that an FFT-based interpolation technique leads to the most accurate final image recovery.
1545-598X
1-5
Sugihara El Maghraby, Ahmed Kiyoshi
2908d60c-5467-460b-b1a4-b76ea694f453
Grubisic, Angelo
a4cab763-bbc0-4130-af65-229ae674e8c8
Colombo, Camilla
595ced96-9494-40f2-9763-ad4a0f96bc86
Tatnall, Adrian
2c9224b6-4faa-4bfd-9026-84e37fa6bdf3
Sugihara El Maghraby, Ahmed Kiyoshi
2908d60c-5467-460b-b1a4-b76ea694f453
Grubisic, Angelo
a4cab763-bbc0-4130-af65-229ae674e8c8
Colombo, Camilla
595ced96-9494-40f2-9763-ad4a0f96bc86
Tatnall, Adrian
2c9224b6-4faa-4bfd-9026-84e37fa6bdf3

Sugihara El Maghraby, Ahmed Kiyoshi, Grubisic, Angelo, Colombo, Camilla and Tatnall, Adrian (2018) A hexagonal pseudo-polar FFT for formation-flying interferometric radiometry. IEEE Geoscience and Remote Sensing Letters, 1-5. (doi:10.1109/LGRS.2018.2876022).

Record type: Letter

Abstract

A novel mission concept applying satellite formation flight to passive microwave interferometry was recently proposed to significantly improve the interferometer's spatial resolution. This concept was shown to sample the visibility in a hexagonal tile of polar grids, and to recover the brightness map, this visibility must be inverted via a discrete polar inverse Fourier transform. For a fast and accurate solution, this letter develops a modified hexagonal variant of the Pseudo-Polar Fast Fourier Transform (PPFFT) and its inverse, and explores its performance when applied to the proposed formation-flight radiometer. Compared to the conventional rectangular PPFFT, we find approximately a five-fold improvement in the recovered radiometric accuracy, where the RMS radiometric error is in the order of 10^-2 K. The impact of visibility interpolation method is also explored, showing that an FFT-based interpolation technique leads to the most accurate final image recovery.

Text
GRSL 2018 Sugihara (pre-proofing) - Accepted Manuscript
Available under License Creative Commons Attribution.
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More information

Submitted date: 7 February 2018
Accepted/In Press date: 4 August 2018
Published date: 8 November 2018

Identifiers

Local EPrints ID: 425345
URI: http://eprints.soton.ac.uk/id/eprint/425345
ISSN: 1545-598X
PURE UUID: fc6529fe-24d0-445f-89c3-86ac367066df
ORCID for Ahmed Kiyoshi Sugihara El Maghraby: ORCID iD orcid.org/0000-0001-9183-1317
ORCID for Camilla Colombo: ORCID iD orcid.org/0000-0001-9636-9360

Catalogue record

Date deposited: 12 Oct 2018 16:31
Last modified: 06 Oct 2020 19:01

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