Interpolation Methods with Phase Control for Backprojection of Complex-Valued SAR Data†

Blekinge Tekniska Högskola, Institutionen för matematik och naturvetenskap Univ Duisburg Essen, DEU Univ Duisburg Essen, DEU MDPI 2022

Ivanenko, Yevhen
Vu, Viet Thuy
Batra, Aman
Kaiser, Thomas
Pettersson, Mats

Time-domain backprojection algorithms are widely used in state-of-the-art synthetic aperture radar (SAR) imaging systems that are designed for applications where motion error compensation is required. These algorithms include an interpolation procedure, under which an unknown SAR range-compressed data parameter is estimated based on complex-valued SAR data samples and backprojected into a defined image plane. However, the phase of complex-valued SAR parameters estimated based on existing interpolators does not contain correct information about the range distance between the SAR imaging system and the given point of space in a defined image plane, which affects the quality of reconstructed SAR scenes. Thus, a phase-control procedure is required. This paper introduces extensions of existing linear, cubic, and sinc interpolation algorithms to interpolate complex-valued SAR data, where the phase of the interpolated SAR data value is controlled through the assigned a priori known range time that is needed for a signal to reach the given point of the defined image plane and return back. The efficiency of the extended algorithms is tested at the Nyquist rate on simulated and real data at THz frequencies and compared with existing algorithms. In comparison to the widely used nearest-neighbor interpolation algorithm, the proposed extended algorithms are beneficial from the lower computational complexity perspective, which is directly related to the offering of smaller memory requirements for SAR image reconstruction at THz frequencies. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
open access

backprojection; complex SAR interpolation; complex-valued SAR data interpolation; GBP; THz SAR; Error compensation; Image reconstruction; Interpolation; Parameter estimation; Phase control; Radar imaging; Synthetic apertures; Time domain analysis; Backprojections; Complex synthetic aperture radar interpolation; Complex-valued; Complex-valued synthetic aperture radar data interpolation; Data interpolation; Image plane; Phase-Control; Radar data; THz synthetic aperture radar; Synthetic aperture radar; algorithm; article; memory; simulation; telecommunication; Signal Processing; Signalbehandling; Article in journal; info:eu-repo/semantics/article; text

10.3390.s22134941

application/pdf
English

HKR oai:DiVA.org:bth-23504
0000-0002-3928-6064
0000-0003-3945-8951
0000-0002-6643-312X
doi:10.3390/s22134941
ISI:000823517300001
Scopus 2-s2.0-85133125937
1348932502

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