Performance Analysis of Phase Gradient Autofocus for Compensating Ionospheric Phase Scintillation in BIOMASS P-Band SAR Data

Zhuo Li; Shaun Quegan; Jie Chen; Neil C. Rogers

doi:10.1109/LGRS.2015.2402833

Performance Analysis of Phase Gradient Autofocus for Compensating Ionospheric Phase Scintillation in BIOMASS P-Band SAR Data

Zhuo Li
, Shaun Quegan
, Jie Chen
, Neil C. Rogers

School of Electronic and Information Engineering

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

The P-band synthetic aperture radar of the European Space Agency BIOMASS mission will be affected by ionospheric phase scintillation at high latitudes, which introduces a random high-order azimuth phase error. The dependence of the performance of the phase gradient autofocus (PGA) algorithm for scintillation compensation on the strength of ionospheric turbulence and the signal-to-clutter ratio (SCR) is analyzed. In order to keep resolution degradation below 2%, the SCR must exceed 16 and 20 dB for turbulence strengths C_kL=10³³ and 10³⁴, respectively. For large values of C_kL, phase scintillation adds significantly to post-PGA degradation in the integrated and peak sidelobe ratios. Simulations based on scenes derived from PALSAR data demonstrate the effectiveness of PGA.

Original language	English
Article number	7047673
Pages (from-to)	1367-1371
Number of pages	5
Journal	IEEE Geoscience and Remote Sensing Letters
Volume	12
Issue number	6
DOIs	https://doi.org/10.1109/LGRS.2015.2402833
State	Published - Jun 2015

Keywords

Image quality
ionospheric phase scintillation
phase gradient autofocus (PGA)
synthetic aperture radar (SAR)

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10.1109/LGRS.2015.2402833

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title = "Performance Analysis of Phase Gradient Autofocus for Compensating Ionospheric Phase Scintillation in BIOMASS P-Band SAR Data",

abstract = "The P-band synthetic aperture radar of the European Space Agency BIOMASS mission will be affected by ionospheric phase scintillation at high latitudes, which introduces a random high-order azimuth phase error. The dependence of the performance of the phase gradient autofocus (PGA) algorithm for scintillation compensation on the strength of ionospheric turbulence and the signal-to-clutter ratio (SCR) is analyzed. In order to keep resolution degradation below 2\%, the SCR must exceed 16 and 20 dB for turbulence strengths CkL=1033 and 1034, respectively. For large values of CkL, phase scintillation adds significantly to post-PGA degradation in the integrated and peak sidelobe ratios. Simulations based on scenes derived from PALSAR data demonstrate the effectiveness of PGA.",

keywords = "Image quality, ionospheric phase scintillation, phase gradient autofocus (PGA), synthetic aperture radar (SAR)",

author = "Zhuo Li and Shaun Quegan and Jie Chen and Rogers, \{Neil C.\}",

note = "Publisher Copyright: {\textcopyright} 2004-2012 IEEE.",

year = "2015",

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doi = "10.1109/LGRS.2015.2402833",

language = "英语",

volume = "12",

pages = "1367--1371",

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number = "6",

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T1 - Performance Analysis of Phase Gradient Autofocus for Compensating Ionospheric Phase Scintillation in BIOMASS P-Band SAR Data

AU - Li, Zhuo

AU - Quegan, Shaun

AU - Chen, Jie

AU - Rogers, Neil C.

PY - 2015/6

Y1 - 2015/6

N2 - The P-band synthetic aperture radar of the European Space Agency BIOMASS mission will be affected by ionospheric phase scintillation at high latitudes, which introduces a random high-order azimuth phase error. The dependence of the performance of the phase gradient autofocus (PGA) algorithm for scintillation compensation on the strength of ionospheric turbulence and the signal-to-clutter ratio (SCR) is analyzed. In order to keep resolution degradation below 2%, the SCR must exceed 16 and 20 dB for turbulence strengths CkL=1033 and 1034, respectively. For large values of CkL, phase scintillation adds significantly to post-PGA degradation in the integrated and peak sidelobe ratios. Simulations based on scenes derived from PALSAR data demonstrate the effectiveness of PGA.

AB - The P-band synthetic aperture radar of the European Space Agency BIOMASS mission will be affected by ionospheric phase scintillation at high latitudes, which introduces a random high-order azimuth phase error. The dependence of the performance of the phase gradient autofocus (PGA) algorithm for scintillation compensation on the strength of ionospheric turbulence and the signal-to-clutter ratio (SCR) is analyzed. In order to keep resolution degradation below 2%, the SCR must exceed 16 and 20 dB for turbulence strengths CkL=1033 and 1034, respectively. For large values of CkL, phase scintillation adds significantly to post-PGA degradation in the integrated and peak sidelobe ratios. Simulations based on scenes derived from PALSAR data demonstrate the effectiveness of PGA.

KW - Image quality

KW - ionospheric phase scintillation

KW - phase gradient autofocus (PGA)

KW - synthetic aperture radar (SAR)

UR - https://www.scopus.com/pages/publications/84924874267

U2 - 10.1109/LGRS.2015.2402833

DO - 10.1109/LGRS.2015.2402833

M3 - 文章

AN - SCOPUS:84924874267

SN - 1545-598X

VL - 12

SP - 1367

EP - 1371

JO - IEEE Geoscience and Remote Sensing Letters

JF - IEEE Geoscience and Remote Sensing Letters

IS - 6

M1 - 7047673

ER -

Performance Analysis of Phase Gradient Autofocus for Compensating Ionospheric Phase Scintillation in BIOMASS P-Band SAR Data

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Keywords

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