ANALYSIS AND COMPENSATION OF IONOSPHERIC TIME-VARIANT TEC EFFECT ON GEO SAR FOCUSING | Zendy

Xingyu Liang | Zendy; Zhuo Li | Zendy

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ANALYSIS AND COMPENSATION OF IONOSPHERIC TIME-VARIANT TEC EFFECT ON GEO SAR FOCUSING

Author(s) -

Xingyu Liang,

Zhuo Li

Publication year - 2019

Publication title -

progress in electromagnetics research m

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.216

H-Index - 31

ISSN - 1937-8726

DOI - 10.2528/pierm18112305

Subject(s) - tec , ionosphere , geodesy , compensation (psychology) , geology , remote sensing , geophysics , psychology , psychoanalysis

Compared to low Earth orbit (LEO) synthetic aperture radar (SAR), geosynchronous (GEO) SAR has a larger coverage and shorter revisit period. However, due to its longer integration time it will be affected by ionospheric time-variant total electron content (TEC), which introduces a phase error into the SAR azimuth signal. Using U.S. total electron content (USTEC) data, TEC variation with time on GEO SAR track is analyzed. It is shown that quadratic phase error caused by time-variant TEC is main effect on image focusing compared to higher order errors. Therefore, contrast optimization autofocus (COA) algorithm can be used for compensation. The key steps of COA are given. Simulations based on scenes derived from PALSAR2 data demonstrate the effectiveness of COA.

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