Estimation and Compensation of the Ionospheric Path Delay Phase in PALSAR-3 and NISAR-L Interferograms

Spatial and temporal variation in the free electron concentration in the ionosphere affects SAR interferograms, in particular at low radar frequencies. In this work, the identification, estimation, and compensation of ionospheric path delay phases in PALSAR-3 and NISAR-L interferograms are discussed...

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Bibliographic Details
Published in:Atmosphere 2024-06, Vol.15 (6), p.632
Main Authors: Wegmüller, Urs, Werner, Charles, Frey, Othmar, Magnard, Christophe
Format: Article
Language:English
Subjects:
Bandwidths
Compensation
dispersive phase
Free electrons
interferometry
Ionosphere
ionospheric path delay
Mitigation
non-dispersive phase
SAR
SAR (radar)
Spectral bands
Spectrum allocation
split-spectrum
Synthetic aperture radar
Temporal variations
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Summary:Spatial and temporal variation in the free electron concentration in the ionosphere affects SAR interferograms, in particular at low radar frequencies. In this work, the identification, estimation, and compensation of ionospheric path delay phases in PALSAR-3 and NISAR-L interferograms are discussed. Both of these L-band sensors simultaneously acquire SAR data in a main spectral band and in an additional, spectrally separated, narrower second band to support the mitigation of ionospheric path delays. The methods presented permit separating the dispersive and the non-dispersive phase terms based on the double-difference interferogram between the two available spectral bands and the differential interferogram of the main band. The applicability of the proposed methods is demonstrated using PALSAR-3-like data that were simulated based on PALSAR-2 SM1 mode data.
ISSN:2073-4433
2073-4433
DOI:10.3390/atmos15060632