DocumentCode :
2780369
Title :
Measurement and mitigation of the ionosphere in L-band Interferometric SAR data
Author :
Rosen, Paul A. ; Hensley, Scott ; Chen, Curtis
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
fYear :
2010
fDate :
10-14 May 2010
Firstpage :
1459
Lastpage :
1463
Abstract :
Satellite-based repeat-pass Interferometric Synthetic Aperture Radar (InSAR) provides a synoptic high spatial resolution perspective of Earth´s changing surface, permitting one to view large areas quickly and efficiently. By measuring relative phase change from one observation to the next on a pixel-by-pixel basis, maps of deformation and change can be derived. Variability of the atmosphere and the ionosphere leads to phase/time delays that are present in the data that can mask many of the subtle deformation signatures of interest, so methods for mitigation of these effects are important. Many of these effects have been observed in existing ALOS PALSAR data, and studies are underway to characterize and mitigate the ionosphere using these data. Since the ionosphere is a dispersive medium, it is possible in principle distinguish the ionospheric signatures from the non-dispersive effects of deformation and the atmosphere. In this paper, we describe a method for mapping the ionosphere in InSAR data based on a multi-frequency split-spectrum processing technique. We examine a number of PALSAR data sets, including fully polarimetric and single-polarization 28 MHz bandwidth data, where anomalous effects in phase, amplitude and image registration have been observed. We demonstrate the estimation of the ionosphere by means of the split spectrum technique for estimating differential TEC, whereby a radar waveform is transmitted over the full PALSAR spectral band and widely separated portions of the receive spectrum are processed independently and compared for dispersive effects, and quantify its performance.
Keywords :
cartography; image registration; ionosphere; ionospheric measuring apparatus; radar imaging; radar interferometry; synthetic aperture radar; ALOS PALSAR data; L-band InSAR data; PALSAR spectral band; bandwidth 28 MHz; deformation maps; differential TEC estimation; dispersive medium; earth changing surface; image registration; ionosphere measurement; ionosphere mitigation; multifrequency split-spectrum processing technique; nondispersive effects; pixel-by-pixel observation; radar waveform; relative phase change measurement; satellite-based repeat-pass interferometric synthetic aperture radar; split spectrum technique; subtle deformation signatures; synoptic high spatial resolution; Atmosphere; Atmospheric measurements; Delay effects; Dispersion; Earth; Ionosphere; L-band; Phase measurement; Spatial resolution; Synthetic aperture radar interferometry;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Radar Conference, 2010 IEEE
Conference_Location :
Washington, DC
ISSN :
1097-5659
Print_ISBN :
978-1-4244-5811-0
Type :
conf
DOI :
10.1109/RADAR.2010.5494385
Filename :
5494385
Link To Document :
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