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Phase Calibration Of Multi-Baseline Pol-InSAR Data Stacks

Pardini, Matteo and Bianco, Vittorio and Papathanassiou, Konstantinos (2014) Phase Calibration Of Multi-Baseline Pol-InSAR Data Stacks. DLR-Interner Bericht. DLR-HR-IB 551-1/2014, 104 S.

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Abstract

New opportunities are arising in Earth observation with the use of multibaseline (MB) SAR being able to combine data stacks for an improved imaging and characterization of the observed scene. Prior to any MB coherent processing, it is necessary to correct the data stack for the phase contributions due to residual non-compensated platform motions (typical in airborne SAR applications) and/or atmospheric propagation delays (e.g. in spaceborne SAR), which in general are different from track to track. The classical calibration methods tackle the MB phase calibration problem by means of the detection of point-like scatterers. However, the effectiveness of these techniques is scenario-dependent, as both the number and spatial distribution of such scatterers varies. Especially in natural scenarios, the MB phase calibration is particularly challenging given the volumetric nature of the scattering. Moreover, a limited number of baselines can impair the detection performance, which in turn results into a degraded calibration quality. In this work we propose a new calibration method based on the minimization of the entropy applied on the vertical profile of the backscattered power to improve the performance. This allows to potentially exploit the MB SAR signal independently of the imaged scattering mechanism. With particular reference to SAR Tomography applications, the proposed method has been tested under controlled conditions by processing a simulated dataset of a forest stand. Performance results are shown in this presentation. The calibration accuracy has been also evaluated with an airborne L-Band dataset acquired by the DLR E-SAR platform over the forest site of Traunstein (Germany), and comparisons with the classical calibration techniques have been carried out.

Item URL in elib:https://elib.dlr.de/89964/
Document Type:Monograph (DLR-Interner Bericht)
Title:Phase Calibration Of Multi-Baseline Pol-InSAR Data Stacks
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pardini, MatteoUNSPECIFIEDUNSPECIFIED
Bianco, VittorioUniversita' degli studi di Napoli 'Federico II'UNSPECIFIED
Papathanassiou, KonstantinosUNSPECIFIEDUNSPECIFIED
Date:5 February 2014
Journal or Publication Title:DLR interner Bericht
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:104
Series Name:interner Bericht
Status:Published
Keywords:SAR, tomography, entropy minimization, phase calibration, baseline errors, atmospheric propagation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Pardini, Dr.-Ing. Matteo
Deposited On:24 Jul 2014 09:30
Last Modified:31 Jul 2019 19:47

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