A novel approach to accurate baseline estimation

Knedlik, S.; Loffeld, Otmar; Hein, Achim; Arndt, Christoph

doi:10.1109/igarss.1999.773463

Cited by 12 publications

(6 citation statements)

References 4 publications

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“…Firstly, the approach has no capacity to distinguish between orbital errors and long-wavelength atmospheric delays. To our knowledge, this is a common problem in most related studies [12][13][14]20,23]. We therefore made the assumption that the long-wavelength signal only represents the orbital error, implying that part of the tropospheric delay will also be removed from the interferogram.…”

Section: Discussionmentioning

confidence: 99%

“…A simple but very effective solution is de-ramping from the InSAR interferogram using a linear or quadratic surface fitting [3,12]. The phase ramp is either subtracted from the original phase or used to refine the spatial baseline to infer a revised interferogram [13,14]. Given a wrapped-phase pattern, the unwrapping operation is always required before fitting.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Orbital Error in InSAR Interferogram Using Frequency and Spatial Domain Based Methods

Tian

Malhotra

et al. 2018

Remote Sensing

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Synthetic Aperture Radar Interferometry (SAR, InSAR) is increasingly being used for deformation monitoring. Uncertainty in satellite state vectors is considered to be one of the main sources of errors in applications such as this. In this paper, we present frequency and spatial domain based algorithms to model orbital errors in InSAR interferograms. The main advantage of this method, when applied to the spatial domain, is that the order of the polynomial coefficient is automatically determined according to the features of the orbital errors, using K-cross validation. In the frequency domain, a maximum likelihood fringe rate estimate is deployed to resolve linear orbital patterns in strong noise interferograms, where spatial-domain-based algorithms are unworkable. Both methods were tested and compared with synthetic data and applied to historical Environmental Satellite Advanced Synthetic Aperture Radar (ENVISAT ASAR) sensor and modern instruments such as Gaofen-3 (GF-3) and Sentinel-1. The validation from the simulation demonstrated that an accuracy of~1mm can be obtained under optimal conditions. Using an independent GPS measurement that is discontinuous from the InSAR measurement over the Tohoku-Oki area, we found a 31.45% and 73.22% reduction in uncertainty after applying our method for ASAR tracks 347 and 74, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Orbital Error in InSAR Interferogram Using Frequency and Spatial Domain Based Methods

Tian

Malhotra

et al. 2018

Remote Sensing

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“…This low precision in the orbital information can generate errors in parallel and perpendicular baseline estimation, which induces artifacts known as orbital ramps in azimuth and range directions, and whose superposition can result in a ramp with any orientation. This kind of phase artifact has been extensively studied in the past, proposing several approaches for removing them from the interferograms (Buckley et al, 2000;Knedlik et al, 1999;Rosen et al, 2004). During the processing of SAOCOM-1A data, range ramps became evident, as shown in Figure 5.…”

Section: Synthetic Aperture Radar Datamentioning

confidence: 99%

First assessment of the interferometric capabilities of SAOCOM-1A: New results over the Domuyo Volcano, Neuquén Argentina

Roa

Rosell

Solarte

et al. 2021

Journal of South American Earth Sciences

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“…In many cases, the phase artefacts induced by orbit errors are merely approximated with their linear (or quasi-linear) components, often referred to as "orbital ramps," and then compensated. Moreover, other techniques exploit the pixel offsets between the interferometric image pairs to estimate the baseline components [77,78]. The main drawback of this class of algorithms is their limited estimation accuracy that confines their use to preliminary coarse orbit estimation.…”

Section: Insar Technique For the Estimation Of Surface Displacementsmentioning

confidence: 99%

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

2017

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Synthetic Aperture RADAR Interferometry (InSAR) provides a unique tool for the quantitative measurement of the Earth's surface deformations induced by a variety of natural (such as volcanic eruptions, landslides and earthquakes) and anthropogenic (e.g., ground-water extraction in highly-urbanized areas, deterioration of buildings and public facilities) processes. In this framework, use of InSAR technology makes it possible the long-term monitoring of surface deformations and the analysis of relevant geodynamic phenomena. This review paper provides readers with a general overview of the InSAR principles and the recent development of the advanced multi-track InSAR combination methodologies, which allow to discriminate the 3-D components of deformation processes and to follow their temporal evolution. The increasing availability of SAR data collected by complementary illumination angles and from different RADAR instruments, which operate in various bands of the microwave spectrum (X-, L-and C-band), makes the use of multi-track/multi-satellite InSAR techniques very promising for the characterization of deformation patterns. A few case studies will be presented, with a particular focus on the recently proposed multi-track InSAR method known as the Minimum Acceleration (MinA) combination approach. The presented results evidence the validity and the relevance of the investigated InSAR approaches for geospatial analyses.

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A novel approach to accurate baseline estimation

Cited by 12 publications

References 4 publications

Modeling Orbital Error in InSAR Interferogram Using Frequency and Spatial Domain Based Methods

Modeling Orbital Error in InSAR Interferogram Using Frequency and Spatial Domain Based Methods

First assessment of the interferometric capabilities of SAOCOM-1A: New results over the Domuyo Volcano, Neuquén Argentina

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

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