Ka-band SAR interferometer

Germani, Chiara; Venturini, Roberto; Ludwig, Michael; Daganzo-Eusebio, Elena; D’Addio, Salvatore; Gabriele, A.

doi:10.1109/igarss.2012.6352050

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The accuracy in locating each target is dependent not only on the noises affecting the observables but also on the accuracy of the knowledge of the system parameters involved in (5). The most sensitive ones are indeed the baselines, as a slight change in the phase center would significantly impact the interferometric phase in (5).…”

Section: Model For Local Accuracymentioning

confidence: 99%

“…As an example, let us assume the typical SRTM spacing d = 90 m and vertical accuracy of 5 m and say a horizontal accuracy of 20 m [17] to calibrate the normal baseline of a Ka-band interferometric SAR [5]- [7] with 25 • incidence angle, aiming to an HRTI-3 quality DEM with σ Z = 0.85 m [22]. Let us assume altitude variations of, for example, 2000 m with respect to the value predicted by GCP (DEMs may have voids in correspondence to steep slopes [1]).…”

Section: Baseline Calibration From Reference Dem: Single Swathmentioning

confidence: 99%

“…In this paper, we make specific reference to a single-pass spaceborne SAR interferometer exploiting two antennas with a boom, like SRTM [1], [2] or the Ka-band concepts proposed in literature [5]- [7]. In such systems, one of the major challenges in the generation of DEM with metric accuracy is the estimation of baselines, which is subject to mechanical vibrations with hertz or subhertz frequencies [8] and where the limited extent of the boom demands for accuracies within tens of micrometers.…”

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confidence: 99%

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Generation and Calibration of High-Resolution DEM From Single-Baseline Spaceborne Interferometry: The “Split-Swath” Approach

Melini

Guarnieri

Giudici

2014

IEEE Trans. Geosci. Remote Sensing

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This paper focuses on the generation of very high resolution digital elevation models (DEMs) mainly from single-baseline spaceborne synthetic aperture radar (SAR) systems. The stringent requirements on vertical accuracy demand for frequent and accurate measures of the baselines, subject to mechanical vibrations of the boom that may be severe when long booms are exploited. This paper proposes a solution that exploits an existent coarse-resolution DEM, for example, the Shuttle Radar Topography Mission, as a set of ground control points (GCPs). A computational model and an inversion scheme are introduced to jointly take into account the information coming from the grid of GCP and the local shifts measured during image coregistration. The model properly takes account for the quality of the GCP, its location with respect to the target of interest, and the interferogram noise in correspondence to the GCP. A novel “split-swath” approach is proposed to enhance the quality of the baseline estimates. The mode exploits two narrow strips with significant diversity in incidence angle, achieved, for example, by ScanSAR or TOPSAR mode. An example of design is provided by assuming a Ka-band topographic spaceborne SAR mission

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Section: Model For Local Accuracymentioning

confidence: 99%