Impact of ambiguities in multistatic SAR some specificities of an L-band interferometric cartwheel

Fjørtoft, R.; Souyris, J.-C.; Gaudin, Jean-Marc; Durand, P.; Massonnet, D.

doi:10.1109/igarss.2004.1370672

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…where AASR is the azimuth ambiguity-to-signal ratio (AASR), i.e., similarly to thermal noise [7]- [8]. Observations of several TanDEM-X interferograms, such as the one in Fig.…”

Section: Introductionmentioning

confidence: 99%

Decorrelating Ambiguities in SAR Interferometry Through Slight PRI Variation

Villano

Peixoto

Ustalli

et al. 2022

IEEE Trans. Geosci. Remote Sensing

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Synthetic aperture radar (SAR) interferometry is a well-established technique for producing high-resolution digital elevation models (DEMs) of the Earth's surface and measuring displacements on different time scales. Observations of SAR interferograms, however, show that azimuth ambiguities can be coherently imaged and may lead to phase biases and coherence losses that significantly degrade the interferometric performance. Whereas imposing very low ambiguity levels may represent a severe design constraint for a spaceborne SAR system, a slight variation of the pulse repetition interval (PRI) is a new, simple, yet effective technique to decorrelate ambiguities, which in turn reduces the phase biases and coherence losses without substantially affecting the imaged swath width. An additional benefit of the PRI variation is that range ambiguities also become decorrelated. This paper addresses two cases: For the repeat-pass case, slightly different pulse repetition frequencies (PRFs) can be used for the two acquisitions and the minimum required PRF difference can be analytically derived resorting to the power spectral density of the ambiguous signals; For the single-pass case, a slight variation of the PRI during the common acquisition is an effective solution, in case an along-track baseline is present. In particular, a square wave PRI variation scheme outperforms sinusoidal or random ones. Finally, simulations using TanDEM-X data are presented to show the improvement in interferogram and DEM quality resulting from ambiguity decorrelation. This work is relevant for the design of future spaceborne interferometric SAR systems and for the enhanced exploitation of current ones.

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“…where AASR is the azimuth ambiguity-to-signal ratio (AASR), i.e., similarly to thermal noise [7]- [8]. Observations of several TanDEM-X interferograms, such as the one in Fig.…”

Section: Introductionmentioning

confidence: 99%

Decorrelating Ambiguities in SAR Interferometry Through Slight PRI Variation

Villano

Peixoto

Ustalli

et al. 2022

IEEE Trans. Geosci. Remote Sensing

View full text Add to dashboard Cite

show abstract

“…V, 2011). Moreover, the interferometric Cartwheel (R. Fjortoft, 2004) and the BISSAT mission (A. Moccia, 2002) are proposed, which have bistatic SAR imaging mode.…”

Section: Introductionmentioning

confidence: 99%

A Novel Proposal of Gaofen-3 Satellite Constellation for Multi-Applications

Qiu

Ding

Lei

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Gaofen-3 is the first C-band fully polarimetric SAR satellite in China, which is widely used in various fields such as ocean monitoring, disaster reduction and so on. In this paper, a new satellite constellation is proposed based on the orbit of Gaofen-3 satellite. The constellation includes Gaofen-3 and other two duplicates. It is able to do repeat-pass interferometry, repeat-pass differential interferometry, along-track interferometry and stereo measurement. With these abilities, it can generate the earth DEM without ground control points and have better performance in moving target identification and monitoring. The performance and the system requirements are analysed, which provides a good reference for the design of spaceborne SAR constellation.

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