Concept for a High MEO InSAR Seismic Monitoring System

Tralli, David M.; Foxall, W.; Schultz, Craig A.

doi:10.1109/aero.2007.352689

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…sensitivity poses, at the current level of technology, a fundamental challenge for MEO-SAR systems. Following the available literature [7]- [10], this article provides a discussion on the relevant changes experienced by a SAR system at MEO altitudes, showing MEO SAR qualifies to operate at moderate resolutions (tens of meters) with good sensitivity values.…”

Section: Introductionmentioning

confidence: 99%

MEO SAR: System Concepts and Analysis

Matar

Rodríguez-Cassolà

Krieger

et al. 2020

IEEE Trans. Geosci. Remote Sensing

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Existing microwave remote sensing instruments used for Earth observation face a clear tradeoff between spatial resolution and revisit times at global scales. The typical imaging capabilities of current systems range from daily observations at kilometer-scale resolutions provided by scatterometers to meter-scale resolutions at lower temporal rates (more than ten days) typical of synthetic aperture radars (SARs). A natural way to fill the gap between these two extremes is to use medium-Earthorbit SAR (MEO-SAR) systems. MEO satellites are deployed at altitudes above the region of low Earth orbits (LEOs), ending at around 2000 km and below the geosynchronous orbits (GEOs) near 35 786 km. MEO SAR shows a clear potential to provide advantages in terms of spatial coverage, downlink visibility, and global temporal revisit times, e.g., providing moderate resolution images (some tens of meters) at daily rates. This article discusses the design tradeoffs of MEO SAR, including sensitivity and orbit selection. The use of these higher orbits opens the door to global coverage in one-to two-day revisit or continental/oceanic coverage with multidaily observations, making MEO SAR very attractive for future scientific missions with specific interferometric and polarimetric capabilities.

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Section: Introductionmentioning

confidence: 99%

MEO SAR: System Concepts and Analysis

Matar

Rodríguez-Cassolà

Krieger

et al. 2020

IEEE Trans. Geosci. Remote Sensing

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“…Compared with LEO SAR, the medium Earth orbit (MEO) SAR has better accessibility and greater coverage. 4,5 However, along with the ascension of the orbit, the relative Satellite-Earth geometry of the MEO SAR will significantly deviate from a straight line, which poses many challenges for spaceborne SAR signal processing, particularly the imaging part.…”

Section: Introductionmentioning

confidence: 99%

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

Wang

Liu

Chen

et al. 2015

J. Appl. Remote Sens

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Abstract. Due to the larger orbital arc and longer synthetic aperture time in medium Earth orbit (MEO) synthetic aperture radar (SAR), it is difficult for conventional SAR imaging algorithms to achieve a good imaging result. An improved higher order nonlinear chirp scaling (NLCS) algorithm is presented for MEO SAR imaging. First, the point target spectrum of the modified equivalent squint range model-based signal is derived, where a concise expression is obtained by the method of series reversion. Second, the well-known NLCS algorithm is modified according to the new spectrum and an improved algorithm is developed. The range dependence of the twodimensional point target reference spectrum is removed by improved CS processing, and accurate focusing is realized through range-matched filter and range-dependent azimuth-matched filter. Simulations are performed to validate the presented algorithm. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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