Conceptual Performance of a Satellite Borne, Wide Swath Synthetic Aperture Radar

Tomìyasu, K.

doi:10.1109/tgrs.1981.350361

Cited by 137 publications

(60 citation statements)

References 15 publications

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“…1). The imaging swath width can be increased using the scanning SAR (ScanSAR) burst mode imaging technique in which the elevation beam (radar beam in range direction) is switched between different subswaths in the range direction between the successive bursts [23], [24]. In the ScanSAR acquisition mode, similar to stripmap mode, the radar beam is kept at constant squint angle.…”

Section: Tops Geometrymentioning

confidence: 99%

A Network-Based Enhanced Spectral Diversity Approach for TOPS Time-Series Analysis

Fattahi

Agram

Simons

2017

IEEE Trans. Geosci. Remote Sensing

173

109

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Abstract-For multitemporal analysis of synthetic aperture radar (SAR) images acquired with a terrain observation by progressive scan (TOPS) mode, all acquisitions from a given satellite track must be coregistered to a reference coordinate system with accuracies better than 0.001 of a pixel (assuming full SAR resolution) in the azimuth direction. Such a high accuracy can be achieved through geometric coregistration, using precise satellite orbits and a digital elevation model, followed by a refinement step using a time-series analysis of coregistration errors. These errors represent the misregistration between all TOPS acquisitions relative to the reference coordinate system. We develop a workflow to estimate the time series of azimuth misregistration using a network-based enhanced spectral diversity (NESD) approach, in order to reduce the impact of temporal decorrelation on coregistration. Example time series of misregistration inferred for five tracks of Sentinel-1 TOPS acquisitions indicates a maximum relative azimuth misregistration of less than 0.01 of the full azimuth resolution between the TOPS acquisitions in the studied areas. Standard deviation of the estimated misregistration time series for different stacks varies from 1.1e-3 to 2e-3 of the azimuth resolution, equivalent to 1.6-2.8 cm orbital uncertainty in the azimuth direction. These values fall within the 1-sigma orbital uncertainty of the Sentinel-1 orbits and imply that orbital uncertainty is most likely the main source of the constant azimuth misregistration between different TOPS acquisitions. We propagate the uncertainty of individual misregistration estimated with ESD to the misregistration time series estimated with NESD and investigate the different challenges for operationalizing NESD.Index Terms-Coregistration, interferometric synthetic aperture radar (InSAR), spectral diversity, terrain observation by progressive scan (TOPS).

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Section: Tops Geometrymentioning

confidence: 99%

A Network-Based Enhanced Spectral Diversity Approach for TOPS Time-Series Analysis

Fattahi

Agram

Simons

2017

IEEE Trans. Geosci. Remote Sensing

173

109

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“…This is achieved by selecting the scan angle as a function of range time. 5 The principle drawback of this deterministic and completely data independent coupling is that important information may irrecoverably be lost during data recording. For example, isorange elevation changes in mountainous terrains will cause a reduced antenna gain due to erroneous beam pointing, as shown in Fig.…”

Section: Information Content and Redundancy Reductionmentioning

confidence: 99%

“…This range is associated with an incident angle θ inc under the assumption of a flat terrain 5 The common use of long Tx pulses in a spaceborne radar requires additional precautions since the instantaneous scattering field on the ground is typically wider than the footprint of the elevation beam (see also Fig. 3).…”

Section: Information Content and Redundancy Reductionmentioning

confidence: 99%

“…This motivated the development of advanced SAR imaging modes with different tradeoffs between spatial coverage and azimuth resolution. The classical solution to wide-swath SAR imaging is ScanSAR, which increases the unambiguous swath width at the cost of an impaired azimuth resolution [5], [6]. The ScanSAR mode is of high importance for all spaceborne remote sensing applications that require frequent monitoring of large areas.…”

Section: Introductionmentioning

confidence: 99%

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Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing

Krieger

Gebert

Moreira

2008

IEEE Trans. Geosci. Remote Sensing

369

237

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Abstract-This paper introduces the innovative concept of multidimensional waveform encoding for spaceborne synthetic aperture radar (SAR). The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with improved performance and flexible imaging capabilities. Examples are high-resolution wide-swath radar imaging with compact antennas, enhanced sensitivity for applications like alongtrack interferometry and moving object indication, and the implementation of hybrid SAR imaging modes that are well suited to satisfy hitherto incompatible user requirements. Implementationspecific issues are discussed and performance examples demonstrate the potential of the new technique for different remote sensing applications.Index Terms-Adaptive radar, along-track interferometry (ATI), ambiguity reduction, digital beamforming, displaced phase centre antenna (DPCA), ground moving target indication (GMTI), high-resolution wide-swath SAR imaging, hybrid SAR, MIMO SAR, synthetic aperture radar (SAR), waveform diversity.

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“…The normal method to solve this contradiction problem is making compromise between the resolution and imaging swath, such as Spotlight SAR [1] and ScanSAR [2]. The classical HRWS system [3] can solve this contradiction at a certain extent, but it helpless for future spaceborne SAR to realize further shortens of the revisit times.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Waveform Encoding for Space-borne SAR in Azimuth

Di¹,

Gong²,

Guo³

2017

dtcse

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Abstract. High resolution wide swath is one of the most important missions for future spaceborne synthetic aperture radar (SAR). In this paper, a new multidimensional waveform encoding method which combined the multi-beams with multi-phase centers in azimuth is proposed. This new method can achieve a significant ambiguity deduction capacity for space-borne SAR, which is propitious to execute high resolution wide swath imaging task.

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Conceptual Performance of a Satellite Borne, Wide Swath Synthetic Aperture Radar

Cited by 137 publications

References 15 publications

A Network-Based Enhanced Spectral Diversity Approach for TOPS Time-Series Analysis

A Network-Based Enhanced Spectral Diversity Approach for TOPS Time-Series Analysis

Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing

Multidimensional Waveform Encoding for Space-borne SAR in Azimuth

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