Digital beam forming synthetic aperture radar

Heer, C.; Shutie, P. F.

doi:10.1109/mwsym.2005.1517018

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…The limiting factor is usually the large antenna dimension required. Digital Beam Forming SAR (DBF SAR) techniques have been developed to overcome some of these limitations, however they have usually been aimed at smaller wavelength systems (C-, X-and Ka-band) and while these are very useful at higher frequencies, they do not lend themselves easily to lower wavelength applications [8].…”

Section: L-sar Array-fed Reflector Subsystemmentioning

confidence: 99%

“…A unique adaptation of the technique discussed in [8,9] has been made for longer wavelength antenna systems, such as L-band, where a reflector antenna is fed by a one-dimensional array feed [9] as shown in Figure 1. During transmit events, all of the feed elements illuminate the reflector resulting in a wide beam being formed while during receive only a subset of the feed elements are active, which produces a narrower beam.…”

Section: L-sar Array-fed Reflector Subsystemmentioning

confidence: 99%

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NASA L-SAR instrument for the NISAR (NASA-ISRO) Synthetic Aperture Radar mission

2016

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The National Aeronautics and Space Administration (NASA) in the United States and the Indian Space Research Organization (ISRO) have partnered to develop an Earth-orbiting science and applications mission that exploits synthetic aperture radar to map Earth's surface every 12 days or less. To meet demanding coverage, sampling, and accuracy requirements, the system was designed to achieve over 240 km swath at fine resolution, and using full polarimetry where needed. To address the broad range of disciplines and scientific study areas of the mission, a dual-frequency system was conceived, at L-band (24 cm wavelength) and S-band (10 cm wavelength). To achieve these observational characteristics, a reflector-feed system is considered, whereby the feed aperture elements are individually sampled to allow a scan-on-receive ("SweepSAR") capability at both L-band and S-band. The instrument leverages the expanding capabilities of on-board digital processing to enable real-time calibration and digital beamforming. This paper describes the mission characteristics, current status of the L-band Synthetic Aperture Radar (L-SAR) portion of the instrument, and the technology development efforts in the United States that are reducing risk on the key radar technologies needed to ensure proper SweepSAR operations.

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Section: L-sar Array-fed Reflector Subsystemmentioning

confidence: 99%

Section: L-sar Array-fed Reflector Subsystemmentioning

confidence: 99%

NASA L-SAR instrument for the NISAR (NASA-ISRO) Synthetic Aperture Radar mission

2016

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“…Analog Beam Forming (ABF) circuits are being replaced by Digital Beam Forming (DBF) techniques. The interest in the development of DBF systems for space applications is growing up quickly [1][2][3][4][5][6]. Complex DBF algorithms can be implemented and an Active Antenna Array can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Test and qualification of a Fault Tolerant FPGA based Active Antenna System for space applications

Brac¹,

Ferreyra²,

Velazco³

et al. 2009

2009 10th Latin American Test Workshop

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ISBN 978-1-4244-4207-2International audienceThis work presents a Fault Tolerant FPGA based Active Antenna system intended to be used in the space environment. The proposed design can control the electromagnetic radiation pattern emitted by an antenna array in real time with high reliability levels. The FPGA is a Commercial of the Shelf (COTS) device based on the Anti fuse technology. The design is optimized to reduce the area overhead allowing the control of multiple antennas by means of a single FPGA. The Fault Tolerance and high reliability achieved with the design is shown by means of a new test methodology

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“…A High-Resolution Wide-Swath (HRWS) Synthetic Aperture Radar (SAR) is a concept of Radar system with multiple receive antennas proposed by Astrium GmbH, [1], [2], [3], [4]. The performance of the system and the quality of the Radar image is improved by the means of Digital Beam-Forming (DBF) techniques on receive only.…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical antenna distortions on the performance of the HRWS SAR system

Ossowska¹,

Kim²,

Wiesbeck³

2007

2007 IEEE International Geoscience and Remote Sensing Symposium

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High-Resolution Wide-Swath (HRWS) SyntheticAperture Radar (SAR) is a multi-static spaceborne Radar. The performance of the Radar system is improved by the mean of DBF on receive in azimuth and in elevation. This requires an relieve antenna array with large number of elements. In this paper the performance of large antenna array under the influence of plane distortions is analyzed. Presented is the influence on the array factor of symmetrical, unsymmetrical and random mechnical distortion. The paper considers also the influence on the performance of the antenna distortion on the High-Resolution Wide-Swath (HRWS) Synthetic Aperture Radar (SAR) in elevation.

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Digital beam forming synthetic aperture radar

Cited by 5 publications

References 1 publication

NASA L-SAR instrument for the NISAR (NASA-ISRO) Synthetic Aperture Radar mission

NASA L-SAR instrument for the NISAR (NASA-ISRO) Synthetic Aperture Radar mission

Test and qualification of a Fault Tolerant FPGA based Active Antenna System for space applications

Influence of mechanical antenna distortions on the performance of the HRWS SAR system

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