A Novel Approach to Mitigation of Radar Beam Weighting Effect on Coherent Radar Imaging Using VHF Atmospheric Radar

Chen, Jenn-Shyong; Furumoto, Jun-ichi

doi:10.1109/tgrs.2011.2119374

Cited by 8 publications

(15 citation statements)

References 25 publications

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“…The need for using adaptable beamwidth in CRI has been demonstrated further by Chen et al (2011), with a simulation study. To validate the workability of CRI-DOA in deriving the aspect angle, more simulations were performed in this study.…”

Section: B By Crimentioning

confidence: 99%

“…To determine the locations of multiple DOAs, we employed the contour-based approach proposed by Chen et al (2008). To determine the locations of multiple DOAs, we employed the contour-based approach proposed by Chen et al (2008).…”

Section: B By Crimentioning

confidence: 99%

“…The Tx 7 /Rx 7 mode has been employed to find an adaptable radar beamwidth by Chen and Furumoto (2011). This was done by estimating the effective beamwidth u e , namely, the 3-dB half-beamwidth of a Gaussian-shaped beam pattern function, at various off-beam directions by means of a set of oblique radar beams.…”

Section: B Adaptable Radar Beamwidthmentioning

confidence: 99%

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Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect

Chen

Furumoto

2013

Journal of Atmospheric and Oceanic Technology

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The aspect angle, a measurement of the aspect sensitivity of atmospheric refractivity irregularities, was estimated with multiple-receiver coherent radar imaging (CRI) of very high frequency (VHF) atmospheric radar. Two CRI parameters retrieved by Capon's method were utilized to derive the aspect angle: brightness width from the vertical radar beam and the direction of arrival (DOA) of the echo center from the oblique radar beam. Differing from previous studies with CRI, the radar beam weighting effect on the CRI brightness distribution was considered, and moreover, the radar beamwidth used in study was adaptive to the signal-tonoise ratio (SNR) of data as well as the off-beam direction angle. The study is based on statistical results. It is shown that the brightness width, a representative of the aspect angle, obtained from the modified CRI brightness distribution of the vertical radar beam was generally larger than that without correction, and it was very close to the values derived from the DOA of the 18 oblique radar beam and the power distribution of multiple beam directions. Moreover, the aspect angle derived from the DOA varied with the radar beam direction, which was similar to that obtained from the comparison of echo powers of a radar beam pair; however, the DOA approach yielded a much larger aspect angle in the low-SNR condition. This study recommended a feasibility of improving the measurements of atmospheric parameters with CRI after removing the radar beam weighting effect suitably from the CRI brightness distribution.

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Section: B By Crimentioning

confidence: 99%

Section: B By Crimentioning

confidence: 99%

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Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect

Chen

Furumoto

2013

Journal of Atmospheric and Oceanic Technology

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“…A detailed derivation of adaptable beam width for the Tx/Rx mode in Table 1 can refer to [2]. The expressions given by [2] are addressed briefly below:…”

Section: Adaptable Radar Beam Widthmentioning

confidence: 99%

“…Differing from the study in [1], however, modification of brightness value was made with a suitable radar beam-weighting function (BWF) before estimating the two CRI parameters. The BWF used for correction is a Gaussian form, and its standard deviation, termed beam width hereafter, is adaptive to signal-to-noise ratio (SNR) of echoes as well as off-beam direction angle [2], namely, the BWF is adaptable. The use of adaptable beam width is to avoid over-modification of the brightness values at the edges of the imaged map; as a result, more reliable estimate of aspect angle can be obtained.…”

Section: Introductionmentioning

confidence: 99%

A study on aspect sensitivity of clear-air turbulence using coherent radar imaging of VHF atmospheric radar

Chen

Furumoto

2012

SPIE Proceedings

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Aspect sensitivity of clear-air turbulence was examined with multiple-receiver coherent radar imaging (CRI) of VHF atmospheric radar. The study was carried out by means of aspect angle, estimated from two CRI parameters: direction of arrival of echo center from oblique radar beam and brightness distribution width from vertical radar beam. The brightness distribution was retrieved by the Capon method. Modification of brightness value has been made with a suitable radar beam-weighting function before estimating the two CRI parameters. The radar beam-weighting function used for correction is a Gaussian form, and its standard deviation (beam width) varies with off-beam direction angle and is also adaptive to signal-to-noise ratio of echoes. The use of adaptable beam width can avoid over-modifying the brightness values at the edges of the imaged map, yielding a more reliable estimate of aspect angle. The CRI-estimated aspect angle was compared with that obtained from comparison of echo powers of different oblique radar beams. The statistical features of aspect angles obtained from the two approaches are consistent.

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Radar beam‐ and range‐weighting effects on three‐dimensional radar imaging for the atmosphere

Chen¹,

Chen²,

Furumoto³

2011

Radio Science

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[1] Multiple-receiver and multiple-frequency radar imaging techniques used with VHF atmospheric radar can improve, respectively, angular and range resolutions of the atmospheric irregularity structure inside the radar volume. In addition to the imaging method itself, calibration of the imaging is also crucial to yield a better visualization of the irregularity structure. In this paper, the three-dimensional radar imaging using multiple receivers and multiple frequencies simultaneously is demonstrated on the basis of numerical simulation with the Capon method. More than previous works did, radar beam and range weighting effects on the imaging were examined in this study. Beam weighting effect on angular brightness distribution of the scattering region is apparent, but it gives different impacts on the range imaging as accompanying with the range weighting effect: the higher the range position of the scattering region is, the smaller the synthetic influence of both weighting effects will be. Beam weighting effect also causes a range-shortening effect for a localized scattering region, which should be considered in interpreting the shift of range brightness distribution with angular location of the target. Moreover, it is demonstrated that adaptable beam width is effectual to recover a two-blob structure and a wavy layer. An experimental case was also investigated to demonstrate the need of correcting beam weighting effect using adaptable beam width; meanwhile, it suggests that an adaptable range weighting function could be helpful to a further amendment of the three-dimensional imaging.Citation: Chen, J.-S., C.-H. Chen, and J. Furumoto (2011), Radar beam-and range-weighting effects on three-dimensional radar imaging for the atmosphere, Radio Sci., 46, RS6014,

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A Novel Approach to Mitigation of Radar Beam Weighting Effect on Coherent Radar Imaging Using VHF Atmospheric Radar

Cited by 8 publications

References 25 publications

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect

A study on aspect sensitivity of clear-air turbulence using coherent radar imaging of VHF atmospheric radar

Radar beam‐ and range‐weighting effects on three‐dimensional radar imaging for the atmosphere

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