摘要 :
The study of data acquired over a circular trajectory has raised an increasing interest in the SAR community. Two main reasons summarize the interest in such geometry. First, sub-wavelength resolution can be achieved, as the targe...
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The study of data acquired over a circular trajectory has raised an increasing interest in the SAR community. Two main reasons summarize the interest in such geometry. First, sub-wavelength resolution can be achieved, as the targets in the spotted area are observed under a 360° aperture. Second, the use of the information from different azimuthal directions allows one to obtain information of the scene in the third dimension, making possible a 3D target reconstruction. In any case, both applications require certain target reflectivity homogeneity. This paper shows several processing results and analyzes the potentials and limitations of circular SAR to perform tomography of semi-transparent media. Special processing aspects, like the estimation of residual motion errors due to inaccuracies in the navigation data, are also addressed. Data acquired at L-band by DLR's E-SAR system are used to demonstrate the high resolution and tomographic imaging capabilities of circular SAR. The results include the tomogram of a Luneburg lens, as well as preliminary results over manmade targets and vegetation.
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A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No i...
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A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No interpolation is used, and the processor achieves O(M*log2(M)*N*log2(N)) floating point operations where M and N are arbitrary numbers of data samples in azimuth and range. The SAR processor works for squint mode as well as broadside SAR operation.
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摘要 :
A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No i...
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A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No interpolation is used, and the processor achieves O(M*log2(M)*N*log2(N)) floating point operations where M and N are arbitrary numbers of data samples in azimuth and range. The SAR processor works for squint mode as well as broadside SAR operation.
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摘要 :
A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No i...
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A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No interpolation is used, and the processor achieves O(M*log2(M)*N*log2(N)) floating point operations where M and N are arbitrary numbers of data samples in azimuth and range. The SAR processor works for squint mode as well as broadside SAR operation.
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摘要 :
A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No i...
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A new phase preserving SAR processor that solves the range dependent range cell migration problem is presented and verified theoretically in this paper. The operations involved are only Fourier transforms and multiplications. No interpolation is used, and the processor achieves O(M*log2(M)*N*log2(N)) floating point operations where M and N are arbitrary numbers of data samples in azimuth and range. The SAR processor works for squint mode as well as broadside SAR operation.
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摘要 :
A recent circular synthetic aperture radar data collection contained various vehicles arid calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scat...
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A recent circular synthetic aperture radar data collection contained various vehicles arid calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit. The large scene contained 14 quad-trihedral calibration targets with radar cross sections that are similar to point targets in the elevation range of the scene. This paper presents an algorithm that uses the quad-trihedrals to generate global range focusing parameters and phase error corrections to the complex range profile. Qualitative and quantitative results show the focusing provides a significant improvement to wide-angle image registration and vehicle target discrimination.
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摘要 :
A recent circular synthetic aperture radar data collection contained various vehicles and calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scatt...
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A recent circular synthetic aperture radar data collection contained various vehicles and calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit. The large scene contained 14 quad-trihedral calibration targets with radar cross sections that are similar to point targets in the elevation range of the scene. This paper presents an algorithm that uses the quad-trihedrals to generate global range focusing parameters and phase error corrections to the complex range profile. Qualitative and quantitative results show the focusing provides a significant improvement to wide-angle image registration and vehicle target discrimination.
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摘要 :
A recent circular synthetic aperture radar data collection contained various vehicles arid calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scat...
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A recent circular synthetic aperture radar data collection contained various vehicles arid calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit. The large scene contained 14 quad-trihedral calibration targets with radar cross sections that are similar to point targets in the elevation range of the scene. This paper presents an algorithm that uses the quad-trihedrals to generate global range focusing parameters and phase error corrections to the complex range profile. Qualitative and quantitative results show the focusing provides a significant improvement to wide-angle image registration and vehicle target discrimination.
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This paper discusses cross-track SAR interferometry under crossing orbits. The underlaying theory is brie?y outlined, showing that a crossing angle between the ground tracks needs to be compensated by applying different squint ang...
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This paper discusses cross-track SAR interferometry under crossing orbits. The underlaying theory is brie?y outlined, showing that a crossing angle between the ground tracks needs to be compensated by applying different squint angles in order to have overlap in the the ground-spectral domain. Two sets of crossing orbits InSAR experiments are described. The results of the ?rst experiment, are discussed.
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摘要 :
This paper discusses cross-track SAR interferometry under crossing orbits. The underlaying theory is briefly outlined, showing that a crossing angle between the ground tracks needs to be compensated by applying different squint an...
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This paper discusses cross-track SAR interferometry under crossing orbits. The underlaying theory is briefly outlined, showing that a crossing angle between the ground tracks needs to be compensated by applying different squint angles in order to have overlap in the the ground-spectral domain. Two sets of crossing orbits InSAR experiments are described. The results of the first experiment, are discussed.
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