摘要 :
The object of the present research is the inverse aperture synthesis and its application in high the resolution imaging radar - Inverse Synthetic Aperture Radar (ISAR). The accent is made on the three-dimensional (3-D) geometry an...
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The object of the present research is the inverse aperture synthesis and its application in high the resolution imaging radar - Inverse Synthetic Aperture Radar (ISAR). The accent is made on the three-dimensional (3-D) geometry and kinematics of ISAR scenario, the high informative waveforms (signals) with linear frequency modulation, stepped frequency modulation, phase code modulation, and complementary phase code modulation. The ISAR signal formation with aforementioned waveforms, non-parametric and parametric image reconstruction algorithms are also in the focus of this work. To verify the geometry, signal models, and imaging algorithms results of numerical experiments are provided.
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摘要 :
The amplitude of a point target observed in an ISAR image is equal to their free space RCS when effective sidelobe windowing is used. Likewise, its location in the image is identifical to its actual location. The interpretation of...
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The amplitude of a point target observed in an ISAR image is equal to their free space RCS when effective sidelobe windowing is used. Likewise, its location in the image is identifical to its actual location. The interpretation of observed amplitude and dimensions of area targets is not as easy. The ISAR image of a rectangular flat plate formed by rotating it around its longer axis is significantly different from an ISAR image of the same plate rotated about its shorter axis. Both the amplitude and the size of the plate's image are different. In this paper, the theory of physical optics is reviewed in conjunction with the principles of ISAR processing to explain these differences.
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摘要 :
The amplitude of a point target observed in an ISAR image is equal to their free space RCS when effective sidelobe windowing is used. Likewise, its location in the image is identifical to its actual location. The interpretation of...
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The amplitude of a point target observed in an ISAR image is equal to their free space RCS when effective sidelobe windowing is used. Likewise, its location in the image is identifical to its actual location. The interpretation of observed amplitude and dimensions of area targets is not as easy. The ISAR image of a rectangular flat plate formed by rotating it around its longer axis is significantly different from an ISAR image of the same plate rotated about its shorter axis. Both the amplitude and the size of the plate's image are different. In this paper, the theory of physical optics is reviewed in conjunction with the principles of ISAR processing to explain these differences.
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摘要 :
In the present paper an analytical description of three-dimensional (3-D) inverse synthetic aperture radar (ISAR) geometry is performed. A model of 3-D ISAR signal with Barker’s phase code modulation (BPCM) is created. Image recon...
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In the present paper an analytical description of three-dimensional (3-D) inverse synthetic aperture radar (ISAR) geometry is performed. A model of 3-D ISAR signal with Barker’s phase code modulation (BPCM) is created. Image reconstruction procedure including range compression by cross correlation over fast time record data and azimuth compression by fast Fourier transform over slow time row data, is developed. Numerical experiment over the simulated ISAR data with Barker’s phase code modulation is accomplished to demonstrate the validity of the proposed ISAR signal model and image reconstruction procedure and the quality of the reconstructed ISAR image.
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摘要 :
Combining traditional inverse synthetic aperture radar (ISAR) imaging, interferometry technique and compressed sensing (CS), we studied the problem of interferometric ISAR imaging with sparse aperture. Based on the elaborate analy...
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Combining traditional inverse synthetic aperture radar (ISAR) imaging, interferometry technique and compressed sensing (CS), we studied the problem of interferometric ISAR imaging with sparse aperture. Based on the elaborate analysis of smoothed 10 algorithm in CS, we proposed joint smoothed 10 algorithm which is capable of maintaining coherence between ISAR images of different radars under sparse aperture, thus it could be applied to interferometric ISAR imaging. Besides, we discussed the relationship between sparsity degree and the precision of interferometric ISAR imaging result. Simulation results validate the effectiveness of proposed algorithm and rationality of our conclusions.
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摘要 :
In the present paper an analytical description of three-dimensional (3-D) inverse synthetic aperture radar (ISAR) geometry is performed. A model of 3-D ISAR signal with Barker’s phase code modulation (BPCM) is created. Image reco...
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In the present paper an analytical description of three-dimensional (3-D) inverse synthetic aperture radar (ISAR) geometry is performed. A model of 3-D ISAR signal with Barker’s phase code modulation (BPCM) is created. Image reconstruction procedure including range compression by cross correlation over fast time record data and azimuth compression by fast Fourier transform over slow time row data, is developed. Numerical experiment over the simulated ISAR data with Barker’s phase code modulation is accomplished to demonstrate the validity of the proposed ISAR signal model and image reconstruction procedure and the quality of the reconstructed ISAR image.
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This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the ...
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This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the plane by target rotation vector analysis. The modeling process is presented in detail. Both the models are reasonable, but are different to each other. They are then testified by applying them to interpret the bistatic turntable model, and to predict the possible imaging result. The turntable imaging simulations perfectly match the predictions of the second model, which is built by target rotation vector analysis. Further simulations of moving point-scatter bistatic imaging also indicate the validity of the second model. The deficiency of the first model is also discussed.
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摘要 :
This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the ...
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This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the plane by target rotation vector analysis. The modeling process is presented in detail. Both the models are reasonable, but are different to each other. They are then testified by applying them to interpret the bistatic turntable model, and to predict the possible imaging result. The turntable imaging simulations perfectly match the predictions of the second model, which is built by target rotation vector analysis. Further simulations of moving point-scatter bistatic imaging also indicate the validity of the second model. The deficiency of the first model is also discussed.
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摘要 :
This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the ...
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This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the plane by target rotation vector analysis. The modeling process is presented in detail. Both the models are reasonable, but are different to each other. They are then testified by applying them to interpret the bistatic turntable model, and to predict the possible imaging result. The turntable imaging simulations perfectly match the predictions of the second model, which is built by target rotation vector analysis. Further simulations of moving point-scatter bistatic imaging also indicate the validity of the second model. The deficiency of the first model is also discussed.
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摘要 :
This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the ...
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This work mainly discusses the image plane of the Bistatic ISAR. The image plane is modeled by two different methods separately. One is modeling the image plane according to the bistatic SAR image plane; the other is to model the plane by target rotation vector analysis. The modeling process is presented in detail. Both the models are reasonable, but are different to each other. They are then testified by applying them to interpret the bistatic turntable model, and to predict the possible imaging result. The turntable imaging simulations perfectly match the predictions of the second model, which is built by target rotation vector analysis. Further simulations of moving point-scatter bistatic imaging also indicate the validity of the second model. The deficiency of the first model is also discussed.
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