A SAR image problem for missile-borne based on the platform anomaly movement is discussed in this paper. In this paper, a approximate illumination geometry has been defined and a new image model is presented. Image fo...
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ISBN:
(纸本)9781424411870
A SAR image problem for missile-borne based on the platform anomaly movement is discussed in this paper. In this paper, a approximate illumination geometry has been defined and a new image model is presented. Image formation from missile-borne synthetic aperture radar (SAR) is limited by image degradations caused by missile's non-level straight line movement. In this paper we assume that the missile is uniformity and beeline motion in a synthetic aperture time due to the missile's high speed. A different reference range is adopted to cope with the range-dependent secondary range compression (SRC) to different synthetic aperture. By this approach, the SRC error can be reduced effectively. Finally, simulation results verb the correctness and validity of the proposed methods.
Aimed at the problem of how to diminish SAR raw data apparently and realize SAR imaging effectively, a new approach for processing SAR raw data combined with Linde-Buzo-Gray (LBG) algorithm and Compressed Sensing (CS)...
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ISBN:
(纸本)9781467311595
Aimed at the problem of how to diminish SAR raw data apparently and realize SAR imaging effectively, a new approach for processing SAR raw data combined with Linde-Buzo-Gray (LBG) algorithm and Compressed Sensing (CS) is proposed in this paper. For SAR returned signals, CS is engaged to reduce the sampling number in the pulse duration, and LBG algorithm as a classical vector quantization (VQ) method, is employed to diminish encode number of every sample value. Next, data reconstruction process still contains the two ordinal steps according to LBG algorithm and CS theory, respectively. On the basis of that, the traditional SAR imaging method, frequencyscaling (FS) algorithm, is carried out to achieve the final SAR image. Simulation results show that the high quality SAR image can be achieved on condition of the SAR raw data is diminished furthermore obviously, which is compared with the traditional method.
Synthetic aperture radar (SAR) technology is an advanced radar imaging method with extensive applications across various fields. Although terahertz SAR technology is still in its early stages, it shows great potential...
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ISBN:
(纸本)9798331507800;9798331507794
Synthetic aperture radar (SAR) technology is an advanced radar imaging method with extensive applications across various fields. Although terahertz SAR technology is still in its early stages, it shows great potential for future developments due to the properties of broad-spectrum and high-resolution. Thus, it is crucial to advance research in this field on terahertz SAR. This paper studies terahertz SAR imaging based on the frequencyscaling (FS) algorithm and the detailed process and simulation results of the algorithm are provided. According to the FS algorithm, the simulation of multi-target SAR imaging at 220 GHz is conducted, and the peak side-lobe ratios of range and azimuth directions are approximately -17.5 dB and -22.8 dB, respectively. Furthermore, the resolution of the algorithm and the simulation remains consistent. These results indicate the excellent performance of target detection and imaging and may lay a solid foundation for developing terahertz SAR imaging
The image scene is limited by the small size of the spot, which is linked with the short wavelength of the laser in synthetic aperture ladar (SAL). The common wide-scene imaging mode in synthetic aperture radar, i.e.,...
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The image scene is limited by the small size of the spot, which is linked with the short wavelength of the laser in synthetic aperture ladar (SAL). The common wide-scene imaging mode in synthetic aperture radar, i.e., the terrain observation by progressive scans imaging mode, is extended and applied in SAL. A suitable imaging algorithm is also proposed according to the characteristics of the signal. First, the azimuth prefiltering based on the spectrum analysis is adopted to eliminate the azimuth spectrum aliasing caused by the steering of the antenna beam. Then, the improved frequency scaling algorithm is applied to complete the range compression and range cell migration correction. Meanwhile, the Doppler frequency shift induced by the continuous moving of the platform is compensated. Finally, the azimuth compression is completed in the Doppler domain, and the SAL image without ambiguity is obtained with the application of the dechirp technique. Simulation results provide the evidence on the effectiveness of the proposed method. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Aimed at the problem of how to diminish SAR raw data apparently and realize SAR imaging effectively, a new approach for processing SAR raw data combined with Linde-Buzo-Gray (LBG) algorithm and Compressed Sensing (CS)...
详细信息
ISBN:
(纸本)9781467311601
Aimed at the problem of how to diminish SAR raw data apparently and realize SAR imaging effectively, a new approach for processing SAR raw data combined with Linde-Buzo-Gray (LBG) algorithm and Compressed Sensing (CS) is proposed in this paper. For SAR returned signals, CS is engaged to reduce the sampling number in the pulse duration, and LBG algorithm as a classical vector quantization (VQ) method, is employed to diminish encode number of every sample value. Next, data reconstruction process still contains the two ordinal steps according to LBG algorithm and CS theory, respectively. On the basis of that, the traditional SAR imaging method, frequencyscaling (FS) algorithm, is carried out to achieve the final SAR image. Simulation results show that the high quality SAR image can be achieved on condition of the SAR raw data is diminished furthermore obviously, which is compared with the traditional method.
A SAR image problem for missile-borne based on the platform anomaly movement is discussed in this paper. In this paper,a approximate illumination geometry has been defined and a new image model is presented. Image for...
详细信息
A SAR image problem for missile-borne based on the platform anomaly movement is discussed in this paper. In this paper,a approximate illumination geometry has been defined and a new image model is presented. Image formation from missile-borne synthetic aperture radar (SAR) is limited by image degradations caused by missile’s non-level straight line movement. In this paper we assume that the missile is uniformity and beeline motion in a synthetic aperture time due to the missile’s high speed. A different reference range is adopted to cope with the range-dependent secondary range compression (SRC) to different synthetic aperture. By this approach,the SRC error can be reduced effectively. Finally,simulation results verify the correctness and validity of the proposed methods.
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