Unambiguous SAR imaging algorithm via spotlight mode for multichannel SAR systems

Guo, Xiaojiang; Gao, Yesheng; Wang, Kaizhi; Liu, Xingzhao

doi:10.1109/radar.2016.7485256

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Therefore, a hybrid sliding spotlight mode with parallel flight is adopted to meet imaging requirements. For the spectrum ambiguity phenomenon in this mode, the current solutions mainly include sub-aperture processing [25], full-aperture processing based on upsampling [26] and azimuth multichannel [27]. In this paper, echo preprocessing is used to remove spectrum ambiguity.…”

Section: > Replace This Line With Your Manuscript Id Number (Double-c...mentioning

confidence: 99%

Frequency-Domain Imaging Algorithm for SA-BiSAR Based on Azimuth Dealiasing

Zhou,

Hu,

Jiao

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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For the Doppler parameters coupling and spectral aliasing in the hybrid sliding spotlight mode of the spaceborneairborne bistatic SAR, a frequency domain imaging algorithm based on echo preprocessing is proposed in this paper. The article utilizes the idea of spectral analysis (SPECAN) technology to remove the spectrum aliasing by echo preprocessing, without subaperture partition and subaperture stitching operations, which reduces the computational burden. On this basis, the Legendre orthogonal polynomial expansion method is used to achieve a high accuracy approximation of the spaceborneairborne bistatic SAR (SA-BiSAR) slant range function. Combined with the method of series reversion (MSR), the accurate two-dimensional spectrum of the point target is derived, so that the high quality decoupling of the two-dimensional spectrum is achieved. Finally, the compensation functions are designed to complete the focusing imaging in the frequency domain. The simulation results of point targets and distributed targets show that the imaging algorithm proposed in this paper has good focusing performance and can improve the imaging quality of scene edge points.

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Section: > Replace This Line With Your Manuscript Id Number (Double-c...mentioning

confidence: 99%

Frequency-Domain Imaging Algorithm for SA-BiSAR Based on Azimuth Dealiasing

Zhou,

Hu,

Jiao

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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show abstract

“…However, with the continuous improvement in imaging indicators, the number of azimuth channels may increase significantly, and it will be insufficient to rely on azimuth multichannel technology to improve imaging performance. At the same time, the amplitude and phase errors between multiple channels can adversely affect image quality [18][19][20]. Another method is to use a single-channel, low pulse repetition frequency (PRF) technique.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Improvement of High-Resolution Wide-Swath Spaceborne Synthetic Aperture Radar Imaging with Low Pule Repetition Frequency

Wang,

Ruan,

Zhang

2023

Remote Sensing

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For a single-channel spaceborne synthetic aperture radar (SAR), the usage of a low pulse repetition frequency (PRF) is an effective technical way to extend the range swath. The sub-aperture imaging strategy is usually used to solve the problem of azimuth spectrum aliasing under the condition of a low PRF. However, the required up-sampling processing before the coherent synthesis of sub-images will lead to spectrum discontinuity between adjacent sub-images, which leads to an obvious grating lobe phenomenon after the process of sub-image synthesis, resulting in a significant decrease in image quality. For this issue, a high-resolution wide-swath (HRWS) imaging algorithm for a spaceborne SAR with a low PRF is proposed in this paper based on optimal spectrum shift processing. First, each sub-aperture is imaged using the typical range migration algorithm (RMA), and then all sub-images are up-sampled at the same time. Then, based on the criterion of the minimum grating lobe, the optimal spectrum shift is estimated. Finally, the spectrum of all sub-images is shifted and then all the shifted sub-images are synthesized coherently. The simulation data processing results verify the effectiveness of the proposed method.

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Portable millimeter wave 3D imaging radar

Zhang

Cao

2017

2017 IEEE Radar Conference (RadarConf)

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Unambiguous SAR imaging algorithm via spotlight mode for multichannel SAR systems

Cited by 3 publications

References 9 publications

Frequency-Domain Imaging Algorithm for SA-BiSAR Based on Azimuth Dealiasing

Frequency-Domain Imaging Algorithm for SA-BiSAR Based on Azimuth Dealiasing

Accuracy Improvement of High-Resolution Wide-Swath Spaceborne Synthetic Aperture Radar Imaging with Low Pule Repetition Frequency

Portable millimeter wave 3D imaging radar

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