PFDIR – A Wideband Photonic-Assisted SAR System

Li, Ruoming; Li, Wangzhe; Dong, Yongwei; Wen, Zhilei; Zhang, Hanqing; Sun, Wei; Yang, Jiyao; Zeng, Henan; Deng, Yuhui; Luan, Yuchen; Xu, Weidi; Yang, Siwen; Mo, Zhenwei

doi:10.1109/taes.2023.3240111

Cited by 14 publications

(5 citation statements)

References 38 publications

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“…For UHR radar with centimeter resolution, several systems based on microwave photonic (MWP) technology have been built in recent years [42]. The simulation parameters we used in this paper are set according to a real MWP SAR system published in [3]. However, the available measured airborne UHR SAR data are all in broadside mode [3,4,43].…”

Section: Discussionmentioning

confidence: 99%

“…The simulation parameters we used in this paper are set according to a real MWP SAR system published in [3]. However, the available measured airborne UHR SAR data are all in broadside mode [3,4,43]. Since the MWP SAR is still in the development stage, the airborne MWP SAR data is scarce and the squint data is not yet available.…”

Section: Discussionmentioning

confidence: 99%

“…To show the influence of squint angles intuitively, we conduct several simulations with the parameters given in Table 2. The trajectory deviation used for the simulation is extracted from a real flight history obtained by an airborne microwave photonic-assisted SAR system [3], as shown in Figure 2. Here, no motion compensation is applied.…”

Section: Negative Effects Of Squint Anglementioning

confidence: 99%

“…Synthetic aperture radar (SAR) is an active remote-sensing technique that can operate in several different modes [1,2]. With the developments over the past few decades, it can realize ultra-high-resolution (UHR) up to the centimeter level [3][4][5]. For UHR squint spotlight SAR, the squint mode is more flexible compared with the side-looking mode [6,7], and the UHR means more detailed information about the observation scenarios of interest.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Two-Dimensional Autofocus for Ultra-High-Resolution Squint Spotlight Airborne SAR Based on Improved Spectrum Modification

Chen,

Qiu,

Cheng

et al. 2024

Remote Sensing

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For ultra-high-resolution (UHR) squint spotlight airborne synthetic aperture radar (SAR), the severe range-azimuth coupling caused by squint mode and the spatial and frequency dependence of the motion error brought by ultra-wide bandwidth both make it difficult to obtain satisfactory imaging results. Although some autofocus methods for squint airborne SAR have been presented in the published literature, their practical applicability in UHR situations remains limited. In this article, a new 2D wavenumber domain autofocus method combined with the Omega-K algorithm dedicated to UHR squint spotlight airborne SAR is proposed. First, we analyze the dependence of range envelope shift error (RESE) and range defocus on the squint angle and then propose a new spectrum modification strategy, after which the spectrum transforms into a quasi-side-looking one. The accuracy of estimation and compensation can be improved significantly in this way. Then, the 2D phase error can be calculated with the 1D estimated error by the mapping relationship, and after that the 2D compensation is performed in the wavenumber domain. Furthermore, the image-blocking technique and range-dependent motion error compensation method are embedded to accommodate the spatial-variant motion error for UHR cases. Simulations are carried out to verify the effectiveness of the proposed method.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Negative Effects Of Squint Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two-Dimensional Autofocus for Ultra-High-Resolution Squint Spotlight Airborne SAR Based on Improved Spectrum Modification

Chen,

Qiu,

Cheng

et al. 2024

Remote Sensing

Self Cite

View full text Add to dashboard Cite

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“…Increased resolution enhances the detail of scene and target information, which underscores the consistent drive towards high resolution in SAR technology development. For instance, microwave photonic (MWP) SAR can transmit signals with over 5 GHz bandwidth, yielding images with centimeter-level resolution [3][4][5]; spaceborne SAR, such as Capella, achieves high azimuth resolution through long-time staring spotlight processing [6,7]. However, these high-resolution SAR imaging techniques are confronted with problems such as severe echo signals coupling and significant parametric spatial variability, making batch-processing frequency domain algorithms (such as Chirp Scaling (CS), Omega-K, etc.)…”

Section: Introductionmentioning

confidence: 99%

An Efficient BP Algorithm Based on TSU-ICSI Combined with GPU Parallel Computing

Li,

Qiu,

Yang

et al. 2023

Remote Sensing

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High resolution remains a primary goal in the advancement of synthetic aperture radar (SAR) technology. The backprojection (BP) algorithm, which does not introduce any approximation throughout the imaging process, is broadly applicable and effectively meets the demands for high-resolution imaging. Nonetheless, the BP algorithm necessitates substantial interpolation during point-by-point processing, and the precision and effectiveness of current interpolation methods limit the imaging performance of the BP algorithm. This paper proposes a TSU-ICSI (Time-shift Upsampling-Improved Cubic Spline Interpolation) interpolation method that integrates time-shift upsampling with improved cubic spline interpolation. This method is applied to the BP algorithm and presents an efficient implementation method in conjunction with the GPU architecture. TSU-ICSI not only maintains the accuracy of BP imaging processing but also significantly boosts performance. The effectiveness of the BP algorithm based on TSU-ICSI is confirmed through simulation experiments and by processing measured data collected from both airborne SAR and spaceborne SAR.

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High‐resolution 3D imaging by microwave photonic time division multiplexing‐multiple‐input‐multiple‐output radar with broadband digital beamforming

Zhou,

Zhang,

Kong

et al. 2024

IET Radar Sonar & Navi

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A broadband microwave photonic time division multiplexing (TDM) multiple‐input‐multiple‐output (MIMO) radar is proposed in which photonic frequency quadrupling is adopted to generate broadband radar signals and photonic frequency mixing is implemented for de‐chirping processing of radar echoes. By utilising two radio frequency switches to control the signal transmission and reception, TDM‐MIMO mechanism is formed using a single microwave photonic radar transceiver. This microwave photonic TDM‐MIMO radar not only achieves high range resolution using broadband processing but also enables high angular resolution and forward‐looking imaging capability with low system complexity. Besides, a broadband digital beamforming (DBF) method is introduced to solve the broadband beam squint and broadening problems and implement near‐field correction. In the experiment, a microwave photonic TDM‐MIMO radar with an 8×8 T‐shape antenna array is established with a bandwidth of 8 GHz (18–26 GHz) in each channel. The range and angular resolutions are estimated to be ∼2 cm and ∼2°, respectively. Applying the broadband DBF method, high‐resolution 3D imaging of small targets is achieved with good focusing of targets and deep suppression of grating lobes and side lobes. Hence, the proposed microwave photonic TDM‐MIMO radar with broadband DBF provides a promising solution for high‐resolution 3D imaging.

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PFDIR – A Wideband Photonic-Assisted SAR System

Cited by 14 publications

References 38 publications

Two-Dimensional Autofocus for Ultra-High-Resolution Squint Spotlight Airborne SAR Based on Improved Spectrum Modification

Two-Dimensional Autofocus for Ultra-High-Resolution Squint Spotlight Airborne SAR Based on Improved Spectrum Modification

An Efficient BP Algorithm Based on TSU-ICSI Combined with GPU Parallel Computing

High‐resolution 3D imaging by microwave photonic time division multiplexing‐multiple‐input‐multiple‐output radar with broadband digital beamforming

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