A Parameter-Adjusting Polar Format Algorithm for Extremely High Squint SAR Imaging

Wang, Yan; Li, Jingwen; Chen, Jie; Xu, Huibin; Sun, Bing

doi:10.1109/tgrs.2013.2243156

Cited by 45 publications

(24 citation statements)

References 21 publications

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“…By assuming that the transmitted signal has a planar waveform, the differential slant range ∆R s can be approximated as [3,23].…”

Section: Interpolation-based Data Format Correctionmentioning

confidence: 99%

“…is range-independent, it can be fully counteracted by using the PA method discussed in [23]. On the other aspect, the range wavenumber variation caused by τd relies on both the range and azimuth, hence cannot be fully compensated by the PA method.…”

Section: Carrier Frequency and Chirp Ratementioning

confidence: 99%

“…Similar to the PA technique in [23], the new PA technique adjusts the carrier frequency fc and the chirp rate γ pulse by pulse based on the instant data acquisition geometry as …”

Section: Carrier Frequency and Chirp Ratementioning

confidence: 99%

“…This is because, if processed by these algorithms, the slant range that has been counteracted by the CVPI technique should be added back to the echo by using the zero padding, resulting in a much larger total data amount. The Polar Format Algorithm (PFA) seems to be the only frequency domain based algorithm that is capable of implementing a fast processing speed and a high data utilization efficiency [3,23]. However, due to the non-uniform azimuth sampling caused by the CVPI technique, the PFA cannot be directly applied for the SSS-RSSAR imaging.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

Wang

Yang

et al. 2017

Remote Sensing

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Abstract:In this paper, a new Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar (SSS-RSSAR) is proposed to generate a high-resolution image of a Region of Interest (ROI) tilted with respect to the satellite track. Comparing to the traditional Spaceborne Sliding Spotlight Synthetic Aperture Radar (SSS-SAR), the SSS-RSSAR is superior in contributing to less data amount, lighter computational load and hence higher observation efficiency. Unlike the Spaceborne Stripmap Range Sweep Synthetic Aperture Radar (SS-RSSAR) proposed in a previous paper, the SSS-RSSAR not only continuously sweeps the beam in range for the ROI tracking, but also in azimuth to enlarge the synthetic aperture for an improved azimuth resolution. Two aspects of the SSS-RSSAR are focused: system and imaging. For the system part, a Continuous Varying Pulse Interval (CVPI) technique is proposed to avoid the transmission blockage problem by non-uniformly adjusting the pulse intervals based on the geometry. For the imaging part, a Modified Polar Format Algorithm (MPFA) is proposed to accommodate the original polar format algorithm to the echo received with the CVPI technique. Moreover, an integrate system parameter design flow for the SSS-RSSAR is also suggested. The presented approach is evaluated by exploiting the point target simulations.

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“…By assuming that the transmitted signal has a planar waveform, the differential slant range ∆R s can be approximated as [3,23].…”

Section: Interpolation-based Data Format Correctionmentioning

confidence: 99%

Section: Carrier Frequency and Chirp Ratementioning

confidence: 99%

“…Similar to the PA technique in [23], the new PA technique adjusts the carrier frequency fc and the chirp rate γ pulse by pulse based on the instant data acquisition geometry as …”

Section: Carrier Frequency and Chirp Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

Wang

Yang

et al. 2017

Remote Sensing

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“…D IGITAL image reconstruction, such as image translation, scaling, rotation, and geometric correction, has been widely used in civilian and medical fields [1]- [19]. Owing to the increasing demand of performance, power consumption, and reliability, real-time digital image reconstruction is predominantly implemented on field programmable gate array (FPGA) [2], [3], [5], [6], [8]- [19].…”

Section: Introductionmentioning

confidence: 99%

Block Region of Interest Method for Real-Time Implementation of Large and Scalable Image Reconstruction

2015

IEEE Signal Process. Lett.

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In field programmable gate array (FPGA)-based reconstruction of high-resolution (several-gigabyte) images, architectures that store the entire source image in block memory are no longer feasible. In this letter, a block region of interest (ROI) method is proposed for large and scalable image reconstruction, using 2D truncated sinc interpolation by storing only a slice of the source image in block memory. To ensure a high hit rate in block memory for interpolation and improve memory access efficiency, this method provides an effective criterion for partitioning, which subdivides the output image into blocks based on the ROI in the source image. Moreover, a special storage pattern is designed to simultaneously provide 16 pixels for each interpolation to enable real-time implementation by full pipelining with no memory data redundancy. The proposed method was validated by experimental results on an FPGA board along with the corresponding simulations on MATLAB. Various image sizes were tested to prove its flexibility. The time required to reconstruct an output image of k k at 200 MHz was 2.79 s, thereby achieving a processing speed of 385 Mpixels/s in single floating point precision. Index Terms-2D sinc interpolation, block region of interest (ROI), large-image reconstruction, real-time implementation, scalable.1070-9908

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Cross‐range target response analysis for extreme high‐squint synthetic aperture radar

Burfeindt

2017

Micro & Optical Tech Letters

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We propose a formulation for predicting the cross‐range characteristics of the synthetic aperture radar (SAR) point‐spread function (PSF) for extremely high squints based on the concept of phased array factors. We demonstrate the validity of this approach by comparing theoretical predictions to PSF dimensions extracted from SAR images. The results show that the proposed approach is more robust than the conventional theory for extreme high‐squint scenarios.

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A Parameter-Adjusting Polar Format Algorithm for Extremely High Squint SAR Imaging

Cited by 45 publications

References 21 publications

A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging

Block Region of Interest Method for Real-Time Implementation of Large and Scalable Image Reconstruction

Cross‐range target response analysis for extreme high‐squint synthetic aperture radar

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