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Fractional OAM Vortex SAR Imaging Based on chirp scaling algorithm

RADIO SCIENCE 2025年第3期60卷 1-14页

作者： Liu, Yu Du, Yongxing Li, Baoshan Qin, Ling Li, Chenlu Inner Mongolia Univ Sci & Technol Baotou Peoples R China

Vortex electromagnetic wave carries orbital angular momentum. Combined with Doppler information provided by radar platform movement, vortex electromagnetic wave can achieve higher resolution target imaging in SAR Imaging technology. In this paper, fractional order OAM vortex SAR imaging is studied. Firstly, the side-looking strip SAR imaging model is established. Then, the scattering echo equation of fractional order OAM is derived. Finally, the imaging simulation of multi-point target and single point target under Gaussian SNR is carried out by chirp scaling algorithm. The experimental results show that compared with the integer order OAM Vortex SAR Imaging, the fractional order OAM Vortex SAR Imaging in this paper has stronger robustness in Multi-target and Noise environment, which proves the effectiveness of the fractional order Vortex SAR Imaging.

关键词： fractional OAM vortex SAR imaging chirp scaling algorithm

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Azimuth-Invariant Motion Compensation and Imaging chirp scaling algorithm for Multiple-Receiver Synthetic Aperture Sonar

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IEEE ACCESS 2022年 10卷 114060-114076页

作者： Tian, Zhen Zhong, Heping Tang, Jinsong Zhang, Jiafeng Naval Univ Engn Naval Inst Underwater Acoust Technol Wuhan 430030 Hubei Peoples R China

To improve the imaging quality of conventional imaging algorithms without motion compensation (MOCO) and the efficiency of point-by-point MOCO algorithms for multiple-receiver synthetic aperture sonar (SAS) with azimuth-invariant six-degree of freedom (DOF) motion errors, an azimuth-invariant MOCO and imaging chirp scaling (CS) algorithm is presented in this paper. Taylor series approximation is used to process the range history in double square root form, while considering the fourth-order and inner terms with respect to the azimuth time. Using the method of series reversion and Fourier transform (FT) properties, the analytical two-dimensional frequency spectrum of the point target response of each receiver is derived. On this basis, the azimuth-invariant MOCO and imaging CS algorithm is proposed for six-DOF motion error compensation and multiple-receiver SAS imaging. Because it considers the azimuth-invariant six-DOF motion errors, the proposed algorithm has better imaging quality than conventional imaging algorithms without MOCO. Additionally, it has a significantly higher efficiency than point-by-point MOCO algorithms because the CS algorithm is a fast FT-based algorithm and does not require interpolation processing. The imaging simulation and experimental results verified the effectiveness and efficiency of the proposed algorithm.

关键词： Imaging Synthetic aperture sonar Receivers chirp modulation Transmitters Approximation algorithms Taylor series Underwater communication Sonar navigation Sonar equipment chirp scaling algorithm motion compensation series reversion synthetic aperture sonar underwater imaging technology

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A chirp scaling algorithm based on the method of series reversion for bistatic SAR

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ELECTRONICS LETTERS 2022年第25期58卷 999-1001页

作者： Wu, Haoran Cha, Hao Ning, Mingqiang Zhang, Peng Naval Univ Engn Wuhan Hubei Peoples R China

For the problem that the existing chirp scaling algorithm based on the method of series reversion (MSRCSA) needs to approximate the range cell migration (RCM) into a linear term of range and causes a larger range cell migration correction (RCMC) error, we propose an improved MSRCSA, which is able to focus azimuth-variation bistatic SAR. Firstly, to avoid the linear approximation for RCM, this paper derives a new curvature factor varying with the azimuth frequency and range, utilizing to describe RCM without any approximation. Secondly, since the new curvature factor is different with the traditional curvature factor varying only with the azimuth frequency, a new scaling function is given to modulate the echo signal so that the required range-variant RCMC shift can be implemented by using phase multiplies. Thirdly, the proposed MSRCSA is implemented by utilizing three phase multiplications and four fast Fourier transforms (FFTs). Finally, the good performance of the proposed MSRCSA is examined by comparing the imaging result of the proposed MSRCSA with that of the existing MSRCSA.

关键词： improved MSRCSA scaling function echo signal range-variant RCMC shift series reversion echo bistatic SAR linear approximation chirp scaling algorithm larger range cell migration correction error azimuth-variation bistatic SAR traditional curvature factor fast Fourier transforms phase multiplies synthetic aperture radar RCM azimuth frequency radar signal processing

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Improved chirp scaling algorithm for Processing Squinted Mode Synthetic Aperture Sonar Data

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CYBERNETICS AND INFORMATION TECHNOLOGIES 2016年第6期16卷 111-122页

作者： Fan, Naiqiang Wang, Yingmin Lv, Yarong Northwest Ploytech Univ Engn Practice Training Ctr Xian Peoples R China Northwest Ploytech Univ Sch Marine Sci & Technol Xian Peoples R China Northwest Ploytech Univ Ming De Coll Xian Peoples R China

The conventional chirp scaling algorithm is mainly used in side looking or small squint angle mode of synthetic aperture imaging. In application of synthetic sonar, the large squint angle imaging is often required and the range-azimuth coupling is serious. On the basis of studying the principle of the conventional chirp scaling algorithm, we improved the imaging algorithm in large squint mode. We analysed the structure of the echo frequency spectrum and the compensation of phase factor. The improved imaging algorithm designs a more precision of phase compensation factor, and eliminates the high order degree of range and azimuth coupling in the specific mapping band. Any target point is simulated in imaging region by using the improved algorithm. The simulation conclusion showed that the improved chirp scaling algorithm is able to meet the imaging focus and is more suitable to slant imaging as compared with the traditional algorithm.

关键词： Synthetic aperture sonar chirp scaling algorithm range-azimuth coupling secondary range compression Taylor series Fresnel assumption

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Focusing bistatic forward-looking synthetic aperture radar based on modified Loffeld's bistatic formula and chirp scaling algorithm

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JOURNAL OF APPLIED REMOTE SENSING 2014年第1期8卷 083586-1-083586-12页

作者： Ma, Chao Gu, Hong Su, Weimin Li, Chuanzhong Chen, Jinli Nanjing Univ Sci & Technol Inst Elect Engn & Optoelect Technol Nanjing 210094 Jiangsu Peoples R China Nanjing Univ Informat Sci & Technol Inst Elect & Informat Engn Nanjing 210044 Jiangsu Peoples R China

A focusing solution for bistatic forward-looking synthetic aperture radar (BFSAR) is presented. Forward-looking imaging is highly desirable in some potential applications, such as self-landing in bad weather, military surveillance, and navigation. Unfortunately, monostatic synthetic aperture radar reaches its limit when it is used in a forward-looking configuration. BFSAR can provide a high-resolution image in the forward-looking direction. However, due to the special forward-looking geometry, many proposed methods of deriving a bistatic point target reference spectrum (BPTRS) cannot handle the BFSAR data well. A modified Loffeld's bistatic formula (MLBF) for a forward-looking configuration is proposed first;it can get an accurate BPTRS of BFSAR. Then, a chirp scaling algorithm (CSA) based on MLBF is derived. CSA without interpolation allows high performance. Numerical simulations show that the proposed focusing solution can handle the BFSAR data well and achieve a high-resolution focused image. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

关键词： bistatic forward-looking synthetic aperture radar modified Loffeld's bistatic formula chirp scaling algorithm

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An Efficiency Imaging algorithm for the Multiple receivers Data in Synthetic Aperture Sonar 14

An Efficiency Imaging Algorithm for the Multiple receivers D...

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14th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Wu, Haoran Tang, Jinsong Naval Univ Engn Naval Inst Underwater Acoust Technol Wuhan Peoples R China

ISBN: (纸本)9781665400046

For the problem of the low computational efficiency in the existing CSA based on MSR for the multiple-receiver SAS because it is required to perform image reconstruction for each receiver, an efficiency CSA based on MSR for the multiple-receiver SAS is proposed in this paper. Firstly, to make that the range cell migration, azimuth modulation, and range modulation of different receiver can be represented by that of the reference receiver, the signal of each receiver is shifted to the same shortest range. Secondly, to obtain the imaging result by performing one imaging reconstruction, the multiple receivers signal shifted is transformed into the monostatic signal by azimuth reconstruction. Thirdly, the imaging reconstruction based on MSR's 2D spectrum is derived by utilizing the chirp scaling principle. Finally, the effectiveness of the proposed algorithm is validated by the simulation experiments.

关键词： synthetic aperture sonar chirp scaling algorithm method of series reversion

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chirp scaling algorithm for GEO SAR based on fourth-order range equation

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ELECTRONICS LETTERS 2012年第1期48卷 41-U115页

作者： Bao, M. Xing, M. D. Li, Y. C. Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Shaanxi Peoples R China

For a synthetic aperture radar (SAR) onboard a geosynchronous-earth-orbit (GEO) satellite, the track can be curvilinear. Thus, the validity of imaging algorithms based on the conventional hyperbolic range equation (CHRE) becomes questionable. A fourth-order range equation is adopted to improve the accuracy in the approximation of the range history for GEO SAR and a modified chirp scaling algorithm (CSA) is proposed. Simulation results show that the presented algorithm has better performance than the CHRE-based CSA in the GEO case, implying good application prospects.

关键词： GEO SAR artificial satellites chirp scaling algorithm conventional hyperbolic range equation fourth-order range equation geosynchronous-earth-orbit satellite hyperbolic equations imaging algorithm radar imaging spaceborne radar synthetic aperture radar synthetic aperture radar

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High-resolution imaging for the multireceiver SAS

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JOURNAL OF ENGINEERING-JOE 2019年第19期2019卷 6057-6062页

作者： Zhang, Xuebo Ying, Wenwei Dai, Xuntao Underwater Acoust Antagonizing Lab Middle Renmin Rd Zhanjiang Peoples R China Naval Res Acad Beijing Peoples R China Grp Corp 10 Res Inst Chengdu 610036 Sichuan Peoples R China

The area coverage rate is dramatically improved by using the multireceiver technique. However, this configuration leads to the complexity of the synthetic aperture image formation. In order to solve this issue, the target based on the phase centre approximation (PCA) is to be reconstructed. The data related to the multireceiver SAS system is coerced into the data like traditional monostatic synthetic aperture sonar (SAS) system. Then, the data can be processed by traditional imaging methods. In this paper, the chirp scaling algorithm is exploited as an example. Moreover, the influence of some important steps with the monostatic conversion, i.e. pulse compression in the range dimension and the micro range cell migration correction (RCMC), is further discussed in detail. The simulations show that the presented method can focus the target well.

关键词： synthetic aperture sonar image resolution approximation theory pulse compression sonar imaging acoustic receivers traditional imaging methods chirp scaling algorithm monostatic conversion microrange cell migration correction high-resolution imaging area coverage rate multireceiver technique synthetic aperture image formation phase centre approximation PCA multireceiver SAS system traditional monostatic synthetic aperture sonar system data processing pulse compression range dimension

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Design for the system of high-speed data transmission and data pre-processing for synthetic aperture radar imaging based on the system-on-a-programmable-chip

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JOURNAL OF ENGINEERING-JOE 2019年第20期2019卷 6537-6540页

作者： Hu, Shankang Liu, Xiaoning Xie, Yizhuang Hu, Shanqing Li, Bingyi Beijing Inst Technol Sch Informat & Elect Radar Res Lab Beijing 100081 Peoples R China Beijing Inst Technol Beijing Key Lab Embedded Real time Informat Proc Beijing 100081 Peoples R China DFH Satellite Co Ltd Beijing 100081 Peoples R China

For the chirp scaling algorithm of synthetic aperture radar imaging, an efficient transmission of a large volume of data is indispensable. Prior to imaging, there is a requirement for appropriate pre-processing of the echo signal by digital down conversion (DDC). The DDC module has to remove the carrier, having an appropriate filtering processing and down-sampling processing. No matter what imaging mode is chosen, such as the stripmap mode, spotlight mode, and sliding spotlight, the needs of the whole imaging system are matched by setting a series of configurations about this pre-processing module and this transmission module. The system-on-a-programmable-chip constituted by the Advanced RISC Machine and field programmable gate array (FPGA) is the perfect experimental platform to test the performance of this system. Some of the algorithms, which are more feasible for this specific project for pre-processing in Maltab, were transplanted to FPGA using the VHSIC Hardware Description Language for functional verification. Finally, the processing results in Matlab were compared with this system to find the difference. At the same time, the time that elapsed from the 2 GB original data entering the system to the time the processed results were completely returned to the PC was also counted.

关键词： radar imaging synthetic aperture radar system-on-chip field programmable gate array transmission module pre-processing module imaging system spotlight mode stripmap mode down-sampling processing DDC module chirp scaling algorithm system-on-a-programmable-chip synthetic aperture radar imaging data pre-processing high-speed data transmission

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Improved chirp scaling algorithm integrated motion compensation for parallel-track bistatic synthetic aperture radar

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Journal of Beijing Institute of Technology 2011年第4期20卷 536-539页

作者：齐春东曾涛李枫 School of Information and Electronics Beijing Institute of Technology

To compensate motion errors of images from the parallel-track bistatic synthetic aperture radar（BiSAR）,an improved chirp scaling algorithm（CSA） is *** velocity vector of the moving aircrafts in the parallel-track BiSAR system can not remain invariant in an aperture,an actual aperture is divided into subapertures so that it is reasonable to assume that the aircrafts move with constant acceleration vector in a *** on this model,an improved CSA is *** new phase factors incorporate three-dimensional acceleration and *** motion compensation procedure is integrated into the CSA without additional operation *** simulation results show that the presented algorithm can efficiently resolve motion compensation for parallel-track BiSAR.

关键词： chirp scaling algorithm parallel-track bistatic synthetic aperture radar motion compensation

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