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66 results on '"Xie, Hongtu"'

30. Along-track bistatic Low Frequency UWB SAR Experiment

Author

Xie, Hongtu, primary, Hu, Jun, additional, Duan, Keqing, additional, Chen, Zengping, additional, Xu, Shiyou, additional, Zhu, Nannan, additional, Xi, Bin, additional, Lin, Yiquan, additional, An, Daoxiang, additional, and Wang, Guoqian, additional

Published
2019
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31. Reduced-DOF Three-Dimensional STAP via Subarray Synthesis for Nonsidelooking Planar Array Airborne Radar.

Author

Duan, Keqing, Xu, Hong, Yuan, Huadong, Xie, Hongtu, and Wang, Yongliang

Subjects
RADAR in aeronautics, COMPUTATIONAL complexity, DOPPLER effect, AZIMUTH
Abstract

Compared with conventional two-dimensional space-time adaptive processing (2D-STAP) methods, the elevation-azimuth-Doppler three-dimensional space-time adaptive processing (3D-STAP) method has the advantage of suppressing nonstationary clutter. Thereby, it is suitable for nonsidelooking airborne radar (non-SLAR) applications. However, its huge training data requirements and computational load are often beyond radar's ability in practical clutter environments. In this correspondence, we develop a simple but efficient reduced-degree-of-freedom (DOF) 3D-STAP method that significantly reduces the required training data and the computational complexity while maintaining the suboptimal clutter suppression performance. The proposed method transforms the planar array data into linear array data in azimuth and in elevation, respectively, thereby beamforming an equivalent cross-shape array prior to STAP. In consequence, only a few spatial DOFs, including azimuth and elevation dimension, are used for STAP directly resulting in the potential advantage for nonstationary clutter suppression and drastically reducing training data requirements and computational load. Furthermore, the clutter rank estimation rules of the planar array and the transformed cross-shape array are derived, and the required elevation DOFs of the proposed method are further discussed in detail. Simulations for clutter suppression of non-SLAR show that the proposed STAP method outperforms the state-of-the-art 3D-STAP method in terms of convergence and computational complexity. [ABSTRACT FROM AUTHOR]

Published
2020
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34. Fast time domain approach for bistatic forward-looking sar imaging based on subaperture processing and local beamforming

Author

Xie, Hongtu, primary, Shi, Shaoying, additional, Li, Fuhai, additional, An, Daoxiang, additional, Xiao, Hui, additional, Xie, Chao, additional, Fang, Qunle, additional, Wang, Guangxue, additional, Wang, Libao, additional, Wang, Feng, additional, Wang, Guoqian, additional, Hang, Xiaotao, additional, and Zhou, Zhimin, additional

Published
2017
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43. Fast Factorized Backprojection Algorithm for One-Stationary Bistatic Spotlight Circular SAR Image Formation.

Author

Xie, Hongtu, Shi, Shaoying, An, Daoxiang, Wang, Guangxue, Wang, Guoqian, Xiao, Hui, Huang, Xiaotao, Zhou, Zhimin, Xie, Chao, Wang, Feng, and Fang, Qunle

Abstract

In this paper, a fast factorized backprojection (FFBP) algorithm is proposed for the one-stationary bistatic spotlight circular synthetic aperture radar (OS-BSCSAR) data processing. This method represents the subimages on polar grids in the slant-range plane instead of the ground plane, which can be accurately referenced to the tracks of both transmitter and receiver. It can not only accurately accommodate the complicated circular track including the motion error, scene topographic information, large spatial variances and significant range-azimuth coupling of the echo data, but also improve the imaging efficiency compared with the backprojection (BP) algorithm. First, OS-BSCSAR imaging geometry is provided, and then the bistatic BP algorithm for the OS-BSCSAR imaging is derived to provide a basis for the proposed FFBP algorithm. Second, based on the subaperture imaging model, the polar grids for calculating the subimages are defined, and the sampling requirements for the polar grids are derived from the viewpoint of the bandwidth, which can offer the near-optimum tradeoff between the imaging quality and the imaging efficiency. Finally, implementation and computational burden of the proposed FFBP algorithm is discussed, and then the speed-up factor of the proposed FFBP algorithm with respect to the bistatic BP algorithm is derived. Experiment results are given to prove the correctness of the theory analysis and validity of the proposed FFBP algorithm. [ABSTRACT FROM PUBLISHER]

Published
2017
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47. Efficient Raw Signal Generation Based on Equivalent Scatterer and Subaperture Processing for One-Stationary Bistatic SAR Including Motion Errors.

Author

Xie, Hongtu, An, Daoxiang, Huang, Xiaotao, and Zhou, Zhimin

Subjects
*SYNTHETIC aperture radar, *FOURIER transforms, *COMPUTER simulation, *REMOTE-sensing images, *TRANSFER functions
Abstract

This paper presents an efficient raw signal generation method based on equivalent scatterer and subaperture processing for the one-stationary bistatic synthetic aperture radar (SAR). It considers the moving platform's motion error to generate the precise raw signal for real SAR systems. First, the imaging geometry in elliptical polar coordinates is built, and then, the scene is divided into several equidistant elliptical rings. Based on the equivalent scatterer model, the approximate SAR system transfer function is derived; thus, each pulse's raw signal is calculated by the convolution of the transmitted signal and transfer function, via the fast Fourier transform (FFT). To further improve the simulation speed, the subaperture and subscene processing is used. The transfer function for the same subaperture's pluses is calculated simultaneously by the weighted sum of all subscenes' equivalent scattering coefficient in the same equidistant elliptical ring, which is performed by the nonuniform FFT (NUFFT). This method only involves the FFT, NUFFT, and complex multiplication, which means the easier operation and higher efficiency. The implementation, limitation, and evaluation of the proposed method are discussed. Simulation results are given to prove the correctness and validity of the proposed method. [ABSTRACT FROM AUTHOR]

Published
2016
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