Results 141 to 150 of about 467 (179)
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Classification of underwater mines by means of the FRFT and SVM
The 2010 IEEE International Conference on Information and Automation, 2010Classification by acoustic echoes analysis of buried sea mines is the main focus of this paper. Both simulation and actual experiment data show that when the active sonar transmits chirp signal, the energy of buried mines and reverberation echoes will concentrate on different fractional domain, which results the very different properties between the ...
Tingting Li, Xiukun Li, Zhi Xia
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Blurred defocused image restoration based on FRFT
Wuhan University Journal of Natural Sciences, 2007A technique for restoring the blurred image resulted from defocusing of the lens is proposed in this paper, which is based on fractional Fourier transform (FRFT). The FRFT, as a powerful tool for the analysis of time-varying signals, is closely connected with the optical imaging system.
Wentao Yang +3 more
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Improved SAR imaging algorithm using FRFT
2016 CIE International Conference on Radar (RADAR), 2016Improved Azimuth Compression with fractional fourier transform (FRFT) has been studied. Compared to using classic matched filtering technique, the image focused by FRFT has better resolutions. It has been founded that under the condition that chirp's bandwidth keeps the same, the longer pulse duration, the higher resolution of the signal after FRFT ...
Qianrong Lu, Kaizhi Wang, Xingzhao Liu
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Application of FRFT in the Detection and Parameter Estimation of Accelerating Weak Targets
2012 IEEE 12th International Conference on Computer and Information Technology, 2012The Doppler frequency spectrum of radar echo for accelerating weak targets is spread heavily, and the traditional moving target detection method is ineffective. In order to detect the accelerating weak targets and estimate their parameters, a novel radar signal processing method based on fractional Fourier transform for surveillance radar is proposed ...
Lixiao Zhan, Ziyue Tang, Zhenbo Zhu
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Optimum FrFT domain cyclostationarity based adaptive beamforming
Signal, Image and Video Processing, 2018Essentially, the observed signal of interest is buried under the clutter due to high backscatters in radar or sonar applications. The presence of colored-Gaussian stationary noise (clutter) degrades the traditional beamformers, significantly. A new adaptive beamforming technique is presented here based on the numerical selection of the fractional order.
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Robustness of fractional order for FRFT-OFDM systems
2015 IEEE International Conference on Communication Software and Networks (ICCSN), 2015Fractional Fourier transform (FRFT) has been widely used in orthogonal frequency division (OFDM) systems to combat the doubly dispersive channels. The sensitivity of the fractional order is a serious problem. In this paper, we derive the closed form of the variable order and its optimal value based on the mathematical expression in the FRFT-OFDM ...
null Pengfei Shi +3 more
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Using FRFT to estimate target radial acceleration
2007 International Conference on Wavelet Analysis and Pattern Recognition, 2007Radial acceleration of radar target is characteristic of relative motion between radar and target, and is significant for maneuvering target recognition and tracking. To estimate radial acceleration from radar echo, fractional Fourier transformation (FRFT) was used in this paper.
null Wen-Chao Du +2 more
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FRFT-Based Interference Suppression for OFDM Systems in IoT Environment
IEEE Communications Letters, 2019The OFDM technology has been widely used in 4G, 5G, and other wireless communication systems for its anti-frequency selective fading and high spectral efficiency. However, OFDM systems are very sensitive to narrowband interference (NBI). There are many existing NBI suppression algorithms for OFDM systems.
Chengwen Zhang +4 more
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Anti-jamming Performance Analysis of FRFT-OFDM
2010 First International Conference on Pervasive Computing, Signal Processing and Applications, 2010The OFDM system based on the fractional Fourier transform (FRFT-OFDM) is robust against fast-fading channel. However, the performance of anti-jamming is not analyzed. In this paper, the anti-jamming performance of the FRFT-OFDM system under multitone jamming (MTJ) and linear frequency modulated (LFM) jamming is evaluated.
Qian Yang, Ran Tao, Jia Ni
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Sea Clutter Suppression using EMD-SVD- FRFT Filtering
2019 International Conference on Control, Automation and Information Sciences (ICCAIS), 2019Sea clutter suppression is one of the major measures to improve target detection from sea clutter. Singular value decomposition-fractional Fourier transform (SVD-FRFT) filtering is conducted to suppress sea clutter without impairing the target even when the target and first-order sea clutter are mixed in the Doppler spectrum.
Wenguang Wang, Cheng Chen, Yilin Wang
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