scholarly journals An Inverse Synthetic Aperture Ladar Imaging Algorithm of Maneuvering Target Based on Integral Cubic Phase Function-Fractional Fourier Transform

Electronics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 148 ◽  
Author(s):  
Yakun Lv ◽  
Yanhong Wu ◽  
Hongyan Wang ◽  
Lei Qiu ◽  
Jiawei Jiang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Phase Function ◽  
Fractional Fourier Transform ◽  
Doppler Frequency ◽  
Synthetic Aperture ◽  
Cubic Phase ◽  
Echo Signal ◽  
Imaging Algorithm ◽  
Maneuvering Target ◽  
Cubic Phase Function

When imaging maneuvering targets with inverse synthetic aperture ladar (ISAL), dispersion and Doppler frequency time-variation exist in the range and cross-range echo signal, respectively. To solve this problem, an ISAL imaging algorithm based on integral cubic phase function-fractional Fourier transform (ICPF-FRFT) is proposed in this paper. The accurate ISAL echo signal model is established for a space maneuvering target that quickly approximates the uniform acceleration motion. On this basis, the chirp rate of the echo signal is quickly estimated by using the ICPF algorithm, which uses the non-uniform fast Fourier transform (NUFFT) method for fast calculations. At the best rotation angle, the range compression is realized by FRFT and the range dispersion is eliminated. After motion compensation, separation imaging of strong and weak scattering points is realized by using ICPF-FRFT and CLEAN technique and the azimuth defocusing problem is solved. The effectiveness of the proposed method is verified by a simulation experiment of an aircraft scattering point model and real data.

scholarly journals Radar Coherent Detection for Maneuvering Target Based on Product-Scaled Integrated Cubic Phase Function

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Jinyang Chen ◽  
Ke Jin ◽  
Shangjiang Yu ◽  
Tao Lai ◽  
Yongjun Zhao
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Phase Function ◽  
Computational Cost ◽  
Coherent Detection ◽  
Cubic Phase ◽  
Slow Time ◽  
Detection Ability ◽  
Nonuniform Fast Fourier Transform ◽  
Cubic Phase Function

This paper considers the long-time coherent detection problem for maneuvering targets with jerk motion. A novel method based on product-scaled integrated cubic phase function (PSICPF) is proposed. The main strategy of PSICPF is to estimate target’s motion parameters along the slow time for each range frequency cell. In order to eliminate the coupling terms between range frequency and slow time, the scaled nonuniform fast Fourier transform (SNUFFT) is newly defined in the integrated cubic phase function (ICPF). Then, the product operation is employed to coherently synthesize the estimation results, improve the antinoise performance, and suppress the cross terms. Finally, coherent integration is achieved via keystone transform (KT) and fold factor searching. Analysis demonstrates that the SNUFFT has the same computational complexity with nonuniform fast Fourier transform (NUFFT), and thus the PSICPF could be efficiently implemented via complex multiplications, the fast Fourier transform (FFT), and NUFFT. Detailed comparisons with other representative methods in computational cost, motion parameter estimation performance, and detection ability indicate that the PSICPF could achieve a good balance between the computational cost and detection ability. Simulations and real data processing results are presented to verify the effectiveness of the proposed method.

Inverse synthetic aperture ladar imaging based on modified cubic phase function

2021 ◽  
Vol 60 (7) ◽  
pp. 2014
Author(s):  
Si Gao ◽  
Zenghui Zhang ◽  
Wenxian Yu ◽  
Manqing Wu ◽  
Guangzuo Li
Keyword(s):  
Phase Function ◽  
Synthetic Aperture ◽  
Cubic Phase ◽  
Cubic Phase Function

scholarly journals Group Delay Dispersion Measurement From a Spectral Interferogram Based on the Cubic Phase Function

2014 ◽  
Vol 6 (6) ◽  
pp. 1-9 ◽  
Author(s):  
Chongxiang Zeng ◽  
Hongxia Zhang ◽  
Dagong Jia ◽  
Tiegen Liu ◽  
Yimo Zhang
Keyword(s):  
Phase Function ◽  
Group Delay ◽  
Group Delay Dispersion ◽  
Cubic Phase ◽  
Dispersion Measurement ◽  
Cubic Phase Function
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