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基于改進(jìn)型快速雙線性參數(shù)估計的復(fù)雜運(yùn)動目標(biāo)ISAR成像

呂倩,  蘇濤

呂倩, 蘇濤. 基于改進(jìn)型快速雙線性參數(shù)估計的復(fù)雜運(yùn)動目標(biāo)ISAR成像[J]. 電子與信息學(xué)報, 2016, 38(9): 2301-2308. doi: 10.11999/JEIT151359
引用本文: 呂倩, 蘇濤. 基于改進(jìn)型快速雙線性參數(shù)估計的復(fù)雜運(yùn)動目標(biāo)ISAR成像[J]. 電子與信息學(xué)報, 2016, 38(9): 2301-2308. doi: 10.11999/JEIT151359
Lü Qian, SU Tao. ISAR Imaging of Targets with Complex Motion Based on the Modified Fast Bilinear Parameter Estimation[J]. Journal of Electronics & Information Technology, 2016, 38(9): 2301-2308. doi: 10.11999/JEIT151359
Citation: Lü Qian, SU Tao. ISAR Imaging of Targets with Complex Motion Based on the Modified Fast Bilinear Parameter Estimation[J]. Journal of Electronics & Information Technology, 2016, 38(9): 2301-2308. doi: 10.11999/JEIT151359

基于改進(jìn)型快速雙線性參數(shù)估計的復(fù)雜運(yùn)動目標(biāo)ISAR成像

doi: 10.11999/JEIT151359 cstr: 32379.14.JEIT151359
基金項目: 

國家自然科學(xué)基金(61271024, 61201283)，新世紀(jì)優(yōu)秀人才支持計劃(NCET-09-0630)

ISAR Imaging of Targets with Complex Motion Based on the Modified Fast Bilinear Parameter Estimation

Funds: 

The National Natural Science Foundation of China (61271024, 61201283), Program for New Century Excellent Talents in University (NCET-09-0630)

  • 摘要: 針對復(fù)雜運(yùn)動目標(biāo)的逆合成孔徑雷達(dá)(ISAR)成像中多普勒擴(kuò)散導(dǎo)致的成像質(zhì)量下降，該文在建立方位回波信號為立方相位信號(CPS)的基礎(chǔ)上，提出一種基于改進(jìn)型快速雙線性參數(shù)估計的復(fù)雜運(yùn)動目標(biāo)ISAR成像方法。該方法通過利用雙線性立方相位函數(shù)，非均勻快速傅里葉變換(NUFFT)，基于Chirp-z的尺度變換以及快速傅里葉變換(FFT)等操作，能夠快速實現(xiàn)CPS參數(shù)估計和復(fù)雜運(yùn)動目標(biāo)的ISAR成像。由于實現(xiàn)過程均采用NUFFT和FFT快速實現(xiàn)，該方法計算量小，并且雙線性操作可以保證其具有較好的抗噪聲性能和交叉項抑制性能。理論分析和仿真結(jié)果驗證了該ISAR成像算法的有效性。
    Abstract: In view of image defocus caused by Doppler frequency shift in ISAR imaging of targets with complex motion, this paper characterizes the azimuth echoes as Cubic Phase Signal (CPS) and proposes an ISAR imaging algorithm for targets with complex motion based on the modified fast bilinear parameter estimation. This algorithm can achieve parameter estimation of CPS and ISAR imaging quickly by employing the cubic phase bilinear function, NonUniform Fast Fourier Transform (NUFFT), scale transform based on Chirp-z transform and Fast Fourier Transform (FFT). The computational cost is low due to the NUFFT and FFT in implementation procedure, and bilinearity guarantees a high anti-noise performance and a good suppression on cross-terms. The theoretical analysis and simulation results demonstrate the effectiveness of the proposed ISAR imaging algorithm.
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出版歷程
  • 收稿日期:  2015-12-03
  • 修回日期:  2016-05-04
  • 刊出日期:  2016-09-19

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