基于偽逆極坐標(biāo)傅里葉變換的快速ISAR方位定標(biāo)

李東; 張成祥; 趙迪; 譚曉衡; 周喜川; 占木楊

doi:10.11999/JEIT180299

基于偽逆極坐標(biāo)傅里葉變換的快速ISAR方位定標(biāo)

doi: 10.11999/JEIT180299

李東^{1, 2, ,},
張成祥¹,
趙迪²,
譚曉衡³,
周喜川³,
占木楊¹

1.
重慶大學(xué)通信與測控中心 ??重慶 ??400044
2.
上海衛(wèi)星工程研究所 ??上海 ??200240
3.
重慶大學(xué)通信工程學(xué)院 ??重慶 ??400044

基金項(xiàng)目: 國家自然科學(xué)基金(61501068, 61571069)，上海航天科技創(chuàng)新基金(SAST2017041)，廣西無線寬帶通信與信號(hào)處理重點(diǎn)實(shí)驗(yàn)室2017年主任基金(GXKL06170202)，重慶市基礎(chǔ)研究與前沿探索項(xiàng)目(cstc2018jcyjAX0351)

詳細(xì)信息

作者簡介:
李東：男，1983年生，副教授，研究方向?yàn)镾AR/ISAR成像算法設(shè)計(jì)、參數(shù)估計(jì)等

張成祥：男，1990年生，碩士生，研究方向?yàn)镮SAR成像算法設(shè)計(jì)以及參數(shù)估計(jì)

趙迪：男，1982年生，高級(jí)工程師，研究方向?yàn)槔走_(dá)信號(hào)處理

譚曉衡：男，1976年生，教授，研究方向?yàn)樾盘?hào)檢測與估計(jì)

周喜川：男，1983年生，教授，研究方向?yàn)橹悄苄盘?hào)處理

占木楊：男，1991年生，碩士生，研究方向?yàn)镮SAR成像算法設(shè)計(jì)

通訊作者:
李東　lidongcuit@126.com

中圖分類號(hào): TN957
計(jì)量
- 文章訪問數(shù): 1785
- HTML全文瀏覽量: 1130
- PDF下載量: 70
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2018-03-30
- 修回日期: 2018-08-13
- 網(wǎng)絡(luò)出版日期: 2018-09-03
- 刊出日期: 2019-02-01

Fast Cross-range Scaling for ISAR Imaging Based on Pseudo Polar Fourier Transform

1.
Center of Communication and Tracking Telemetering Command, Chongqing University, Chongqing 400044, China
2.
Shanghai Satellite Engineering Research Institute, Shanghai 200240, China
3.
College of Communication Engineering, Chongqing University, Chongqing 400044, China

Funds: The National Natural Science Foundation of China (61501068, 61571069), The Shanghai Aerospace Science and Technology Innovation Fund (SAST2017041), 2017 Director Fund of Key Laboratory of Wireless Broadband Communication and Signal Processing in Guangxi (GXKL06170202), The Chongqing Research Program of Basic Research and Frontier Technology (cstc2018jcyjAX0351)

摘要

摘要:
在逆合成孔徑雷達(dá)(ISAR)成像中，由距離多普勒或時(shí)頻分析方法得到的ISAR圖像方位向僅是目標(biāo)的多普勒頻率分布，不能反映目標(biāo)的真實(shí)形狀，需對(duì)ISAR圖像進(jìn)行方位定標(biāo)。該文提出一種快速的ISAR方位定標(biāo)方法來估計(jì)目標(biāo)的旋轉(zhuǎn)角速度(RAV)。首先，該方法利用高效的偽逆極坐標(biāo)快速傅里葉變換把兩幅不同時(shí)刻ISAR圖像的旋轉(zhuǎn)運(yùn)動(dòng)轉(zhuǎn)化為沿極角的平移運(yùn)動(dòng)。然后，在極坐標(biāo)域定義了一種新的積分相關(guān)代價(jià)函數(shù)來粗估目標(biāo)的RAV。最后，通過采用二分法估計(jì)得到最優(yōu)的RAV，進(jìn)而實(shí)現(xiàn)ISAR方位定標(biāo)。相比于現(xiàn)有方位定標(biāo)算法，所提方法避免了插值操作帶來的精度損失和高計(jì)算復(fù)雜度問題。計(jì)算機(jī)仿真和實(shí)測數(shù)據(jù)實(shí)驗(yàn)結(jié)果證明了所提方法的有效性。
- 逆合成孔徑雷達(dá) /
- 旋轉(zhuǎn)角速度 /
- 偽逆極坐標(biāo)快速傅里葉變換 /
- 二分法
Abstract:
For the Inverse Synthetic Aperture Radar (ISAR) imaging, the ISAR image obtained by the Range-Doppler (RD) or time-frequency analysis methods can not display the target's real shape due to its azimuth relating to the target Doppler frequency, thus the cross-range scaling is required for ISAR image. In this paper, a fast cross-range scaling method for ISAR is proposed to estimate the Rotational Angular Velocity (RAV). Firstly, the proposed method utilizes efficient Pseudo Polar Fast Fourier Transform (PPFFT) to transform the rotational motion of two ISAR images from two different instant time into translation in the polar angle direction. Then, a new cost function called integrated correction is defined to obtain the RAV coarse estimation. Finally, the optimal RAV can be estimated using the Bisection method to realize the cross-range scaling. Compared with the available algorithms, the proposed method avoids the problems of precision loss and high computational complexity caused by interpolation operation. The results of computer simulation and real data experiments are provided to demonstrate the validity of the proposed method.
- Inverse Synthetic Aperture Radar (ISAR) /
- Rotational Angular Velocity (RAV) /
- Pseudo Polar Fast Fourier Transform (PPFFT) /
- Bisection method

HTML全文

圖 1 ISAR成像的幾何模型示意圖

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圖 2 偽逆極坐標(biāo)采樣網(wǎng)格

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圖 3 偽逆極坐標(biāo)采樣區(qū)域${P_1}$的2維傅里葉變換快速實(shí)現(xiàn)示意圖

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圖 4 提出的ISAR方位定標(biāo)算法實(shí)現(xiàn)流程圖

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圖 5 兩個(gè)不同時(shí)刻得到的RD圖像

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圖 6 粗估的1維相關(guān)曲線

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圖 7 迭代收斂曲線

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圖 8 方位定標(biāo)后的ISAR圖像

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圖 9 RAV估計(jì)的均方根誤差隨信噪比變化曲線

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圖 10 實(shí)測數(shù)據(jù)圖像

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表 1 雷達(dá)參數(shù)和目標(biāo)運(yùn)動(dòng)模型

參數(shù)	數(shù)值
載波頻率	5.6 GHz
波長	0.0536 m
傳輸信號(hào)帶寬	400 MHz
距離采樣頻率	512 MHz
脈沖重復(fù)頻率	150 Hz
有效回波脈沖	600
旋轉(zhuǎn)角速度	0.0436 rad/s

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表 2 兩種方法運(yùn)行時(shí)間對(duì)比(s)

方法名稱	粗估所用時(shí)間	定標(biāo)總時(shí)間
文獻(xiàn)[11]方法	107.224	958.659
本文方法	12.203	96.712

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參考文獻(xiàn)(15)

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