前視多通道合成孔徑雷達(dá)解模糊成像方法

盧景月; 張磊; 王冠勇

doi:10.11999/JEIT180177

前視多通道合成孔徑雷達(dá)解模糊成像方法

doi: 10.11999/JEIT180177 cstr: 32379.14.JEIT180177

西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室 ??西安 ??710071

基金項(xiàng)目: 國(guó)家自然科學(xué)基金(61771372, 61771367)

詳細(xì)信息

作者簡(jiǎn)介:
盧景月：男，1994年生，博士生，研究方向?yàn)楹铣煽讖嚼走_(dá)成像

張磊：男，1984年生，副教授，主要研究方向?yàn)楹铣煽讖嚼走_(dá)成像、目標(biāo)識(shí)別

王冠勇：男，1989年生，工程師，主要研究方向?yàn)楹铣煽讖嚼走_(dá)成像

通訊作者:
張磊　 775807665@qq.com

中圖分類號(hào): TN957.52
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2018-02-09
- 修回日期: 2018-07-10
- 網(wǎng)絡(luò)出版日期: 2018-07-24
- 刊出日期: 2018-12-01

Ambiguity Resolving and Imaging Algorithm for Multi-channel Forward-looking Synthetic Aperture Radar

National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China

Funds: The National Natural Science Foundation of China (61771372, 61771367)

摘要

摘要: 傳統(tǒng)合成孔徑雷達(dá)方位向分辨率僅由合成孔徑提供，但在正前視區(qū)域多普勒分集有限，成像性能迅速下降且前視成像也存在固有的左右多普勒模糊問題。針對(duì)上述問題該文討論前視多通道合成孔徑雷達(dá)系統(tǒng)模型，提出一種理想直線航跡下空域零點(diǎn)約束自適應(yīng)波束形成的成像方法，有效綜合陣列實(shí)孔徑和合成孔徑提高正前視區(qū)域的成像質(zhì)量，利用有限陣列空域自由度實(shí)現(xiàn)左右多普勒解模糊。首先對(duì)回波數(shù)據(jù)大前斜成像處理，得到左右模糊的圖像，然后進(jìn)行波束形成，將各通道圖像加權(quán)并且相干累加，實(shí)現(xiàn)左右多普勒解模糊以及方位分辨率增強(qiáng)。仿真實(shí)驗(yàn)表明空域零點(diǎn)約束自適應(yīng)波束形成的成像方法可對(duì)前視場(chǎng)景進(jìn)行高分辨成像。
- 合成孔徑雷達(dá) /
- 前視成像 /
- 方位向分辨率 /
- 多普勒模糊 /
- 波束形成
Abstract: The azimuth resolution of traditional synthetic aperture radar is only provided by synthetic aperture. However, in the forward looking area, the Doppler diversity is limited, so the imaging performance declines rapidly. And forward looking imaging also has the Doppler ambiguity problem. In this paper, an adaptive beam forming method with spatial confinement under ideal line track is proposed. The imaging quality of the positive forward region is improved effectively by combining the array of real aperture and synthetic aperture, and the Doppler solution is blurred by using the array space domain. First, the echo data is processed by High Squint SAR imaging to obtain the blurred image. Then the beam-forming is performed, weighted and coherent accumulated with each channel image, so as to resolve Doppler ambiguity and enhance the azimuth resolution. Simulation confirms the validity of the proposed approach.
- SAR /
- Forward-looking imaging /
- Azimuth resolution /
- Doppler ambiguity /
- Beam forming

HTML全文

圖 1 FLMC-SAR系統(tǒng)模型

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圖 2 算法處理流程

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圖 3 點(diǎn)目標(biāo)成像結(jié)果

下載: 全尺寸圖片幻燈片

圖 4 面目標(biāo)成像結(jié)果

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表 1 仿真參數(shù)

參數(shù)	數(shù)值	參數(shù)	數(shù)值
載頻Fc	30 GHz	脈沖重復(fù)頻率PRF	8000 Hz
信號(hào)帶寬B	55 MHz	波束方位寬度	8°
采樣帶寬Fs	64 MHz	波束俯仰寬度	22°
下壓角	20°	場(chǎng)景中心斜距Rs	7000 m
合成孔徑長(zhǎng)度	100 m	陣列實(shí)孔徑長(zhǎng)度	0.4 m

下載: 導(dǎo)出CSV

表 2 各方位點(diǎn)目標(biāo)仿真分辨率與理論分辨率對(duì)比

參數(shù)	數(shù)值	數(shù)值	數(shù)值	數(shù)值	數(shù)值
坐標(biāo)	(R₀, 3.4°)	(R₀, –3.0°)	(R₀, 2.6°)	(R₀, 2.2°)	(R₀, 1.8°)
仿真分辨率IRW(rad)	6.76E–04	7.63E–04	8.72E–04	1.13E–03	1.53E–03
理論全孔徑分辨率(rad)	7.00E–04	7.91E–04	9.09E–04	1.07E–03	1.29E–03
理論合成孔徑分辨率(rad)	7.50E–04	8.55E–04	9.94E–04	1.19E–03	1.46E–03

下載: 導(dǎo)出CSV

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