雙站前視低頻超寬帶SAR的快速因式分解后向投影算法成像處理

馮東; 安道祥; 謝洪途; 黃曉濤

doi:10.11999/JEIT150736

雙站前視低頻超寬帶SAR的快速因式分解后向投影算法成像處理

doi: 10.11999/JEIT150736

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61571447, 61201329)

計(jì)量
- 文章訪問數(shù): 1451
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2015-06-18
- 修回日期: 2015-12-25
- 刊出日期: 2016-04-19

Fast Factorized Back Projection Algorithm for Bistatic Forward-looking Low Frequency Ultra Wide Band SAR Imaging

Funds:

The National Natural Science Foundation of China (61571447, 61201329)

摘要

摘要: 雙站前視低頻超寬帶(UWB)SAR兼具雙站前視的復(fù)雜成像構(gòu)型和低頻UWB的強(qiáng)距離方位耦合兩個(gè)特點(diǎn)，因此極大地增加了實(shí)現(xiàn)高精度成像處理的難度。針對(duì)這個(gè)問題，該文提出一種基于快速因式分解后向投影(FFBP)算法的雙站前視低頻UWB SAR成像處理方法。首先，基于雙站前視低頻UWB SAR的成像幾何構(gòu)型和信號(hào)模型，給出了雙站前視低頻UWB SAR 原始BP算法成像的原理和流程。其次，在上述基礎(chǔ)上，推導(dǎo)了雙站前視低頻UWB SAR FFBP算法成像處理的精確相位誤差形式，并分析了相位誤差對(duì)成像處理的影響，據(jù)此建立了雙站前視低頻UWB SAR FFBP成像處理中的子孔徑和子區(qū)域劃分原則。接下來，給出了雙站前視低頻UWB SAR FFBP算法成像處理流程，并對(duì)比分析了BP算法和FFBP算法的成像效率。最后，利用仿真實(shí)驗(yàn)證明了文中所作理論分析的正確性和所提方法的有效性。
- 雙站前視合成孔徑雷達(dá) /
- 快速因式分解后向投影 /
- 低頻 /
- 超寬帶
Abstract: Bistatic forward looking low frequency Ultra Wide Band (UWB) Synthetic Aperture Radar (SAR) has both complicated imaging geometry and strong range-azimuth coupling, which increases the difficulty of high-precision imaging extremely. In order to solve this problem, this paper proposes an approach based on Fast Factorized Back Projection (FFBP) algorithm to focus the low frequency UWB Bistatic Forward-looking SAR (BFSAR) data. First, based on the imaging geometry of BFSAR, the principle and implementation of Back Projection (BP) algorithm are presented. Then, the phase error in FFBP algorithm is analyzed, and the formula of the phase error in bistatic forward looking SAR is derived. The implementation of FFBP algorithm is presented, and the computational burden of BP algorithm and FFBP algorithm are estimated and compared. Finally, the simulation experiment is progressed, and the results prove the correctness of analysis and the validity of the proposed approach.
- Bistatic Forward-looking SAR (BFSAR) /
- Fast Factorized Back Projection (FFBP) /
- Low frequency /
- Ultra Wide Band (UWB)

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參考文獻(xiàn)(23)

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