基于最小二乘估計(jì)的InISAR空間目標(biāo)三維成像方法
doi: 10.11999/JEIT151000
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61171122, 61201318, 61501011, 61501012)
Interferometric ISAR Imaging for 3-D Geometry of Uniformly Rotating Targets Based on Least Squares Estimation Method
Funds:
The National Natural Science Foundation of China (61171122, 61201318, 61501011, 61501012)
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摘要: InISAR系統(tǒng)能夠在短觀測(cè)時(shí)間內(nèi)實(shí)現(xiàn)對(duì)目標(biāo)的3維成像,在目標(biāo)識(shí)別和分類中有廣泛應(yīng)用。但是ISAR成像平面不僅取決于目標(biāo)相對(duì)雷達(dá)的空間位置,還和目標(biāo)的運(yùn)動(dòng)情況有關(guān)。針對(duì)空間平穩(wěn)運(yùn)動(dòng)目標(biāo),該文利用互相垂直的L型基線構(gòu)成雙通道InISAR系統(tǒng),對(duì)各天線接收到的回波分別采用各自的參考距離進(jìn)行聚焦處理,采用傳統(tǒng)的距離-多普勒算法得到目標(biāo)散射點(diǎn)2維像,通過(guò)提取各散射點(diǎn)的干涉相位和多普勒信息,采用最小二乘方法對(duì)目標(biāo)的有效轉(zhuǎn)動(dòng)角速度大小和方向進(jìn)行估計(jì),進(jìn)而估計(jì)出散射點(diǎn)的3維位置,實(shí)現(xiàn)目標(biāo)3維成像。仿真實(shí)驗(yàn)驗(yàn)證了所提方法的有效性和魯棒性。
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關(guān)鍵詞:
- 干涉逆合成孔徑雷達(dá) /
- 平穩(wěn)運(yùn)動(dòng)目標(biāo) /
- 3維成像 /
- 最小二乘估計(jì) /
- 角速度估計(jì)
Abstract: Interferometric Inverse Synthetic Aperture Radar (InISAR) images are widely used for 3-D reconstruction of maneuvering targets in a short observation time. InISAR system is always used for target classification and recognition. Nevertheless, the image plane depends on the targets own motions and its relative position with respect to the radar. To overcome this problem, this paper proposes an InISAR system containing two baseline perpendicular to each other. The echo signal received by each antenna is focused by the respective reference range. The target angular velocity and Euler angle are estimated by using the interferometric phase with the least square method. Then, the scatterers 3-D coordinates are estimated. Simulation experiments show the effectiveness and robustness of the proposed method. -
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