Using an Equivalence-Based Approach to Derive 2-D Spectrum of BiSAR Data and Implementation Into an RDA Processor
Using an Equivalence-Based Approach to Derive 2-D Spectrum of BiSAR Data and Implementation Into an RDA Processor
复制标题
使用基于等价的方法导出 BiSAR 数据的二维频谱并在 RDA 处理器中实现
DOI：
10.1109/tgrs.2020.3011420
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发表时间：
2021
影响因子：
8.2
通讯作者：
Han Liang
中科院分区：
文献类型：
--
作者：
Xiong Tao;Li Yachao;Li Qi;Wu Ke;Zhang Lili;Zhang Yingxian;Mao Shasha;Han Liang
提出了一种由单站等效分量和双站合成孔径雷达（BiSAR）补偿分量组成的等效距离方程。在两个组件中有五个单站等效参数（MEP）。利用MEP，可以以类似于单站SAR（MoSAR）表达式的形式来表示BiSAR距离方程。然后，利用距离方程和稳相原理（POSP），解析推导了点目标的二维频谱，并将其应用到处理平移不变（TI）BiSAR数据的距离多普勒算法（RDA）中。在我们的RDA中，空间变化的距离单元迁移（RCM）校正和方位压缩（AC），这两者都是与空间变化的MEP相关的，需要聚焦不同距离单元的整个场景中的所有目标。在较宽的成像参数范围内进行了仿真，以评估等效距离方程和二维谱。获得了满意的结果。此外，传统的运动补偿方法可以直接应用到我们的等效距离方程。最后，通过分析获得的原始BiSAR数据的RDA进行评估。获得聚焦良好的图像。因此，建议的等效距离方程，推导出的2-D频谱，和RDA已被验证使用原始的BiSAR数据形成图像。
An equivalent range equation with a monostatic equivalent component and a bistatic synthetic aperture radar (BiSAR) compensation component was proposed. There were five monostatic equivalent parameters (MEPs) in the both components. With the MEPs, a BiSAR range equation can be expressed in a form similar to the monostatic SAR (MoSAR) expression. Then, by using the range equation and the principle of stationary phase (POSP), we analytically derive the 2-D spectrum of a point target, and this 2-D spectrum is implemented into the range Doppler algorithm (RDA) that processes the translational invariant (TI) BiSAR data. In our RDA, spatially variant range cell migration (RCM) correction and azimuth compression (AC), both of which are related to the spatially variant MEPs, are required to focus all targets in the whole scene of different range cells. Simulations under a wide range of imaging parameters are conducted to assess the equivalent range equation and the 2-D spectrums. Satisfactory results are obtained. In addition, traditional methods for motion compensation can be directly applied to our equivalent range equation. Finally, the RDA is evaluated through the analysis of acquired raw BiSAR data. Well-focused images are obtained. Therefore, the proposed equivalent range equation, derived 2-D spectrum, and RDA have been validated for forming imagery using raw BiSAR data.