Inverse synthetic aperture sonar (ISAS) can obtain the image of a moving underwater vehicle (UV) with both high range resolution and high cross-range resolution. Existing ISAS imaging methods are based on the translational motion of the UV. Since a real UV also does 3-D rotations, these methods suffer from defocusing especially in severe sea condition. Hence, a novel ISAS imaging method utilizing the 3-D rotations is proposed in this paper. Under the 3-D rotational model, the echo in slow time is simplified as an amplitude modulated-cubic phase signal (AM-CPS), and a high precision signal parameter estimation algorithm based on the Radon transform cubic phase function is presented to process the AM-CPS. Moreover, the image plane is analyzed. The result shows that the ISAS imaging method based on the 3-D rotations can obtain the target's images on more image planes compared with the translational motion based methods, and the image quality is improved compared with other signal parameter estimation algorithms. The simulation verifies the effectiveness of the proposed method.

中文翻译：

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利用 3-D 旋转对水下航行器进行逆合成孔径声纳成像

逆合成孔径声纳 (ISAS) 可以获得具有高距离分辨率和高横向分辨率的移动水下航行器 (UV) 图像。现有的 ISAS 成像方法基于紫外线的平移运动。由于真正的 UV 也会进行 3D 旋转，因此这些方法会出现散焦问题，尤其是在恶劣的海况下。因此，本文提出了一种利用 3-D 旋转的新型 ISAS 成像方法。在3维旋转模型下，将慢时回波简化为调幅三次相位信号(AM-CPS)，提出一种基于Radon变换三次相位函数的高精度信号参数估计算法来处理回波。 AM-CPS。此外，图像平面被分析。结果表明，基于3维旋转的ISAS成像方法能够获得目标' 与基于平移运动的方法相比，在更多图像平面上的图像，并且与其他信号参数估计算法相比，图像质量有所提高。仿真验证了所提出方法的有效性。