摘要
针对水中目标逆合成孔径成像问题,建立了转向(旋转)运动目标的信号模型,研究提出了频域反向投影和等效圆周合成孔径2种逆合成孔径成像方法。理论和仿真分析表明:频域反向投影法的原理清晰,易实现,成像质量较高;等效圆周合成孔径法利用双线性内插和快速傅里叶变换,在逆合成孔径大小少量损失的情况下,有效提高了计算效率。
Aimed at inverse synthetic aperture imaging of objects in the water,in this paper,the signal model of rotating objects is constructed,and two inverse synthetic aperture imaging methods are proposed,i.e.frequency domain backprojection method and the equivalent circular synthetic aperture method.Theoretical and simulation results show that,the first method is straightforward in principle,and implemented simply with good imaging quality.The second method which utilizes the bilinear interpolation and the fast Fourier transform operations,can effectively improve the computational efficiency with the inverse synthetic aperture size be suffered a little.
出处
《舰船科学技术》
北大核心
2012年第10期69-72,76,共5页
Ship Science and Technology
基金
国家自然科学基金资助项目(60902071)
关键词
转向目标
逆合成孔径
坐标映射
双线性内插
rotating objects
inverse synthetic aperture
coordinate mapping
bilinear interpolation
