一种时域平面扫描三维成像算法研究

提出了一种基于平面扫描模式下的三维成像时域算法。该算法在平面网格点上获取扫频幅相信息,经过相位补偿后变换到球面上,然后利用傅里叶逆变换将频域数据沿投影线转换为时域数据,对应球面的不同空间角度在投影线上作线性插值,最后通过二维角域积分获得目标的三维图像。仿真结果表明该算法聚焦效果良好。在微波暗室内构建了一套平面扫描三维成像系统,采用该算法处理后能获得高分辨率三维微波图像,成像的空间位置误差优于1 cm。

Study on three-dimensional imaging time-domain algorithm based on planar scanning mode

A three-dimensional imaging time-domain algorithm based on planar scanning mode is presented.The amplitude and phase information of the swept-frequency signal at planar grid points is obtained firstly,and then converted into the information on spherical surface through phase compensation.Inverse Fourier transform is used to transform the frequency data into time-domain data along the projection line;moreover,a linear interpolation is performed to the time-domain data on the projection lines corresponding to different spatial angles.Finally the three-dimensional image of the object is obtained through two-dimensional angle domain integral.Simulation results show that the algorithm has good focusing effect.A planar scanning three-dimensional imaging system was constructed in a microwave anechoic chamber,and microwave images with three-dimensional high resolution were obtained using the proposed time-domain algorithm.The imaging location precision is better than 1 cm.