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.