Abstract:

Traditional two dimensional (2D) antenna array requires high pulse repetition frequency (PRF) to switch transmitters, when it is applied to 3D microwave imaging. Therefore, 3D imaging is gotten by the random antenna array, as a result it reduces the requirement for PRF. Besides, a reasonable plan based on the phase center approximation (PCA) is proposed to implement the random antenna array of arbitrary geometry. The back projection (BP) algorithm interpolated by the nonuniform fast Fourier transform (NUFFT) is called NUFFT BP, and achieves high precision interpolation with relatively less computational complexity. Moreover, the NUFFT BP is further accelerated by the compute unified device architecture (CUDA) parallel computing technology, named CUDA NUFFT BP. It significantly improves the execution efficiency of the BP algorithm.