Abstract:

The projected Landweber (PL) algorithm is competent for passive millimeter wave (PMMW) imaging for its spectrum extrapolation performance and low signal to noise ratio images processing ability, however, the slow speed of convergence and the computation instability limit its applications in real time. A projected Newton Landweber (PNL) algorithm is proposed to achieve real time ability on the basis of the PL algorithm. Firstly, a fast Newton inversion algorithm is introduced to get coarse image recovery. Then the PL algorithm is used to get refined image recovery. Experimental results demonstrate that the performance of the PNL algorithm approaches that of the PL algorithm, moreover the computation is stable and far less than the PL algorithm.