Constructing the 2D Radio Images of Objects with the Use of Multifrequency Signals with Coded Carrier-Frequency Hopping(Costas signals)

摘要

-An approach to constructing radial Doppler 2D radio images (RIs), in which the synthetic aperture method is applied to multifrequency signals with Costas-coded hopping of carrier frequencies, is investigated. The case of completely coherent signals and the case of their strong phase distortions have been discussed. Side lobe level suppression method based on multiplicative processing of 2D RIs constructed with the use of different frequency codes is proposed. Selection of code bases ensuring minimization of the side lobes level of the resulting 2D RI has been substantiated. The results simulation based on mathematical bright points are presented.