基于空间谱理论和时空两维随机辐射场的雷达成像分析-radar imaging analysis based on spatial spectrum theory and space-time two-dimensional random radiation field.docx

interacting with target. Only the differences distribution of radiation field in both time domain and airspace can meet the requirements, and its ideal model is the temporal-spatial stochastic radiation field field put forward in this paper. At this time, the scattering field is the constant targets space modulation of time-varying random radiation field. The identified targets spatial distribution information is contained within the scattering field in proportion to space-time change, so the result of association brings the spatial resolution improving significantly , which means that the imaging method is feasible based on the temporal-spatial stochastic radiation field.Based on the above about staring imaging and distributed imaging problems and solution: 1. The new concept of time-space random radiation field is put forward. Analysis shows that the radiation field statistical characteristics play key roles for targe inversion. Then high resolution imaging mechanism based on random radiation field is expounded from simulation contrast with the traditional real aperture imaging method, The feasibility analysis of temporal-spatial stochastic radiation field to relize the actual scene approximation using gabor expansion.Then the mathematical model of radom aperture-field is established, and the analytical calculation from radom aperture-field to random radiation field is completed. It shows that the particular combination of discrete point-source could from any radom aperture-field, which has important reference value conclusion for system design. 2. The space spectrum imaging principle of the distributed radar is finished. Research shows that the imaging resolution contribution is obtained by the comprehensive effect of the space characteristic and the signal characteristics (nonlinear coupling relationship), which means that the space launch function and signal bandwidth role could form good complementary relationship, and this is very important for narrow-band di