Spectral Aperture Synthesis Method

The aperture synthesis systems allow imaging with high spatial resolution. These images are important for solving problems of Earth remote sensing. One of the promising directions for development of such systems is the transition to UWB spatiotemporal signals processing. This raises a number of difficulties in the physical interpretation of the main UWB radio systems characteristics due to the fact that the classical definitions were introduced with regard to the narrowband systems description. Thus, there is a need for additional research and further definition of UWB systems characteristics and parameters. Among these characteristics is the spatial-spectral sensitivity domain, which, along with the uncertainty function, determines the quality of the radio system. Unlike in radio systems for narrowband signals processing, for systems with UWB signal processing the spectral sensitivity domain depends on both temporal and spatial frequencies. Analysis of this area is complicated by the fact that the temporal and spatial frequencies in the UWB system are not divided. In this work, the physical essence of the spatial-spectral sensitivity domain was studied and it was shown how its analysis will allow to develop requirements for the choice of antenna system geometry and to justify the expediency of using the working frequency band.