Medium-and-high-orbit SAR satellite antenna aperture determination method based on full-orbit traversal analysis

Abstract

The invention relates to a medium and high orbit SAR satellite antenna aperture determination method based on full orbit traversal analysis, and the method comprises the steps: calculating the relative flight speed of a satellite to the ground according to the six orbit elements of the SAR satellite; according to the image resolution and system sensitivity index requirements of an SAR satellite, a system sensitivity calculation method and a synthetic aperture time calculation method of an SAR system are utilized to deduce and obtain a calculation expression of SAR antenna gain; and substituting the relative flight speed of the satellite to the ground into the calculation expression of the SAR antenna gain to obtain the SAR antenna gain size required by the full-orbit position, then calculating the SAR antenna area required by the full-orbit position according to the SAR antenna gain, and further obtaining the antenna aperture size meeting the full-orbit position and full-beam-position system sensitivity index. According to the method, the speed time-varying characteristic of the medium and high orbit SAR satellites is met, and two image indexes, namely the image resolution and the system sensitivity of the SAR satellites, are ensured.

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