Probing the Earth's surface using coherent radar systems of different frequency ranges, located on spacecraft, compares favorably with other means of monitoring the earth's surface and objects located on it.The book consistently discusses: the technical appearance of modern radar complexes for remote sensing of the Earth from space, modern trends in the design of space-based APAA, modern trends in the creation of an element base for space-based SAR, microwave equipment based on gallium nitride devices, complex methods for calculating the parameters of radar shooting and quality parameters of radar images using space SAR, methods for improving the quality of radar images by switching to coherent ensembles of discrete-coded probing signals.SAR and radar image parameters are calculated in the book based on an integrated approach that links them with the orbital parameters of the SAR carrier spacecraft, taking into account the influence of the sphericity of the Earth and its rotation, taking into account the influence of atmospheric parameters, the characteristics of the SAR antenna, as well as individual procedures for ground-based processing of radar information.