The side view angle of spaceborne synthetic aperture radar refers to the angle between radar beam and ground target. Radar baseline refers to the distance between two receiving antennas in SAR system. According to the radar principle, the side view angle of SAR is on the same plane as the radar baseline. This is because SAR system synthesizes high-resolution radar images by receiving radar echoes from different positions, and these echoes are realized by the phase difference of signals received from different positions. Therefore, in order to ensure the image quality, the side view angle of SAR and the radar baseline need to be in the same plane.