A Method for Estimating Phase Error Between DBF SAR Elevation Channels Based on Ground Control Points

The elevation multi-channel SAR can effectively solve the limitation of traditional single-channel SAR system to achieve high resolution and wide swath by using Digital Beam Forming (DBF). However, the phase error among channels will affect the imaging performance. In this paper, to address the phase error between channels of elevation multi-channel SAR, we propose to obtain the elevation difference between the known elevation information of ground control points and elevation information by interfering between reference channels and other channels, and then use the elevation difference to estimate the phase error between channels by sensitivity matrix. Finally, the effectiveness of the algorithm is verified using simulation.