Distributed Spaceborne SAR Echo Time Delay Fast Algorithm

In the traditional spaceborne SAR echo simulation, the echo acquisition is based on the ‘stop-go’ assumption. ‘Stop-go’ assumption is widely used in SAR data processing, which means radar sends a pulse, receives it, and then moves to the next position. Due to the high speed of the platform and the long echo time delay, the variation of slant range by the satellite motion cannot be ignored, and the echo acquisition geometry cannot be simply regarded as the "stop-go" mode. In this paper, the echo time delay error and influence under the "stop-go" assumption of spaceborne SAR echo simulation are analyzed, and a fast distributed spaceborne SAR echo time delay algorithm is proposed by analyzing the echo acquisition geometry in none "stop-go" mode.