One single imaging mission of the geosynchronous orbit space borne synthetic aperture radar takes up to one thousand seconds and the heat consumption is extremely high.During the imaging process,the insertion phase of various devices of multi-channel will drift with temperature,causing the phase correlation in azimuth deteriorate and thus affecting the imaging performance of the system.To solve this problem,an on-orbit autonomous real-time temperature phase compensation strategy is represented in this paper.The temperature phase data for hundreds of devices is optimized and stored in advance,during one imaging mission,the temperature at each device will be read and used to look up and calculate the phase deviation in real time,and finally implements phase compensation through the phase shifters.This method has characteristics of flexible adaptability to multiple modes,reliability and stability in space environment,lightweight in aspect of storage and logic.Simulation and testing have verified that this method can effectively improve the imaging performance of the system with long-synthetic aperture time,and has been successfully implemented in orbits.
维普
万方数据