Research on high precision phase real-time calibration technology based on INSAR altimeter system

For the INSAR altimeter system, high precision inversion of ground elevation requires high measurement accuracy of interferometric phase. Due to the non-ideal characteristics of the hardware system and the influence of external factors such as temperature, electromagnetic interference and space radiation during the working process, the phase characteristics of the receiving link in the system will change, which is manifested as the characteristics of phase inconsistency between channels. The introduction of interference phase error will ultimately affect the high accuracy of interference measurement. In this paper, a multichannel real-time phase calibration method is proposed, which calibrates the consistency of multiple receiving links in the system through calibration links, and compensates the phase during signal processing to ensure the measurement accuracy of interference phase.