Accuracy Analysis of Airborne InSAR System Based on DGPS/IMU

摘要

Accuracy analysis is the precondition of production's accuracy ensure in a system, by which it is helpful to determine the systemic performance indexs and some technical parameters in order to make the system design. In this paper, combined with the SAR imaging principles, especially on the basis of presenting the solution of DEM's three dimension coordinates in airborne InSAR system with DGPS/IMU data, the formulas of DEM precision influence caused by some errors coming from the factors such as the base line length, base line inclination, phase difference, distance from the SAR antenna to the ground target points, SAR antenna's position, center Doppler and the plane's velocity are deduced, then the main factors influencing accuracy in airborne InSAR system and the systemic realizable performance condition are analysed in order to improve the systemic precision, and then some design suggestions of the airborne InSAR system are proposed and experiments are made with the real airborne InSAR data. In the article, it indicates that the result from the methods of accuracy analysis is accordant with the statistical precision using real experimental data, and the conclusions influencing accuracy analysis are correct.