On the in-Orbit Time Synchronization Test Method for Distributed InSAR Satellites

Abstract

This paper presents an in-orbit time synchronization test method for distributed interferometric synthetic aperture radar (InSAR). In this paper, starting from the construction planning of geometric calibration field, the test data of characteristic points are obtained by two-dimensional interpolation of SAR echo complex images, and the slant distance deviation of dual satellite SAR is calculated, so as to obtain the in-orbit test results of time synchronization. This method solves the technical problem that the time synchronization index of distributed InSAR satellite cannot be directly tested in-orbit. The test method has good adaptability, simple operation and high test accuracy, and is suitable for the time synchronization in-orbit test of distributed InSAR satellite under dual satellite (one transmitter and two receivers) system or multi satellite (one transmitter and multi receivers) system.