Abstract: Interferometric Cartwheel is an important satellite configuration for spaceborne InSAR system.The baselines between multi-satellites can be used for interferometric height measurement,and then high-precision DEM can be generated through parameter calibration.In this paper,the parameter relations between different interferometric platforms are firstly given from the geometric configuration of Cartwheel.Then,based on accurate inter-satellite distance measurement,the relations of system parameters are introduced to the calibration equations of all interferometric platforms,and the united multi-platform calibration algorithm is proposed.Using the redundant information of Cartwheel configuration,this algorithm can not only fix all system parameters within one scaling procedure,but also reduce the realization requirements of ground control points.The simulation results indicate that this algorithm can provide better parameter calibration with accurate topographic elevation.