Design And Implementation Of Multisystem Spaceborne SAR/InSAR/DInSAR Echo Simulation Software

Microwave remote sensing technology has the advantage of all-day and all-weather observation of the ground.In military applications,it can identify and monitoring targets,and in civil applications,it can be applied to disaster monitoring,topographic mapping and resource survey.With the expansion of application range and the improvement of SAR performance,spaceborne SAR systems of various systems are emerging.In order to make the spaceborne SAR system carry out the preset work effectively,it is necessary to fully verify the guarantee of system parameters to performance indexes through digital simulation experiments during the satellite development process.Therefore,it is very important to develop a set of spaceborne SAR/InSAR/ DInSAR simulation software which can simulate multi-system echo efficiently and accurately,so as to meet the requirements of performance analysis and parameter optimization design of remote sensing system.Based on the basic theory of multi-system spaceborne SAR/InSAR/DInSAR system,this thesis introduces the design and implementation of each module of multi-system spaceborne SAR/InSAR/DInSAR echo simulation software in detail.The main research contents and innovation points are as follows:1.In order to solve the problems of mutual coupling and complex working mechanism of different working systems,such as multi-channel,multi-spaceborne platform,multi-imaging mode and multi-sail.In this thesis,the management mode of spaceborne SAR/InSAR/DInSAR echo simulation software is designed based on the nested one-to-many management mode,and the engineering information management of the echo simulation software is realized.In this thesis,a scheme for determining the simulation system is proposed,that is,using CTree Ctrl control nodes to control sails,satellites,antennas,transmitters and receivers,and the simulation tasks of software in different systems are realized.2.Aiming at the problem of complex parameters of different SAR systems,this thesis proposes a scheme of one-key parameter file import based on workflow automation before simulation.The scheme uses the input of external parameter file,reads the file information and connects the information with the software,and realizes a series of automatic processes from the creation of the sail management window,the addition of each node,the generation of background satellite system parameter file to the display of the final radiation scene.This scheme not only greatly simplifies the software operation,but also ensures the flexibility and high efficiency of software parameter input.3.In order to solve the problem of adding surface deformation quantity accurately in differential interferometric SAR echo simulation,this thesis proposes a ground deformation field acquisition scheme based on interpolation of target shape variables of regular/irregular distribution points.In this scheme,the deformation rates of the point targets added in batches are calculated by means of polynomial fitting in the repeated passage,then the deformation rates of the calculated point targets are integrated with the time of the repeated passage to obtain the deformation quantity,and finally the scene deformation quantity are obtained by interpolating the deformation quantity of the point targets.4.Aiming at the simulation requirements of multi-system spaceborne SAR,a unified simulation process of multi-system spaceborne SAR/InSAR/DInSAR based on burst simulation was designed and implemented.The spaceborne SAR echo simulation of traditional operating system(e.g.,strip SAR)degenerates into a special case of burst simulation scheme.In this scheme,the method of intelligentized tree list identification was used to carry out electromagnetic modeling and echo calculation for selected burst in turn,and the function of electromagnetic modeling and echo simulation for any selected burst was realized.5.The echo calculation method in the none "stop-go" mode is integrated.The implementation and the coordination control of the multi-system spaceborne SAR/InSAR/DInSAR echo simulation software are completed.In order to evaluate the simulation performance of the software,the performance was verified and the indicators were evaluated for the multi-imaging mode,multi-channel and multi-sail spaceborne echo simulated by the software.Finally,the performance evaluation results show the effectiveness of the echo simulation software.