Based On Hla Spaceborne Sar Distributed Simulation

Advanced system simulation is pivotal for the development of spaceborne SAR construction. Establishing a novel and reliable spaceborne SAR simulation system is of vital importance and will provide an effective means for the system design and countermeasure capability evaluation of spaceborne SAR. This dissertation established a novel distributed spaceborne SAR simulation system based on the High Level Architecture(HLA).This dissertation developed a mathematical model of instantaneous sphere earth model and instantaneous circle orbit model for the geometry system between the satellite platform and the targets on earth based on the satellite platform's orbit features and SAR system's operational characteristics, unlike the traditional sphere earth model and circle orbit model. It's precise and convenient for simulation and the typical problem of azimuth compression for spaceborne SAR due to the anomalous earth shape and the satellite motion is solved through a one-by-one aperture azimuth processing way under this model.Considering the huge data and long simulating time, this dissertation employed the distributed simulation high level architecture, thus reduced the simulating time and improved the simulation efficiency through real time range compression and parallel azimuth compression carried out on two computers. At the same time, the quantity of data transmission is decreased using the declaration management provided by HLA. Time management and the FOM/SOM development are also discussed clearly in this dissertation.This dissertation implemented the spaceborne SAR simulation system based on the Federation Development and Execute Process Model (FEDEP), the design flow is discussed in detail. Finally, the system is tested using the test federation execution and the results are presented, validate the conclusions.