Based On Hla Sar Launch Echo Simulation Technology

Nowadays Distributed Interactive Simulation (DIS) is one of the focuses in the simulation field, and HLA is one criterion of DIS. It is designed to facilitate the interoperability of simulation application and reusability of simulation resource. Synthetic Aperture Radar (SAR) simulation system has become an important method for design and performance evaluation of SAR system. Designing based-on-HLA SAR distributed simulation system is significant for calculation speed, interoperability and flexibility of SAR distributed simulation system. Establishment of a radar distributed simulation system can be popularized.The distributed simulation technique of SAR transmission and echo based on HLA studied in this dissertation. What is done is mainly as follows:⑴The basic concept of HLA is introduced , a general description of the HLA Interface Specification is given, and Run-Time Infrastructure (RTI) is introduced in brief who carries out HLA interface standard service.⑵Focus on the analysis of SAR signal, SAR point target echo mathematical model, and on this basis to further explore SAR distributed targets'echo.⑶Combined HLA, design a federate who calculates transmitting signal and echo. Expatiate on functions of every step of the federate's programme framework in which simulation calculation and simulation process are separated. Because of the amount data and slow calculating speed of the echo, multi-threaded technology is used for calculating echo.⑷Visual simulation technology based on Vega is discussed and SAR imaging scene is set up. Render the scene into RCS map and set up a data base by using the data from the RCS map.⑸All the federates work together, and then the whole system's test results is given. The result verifies the entire system and every federate member are designed in a right way. Minimize communications consume between sub-threads by data decomposition, so that the speed of multi-threaded echo calculation is improved. Verified transmitting signal algorithms and single-threaded echo algorithm, and the efficiency of multi-threaded echo algorithm , separately.