| In recent years,distributed simulation has been developing in a large scale,which is reflected in the explosive growth of the types and quantities of participate entities in simulation.LVC is refer to the simulation combined live、virtual and constructive entities,which can meet the requirement of a variety of participants,and the multi-resolution simulation can balance the simulation scale and resolution,providing a solution for the current military simulation strategy—wide area against and local high resolution simulation,this paper mainly studies the multi-resolution problems based on LVC system consist of HLA and DDS.The specification of the model is the bridge between modeling and simulation,and the good description specification is helpful for the rapid construction of simulation system and the reuse of the model.Based on the existed multi-resolution description,considering the real-time simulation requirements of real entity,we proposed the improved LVC multi-resolution description specification,which is proved be a coupling closed structure and have dynamic characteristics.For the problem of aggregation and disaggregation in multi-resolution modeling,firstly,we considered the problems that need to be solved before aggregation and disaggregation,proposed determining method for aggregation model and disaggregation model,emphasizes the importance of professional staff’s participant;in the aspect of the selection of aggregation and disaggregation time,we analysis the classical resolution trigger conditions,put forward a dynamic aggregation and disaggregation based on contribution degree of current resolution,which not only achieved the integration of multiple resolution switching conditions,but also the resolution can be changed automatically based on resource consumption.In addition,the improved solution for some problems which produced in the process of aggregation and disaggregation is proposed,we put forward the information compensation strategy based on attribute classification for transient inconsistency;for the problem of conversion delay,first consider aggregate and disaggregate ahead,for the switch conditions that cannot be predicted in advance,in order to avoid cross resolution inter,the model receive interaction with its pseudo aggregation and disaggregation model and mapping to current resolution model again;for frequent aggregation and disaggregation problems we propose normalization the resolution switching condition and pseudo aggregation / disaggregation strategy based on interaction classification.To the LVC subsystem’s time inconsistency problem,the subsystems obtain the standard time by GPS time giving,the logical time in the HLA is mapped to real time to be consistent with the real time in DDS,on this basis,the time marching scheme in HLA and DDS in the simulation was proposed and message distribution mechanism was illustrated by a specific example.Based on the above theoretical research,we set the air defense simulation scenario,determined the aggregation and disaggregation model,achieved the dynamic aggregation and disaggregation based on the contribution of resolution.Experimental results showed that,the new method can achieved effectual consistency with less resource consume. |
