在中心炸点周围布设传感器来提取爆炸后冲击波走时,利用走时层析成像方法来重建爆炸后的冲击波超压场。实验中传感器数目不足导致重建数据不完全,这种不完全数据重建对算法要求更高。文中提出了4种重建算法,即代数重建法、联合迭代重建法、联合代数重建法和期望最大化算法,对这四种算法进行仿真比较。结果表明期望最大化算法比其他算法重建精度高、速度快,在实际爆炸中可以利用此算法指导野外施工,节约试验经费。

In this paper, the sensors were laid around explosion center to obtain shockwave travel time, then traveltime tomography methods were used to reconstruct overpressure field of underwater explosion induced shock wave. Due to insufficient sensors, the reconstruction is rather difficult. This problem of incomplete data needs more stronger algorithm to execute. The paper lists four common algorithms to solve the problems, they are ART algorithm, SIRT algorithm, SART algorithm and EM algorithm. Though the results of the appraisals, the EM algorithm with higher accuracy and velocity is feasible in actual test, and can help to save the costs.