A Fast Field Program (FFP) is developed to calculate the underwater acoustic field excited by airborne source; in order to handle the elastic bottom environment, an improvement of simulation method is given. Sections I through 3 of the full paper explain and evaluate the improvement mentioned in the title, which we believe is helpful to designers in China and whose core consists of; (1) this method can be used to calculate air to water acoustic field in the near or not so far field, because it can provide not only continuous mode, but also discontinuous mode; (2) using the acoustic field programming, we analyze the characteristics of air to water sound transmission presented in Figs. 8 through 10 and give the important results which can help designers to study the method of detection from water to air.%建立空气声源跨越空-水界面辐射声场的快速场仿真计算模型,并提出改进的可以处理海底为弹性介质时的声传播计算方法.通过用理论值和用传播矩阵法计算的水平波束与幅度、相位关系图以及传播曲线的比较,验证了仿真计算算法的正确性.仿真计算结果表明:该方法在计算空气声源的辐射声场时,既包含了离散模式部分,又包含了连续模式,对中短距离的声场进行计算的结果较准确,优于简正波方法.通过该仿真算法可对空气声源的在空气及水下的辐射声场进行分析,对进一步研究水下对空中目标的探测技术具有重要意义.
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