Abstract
该文提出了利用被动声纳信号LOFAR谱图的二维傅里叶变换计算波导不变量的方法。在用简正波方法分析了两种典型波导的波导不变量分布情况的基础上，推导了利用LOFAR谱图二维傅里叶变换脊计算波导不变量的公式。运用该公式仿真计算了Pekeris波导和具有负跃层的浅海波导声场中声源深度从10m变化到90m时的波导不变量值，经过与南海试验数据的计算对比，两者计算结果相符。与简正波方法相比，该方法不需要精确了解海洋环境参数，同时避免了复杂的微分方程求解运算，更适合于信号的实时处理。
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