Rapid prediction of ambientnoise field in complicated stratified shallowwater that varies both with time and location is significant for a sonar system to match its environment.
海洋环境噪声场是一个随地域、时间变化的复杂的场，现场快速预报对于环境匹配的声纳系统有重要意义。
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Based on the theory of the local spectrum of ambient-sea noise field, theoretical models of the low-noise-channel for typical shallow-water negative gradient (or thermocline) are developed.