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中文摘要：
空投物体入水时产生具有时域冲击特性的信号,一般称之为瞬态信号。Hilbert-Huang变换可通过经验模态分解和Hilbert谱分析两种方法,从时频角度对瞬态信号进行分析。介绍了Hilbert-Huang变换的基本原理,建立了瞬态信号的数学模型,提出了基于Hilbert-Huang变换的信号重构瞬态信号检测方法,并与传统能量检测器的性能进行了对比分析,最后通过软件仿真和湖试数据处理验证了该方法的可行性和有效性。
英文摘要：
When an object airdropped into the water, some signals with impact characteristics in time domain will be generated, which are commonly known as transient signals. Hflbert-Huang Transform could analyze the transient sig- nals in time-frequency domain by empirical mode decomposition and Hilbert spectral analysis. The principle of Hil- bert-Huang Transform is introduced, and the mathematic model of transient signal is formed. A new method of tran- sient signal detection based on Hilbert-Huang Transform is proposed, whose performance is analyzed and compared with that of the traditional energy detector. Finally the feasibility and validity of the method are verified by the software simulation and the data processing of lake experiment.
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