【摘要】 为检测海洋环境中弱信号及提高目标信号的信噪比,利用样点抽样进行数字平均的弱信号检测系统设计,避免传统数字平均需要外部同步信号的局限性。系统采用软硬件相结合的设计手段,硬件部分由信号提取、信号调理、虚拟仪器及计算机等组成。软件部分以LabVIEW为软件开发平台,主要设计了数据采集、样点平均,保存,打印,查询等功能模块,最后对设计系统进行运行调试。该系统充分利用虚拟仪器在数字信号处理、波形数据存储、图形化程序设计等方面的优势,可推广应用于海洋监测行业及其他领域。更多还原

【Abstract】 In order to detect the weak signal and enhance the object signal SNR(Signal to Noise Ratio) for marine environment,this paper introduced the weak signal detection system,it avoided the shortage of tradition digital averaging theory which needed support of an external trigger source.The system’s design method was a combination of hardware and software.Therein to the hardware was composed of signal pick-up,signal condition,data acquisition,virtual instrument and PC.In software section,programming was based on LabVIEW.It realized data acquisition,sampling average,data to save,data to query,data to print etc.The system takes full advantage of the virtual instrument at point of digital signal processing,waveform data saving,figure program designing etc.it can be spread to apply for ocean detection trade and other domain.更多还原