本文關(guān)鍵詞：動態(tài)信號分析儀的硬件設(shè)計　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 動態(tài)信號分析 信號源 高精度采集 FPGA 高精度數(shù)模轉(zhuǎn)換

【摘要】：動態(tài)信號分析儀一直是噪聲和振動分析、模態(tài)分析以及聲學測試的主要測試儀器,廣泛應(yīng)用于航空航天、機械、環(huán)境和生物醫(yī)療等領(lǐng)域。動態(tài)信號分析儀把信號產(chǎn)生、信號采集、信號分析和處理等多種功能很好的融合在一起,能在時域、頻域、幅值域上分析被測電信號所代表的物理量特征。論文首先介紹了動態(tài)信號分析儀的研究背景意義和國內(nèi)外同類產(chǎn)品的發(fā)展狀況,旨在設(shè)計一個具備高性能、大動態(tài)范圍的實時動態(tài)信號分析儀,然后針對具體的性能指標進行了系統(tǒng)的需求分析,并根據(jù)需求分析提出了整機的硬件設(shè)計方案,論文接下來對系統(tǒng)各功能模塊的硬件設(shè)計進行了詳細的論述。整個系統(tǒng)包括動態(tài)信號輸入調(diào)理模塊、高精度采樣及數(shù)據(jù)處理模塊和激勵信號源模塊三部分。動態(tài)信號輸入調(diào)理模塊主要完成對輸入動態(tài)信號的預(yù)處理,為了在分析帶寬內(nèi)獲得最佳的動態(tài)范圍,在高精度模數(shù)轉(zhuǎn)換之前需要對輸入信號進行相關(guān)的處理;在高精度采樣及數(shù)據(jù)處理模塊中運用過采樣原理,提出采用兩片∑-ΔADC實現(xiàn)對動態(tài)信號的高精度采集,同時基于軟線無線電理論,設(shè)計了一個高效的動態(tài)信號數(shù)據(jù)處理模塊,實現(xiàn)了數(shù)據(jù)緩存、數(shù)字下變頻和數(shù)字濾波等處理;在激勵信號源電路中應(yīng)用直接數(shù)字頻率合成技術(shù),設(shè)計實現(xiàn)了一個能產(chǎn)生多種常用波形信號的信號發(fā)生電路。論文通過對系統(tǒng)硬件電路的調(diào)試和整機指標的測試,基本實現(xiàn)了儀器高達625kSa/s的采樣率,102.4kHz的頻率范圍以及100dB動態(tài)范圍的指標要求,驗證了各個模塊方案的可行性及有效性。
[Abstract]:Dynamic signal analyzer is the main testing instrument for noise and vibration analysis, modal analysis and acoustic testing. It is widely used in aerospace and machinery. Environment and biomedical fields. Dynamic signal analyser combines signal generation, signal acquisition, signal analysis and processing, and so on. It can be used in time domain and frequency domain. The paper first introduces the research background significance of dynamic signal analyzer and the development of similar products at home and abroad in order to design a high performance. Large dynamic range of real-time dynamic signal analyzer, and then according to the specific performance indicators of the system needs analysis, and according to the demand analysis of the whole machine hardware design. The hardware design of each function module of the system is discussed in detail. The whole system includes the dynamic signal input conditioning module. High precision sampling and data processing module and excitation signal source module three parts. Dynamic signal input conditioning module mainly completes the input dynamic signal preprocessing in order to obtain the best dynamic range in the analysis bandwidth. The input signal needs to be processed before high precision A / D conversion. In the module of high precision sampling and data processing, the principle of oversampling is applied, and two pieces of 鈭，

本文編號：1408296