發(fā)布時間：2018-05-19 00:25

  本文選題：動態(tài)信號分析儀 + 可變帶寬處理��； 參考：《電子科技大學》2015年碩士論文

【摘要】：動態(tài)信號分析儀是一種具有內置信號源的通用FFT分析儀,具有大動態(tài)范圍、高采樣精度以及分析帶寬可靈活設置的優(yōu)點。傳統(tǒng)的動態(tài)測試分析裝置往往是一套由傳感器、模擬信號調理電路、采集分析儀、激勵信號源等一系列復雜設備組成的測試系統(tǒng),測試操作過程非常繁雜。隨著微電子技術的迅猛發(fā)展,誕生了集動態(tài)信號采集、存儲、分析為一體的動態(tài)信號分析儀,其可方便的用于現場的動態(tài)信號采集存儲及實時數據分析,已成為主要的動態(tài)信號測試技術發(fā)展趨勢。論文在基于FPGA+DSP的硬件架構平臺上完成了一種便攜式動態(tài)信號分析儀的數據處理以及內置信號源的設計,主要內容有:針對動態(tài)信號分析的數據處理需求,論文分析了動態(tài)信號分析儀在不同工作模式下的數據采集方式及分析方法,并根據不同儀器工作模式設計了相應測試數據預處理邏輯。主要包括了觸發(fā)模塊、數字下變頻模塊及多采樣率變換的抽取濾波模塊,基于以上模塊,實現了動態(tài)信號分析儀諸如頻譜分析、倍頻程分析、階比分析、直方圖分析及相關分析等多儀器模式的數據預處理工作。其中基于抽取濾波的可變帶寬分析為動態(tài)信號分析儀的一項重要功能,其通過改變信號的分析帶寬獲得了不同的頻率分辨率,從而增大了頻域分析的精確度。在內置信號源設計方面,論文首先基于DDS原理及結構完成了動態(tài)信號分析儀內置信號源的電路及邏輯設計,實現了正弦、線性調頻、隨機噪聲、突發(fā)信號和掃頻等信號的波形發(fā)生,其次從分析內置信號源的使用需求入手,研究了激勵信號與測試系統(tǒng)在各種測試模式及其不同配置間復雜的內在聯系,設計并實現了信號源參數與不同儀器模式參數間的聯動控制邏輯。論文通過該硬件平臺,測試并分析了不同儀器模式的數據處理邏輯及內置信號源的性能指標,測試結果表明論文的設計滿足動態(tài)信號分析儀的需求。
[Abstract]:Dynamic signal analyzer is a kind of general FFT analyzer with built-in signal source. It has the advantages of large dynamic range, high sampling precision and flexible analysis bandwidth. The traditional dynamic test and analysis device is usually a test system composed of a series of complex equipments such as sensor analog signal conditioning circuit acquisition and analyzer excitation signal source and so on. The test operation process is very complicated. With the rapid development of microelectronic technology, a dynamic signal analyzer, which integrates dynamic signal acquisition, storage and analysis, was born. It can be conveniently used in the field of dynamic signal acquisition, storage and real-time data analysis. Has become the main dynamic signal testing technology development trend. In this paper, the data processing of a portable dynamic signal analyzer and the design of built-in signal source are completed on the hardware architecture platform based on FPGA DSP. The main contents are as follows: according to the demand of data processing for dynamic signal analysis, This paper analyzes the data acquisition methods and analysis methods of dynamic signal analyzer in different working modes, and designs the corresponding test data preprocessing logic according to different working modes of instruments. It mainly includes trigger module, digital down-conversion module and decimation filter module of multi-sampling rate transformation. Based on the above modules, dynamic signal analyzer such as spectrum analysis, frequency-doubling analysis, order analysis are realized. Data preprocessing of multi-instrument mode such as histogram analysis and correlation analysis. The variable bandwidth analysis based on decimation filter is an important function of the dynamic signal analyzer, which obtains different frequency resolution by changing the analysis bandwidth of the signal, thus increasing the accuracy of the frequency domain analysis. In the design of the built-in signal source, the circuit and logic design of the built-in signal source of the dynamic signal analyzer is completed based on the principle and structure of DDS, and the sinusoidal, linear frequency modulation and random noise are realized. The waveform of burst signal and sweep signal is generated. Secondly, the complex relationship between the excitation signal and the test system in various test modes and different configurations is studied from the analysis of the use requirements of the built-in signal source. The linkage control logic between signal source parameters and different instrument mode parameters is designed and implemented. Through this hardware platform, the data processing logic of different instrument modes and the performance index of the built-in signal source are tested and analyzed. The test results show that the design of the paper meets the requirements of the dynamic signal analyzer.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM935
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本文編號：1907891