动态信号分析仪的数据处理与测试信号源设计

发布时间：2018-05-19 00:25

  本文选题：动态信号分析仪 + 可变带宽处理　； 参考：《电子科技大学》2015年硕士论文

【摘要】：动态信号分析仪是一种具有内置信号源的通用FFT分析仪,具有大动态范围、高采样精度以及分析带宽可灵活设置的优点。传统的动态测试分析装置往往是一套由传感器、模拟信号调理电路、采集分析仪、激励信号源等一系列复杂设备组成的测试系统,测试操作过程非常繁杂。随着微电子技术的迅猛发展,诞生了集动态信号采集、存储、分析为一体的动态信号分析仪,其可方便的用于现场的动态信号采集存储及实时数据分析,已成为主要的动态信号测试技术发展趋势。论文在基于FPGA+DSP的硬件架构平台上完成了一种便携式动态信号分析仪的数据处理以及内置信号源的设计,主要内容有:针对动态信号分析的数据处理需求,论文分析了动态信号分析仪在不同工作模式下的数据采集方式及分析方法,并根据不同仪器工作模式设计了相应测试数据预处理逻辑。主要包括了触发模块、数字下变频模块及多采样率变换的抽取滤波模块,基于以上模块,实现了动态信号分析仪诸如频谱分析、倍频程分析、阶比分析、直方图分析及相关分析等多仪器模式的数据预处理工作。其中基于抽取滤波的可变带宽分析为动态信号分析仪的一项重要功能,其通过改变信号的分析带宽获得了不同的频率分辨率,从而增大了频域分析的精确度。在内置信号源设计方面,论文首先基于DDS原理及结构完成了动态信号分析仪内置信号源的电路及逻辑设计,实现了正弦、线性调频、随机噪声、突发信号和扫频等信号的波形发生,其次从分析内置信号源的使用需求入手,研究了激励信号与测试系统在各种测试模式及其不同配置间复杂的内在联系,设计并实现了信号源参数与不同仪器模式参数间的联动控制逻辑。论文通过该硬件平台,测试并分析了不同仪器模式的数据处理逻辑及内置信号源的性能指标,测试结果表明论文的设计满足动态信号分析仪的需求。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM935
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本文编号：1907891