基于DSP的頻譜分析系統(tǒng)的設(shè)計(jì)
[Abstract]:With the rapid development of electronic technology, signal processing has been deep into many engineering fields, and the characteristics of signal frequency domain are becoming more and more important. The spectrum analysis system plays a very important role in the fields of signal communication, radar countermeasure, audio analysis and mechanical diagnosis. The traditional spectrum analyzer is built by the analog circuit to realize the spectrum analysis, so that the error of the instrument is inconvenient to control, the operation is complex, and the repair is not easy to be detected once the problem has occurred, which makes it impossible to meet the user's needs well. With the development of digital technology and the development of high-performance processors, the spectrum analysis system based on DSP has already occupied most of the market of the spectrum analyzer. First, in combination with the characteristics of most spectrum analyzer in the present market, the index of the system is specified, and the analysis target of the system is mainly the low-frequency mechanical vibration letter. The paper selects TMS320F2812 as the core chip, and combines the characteristics of the TMS320F2812 to complete the design of the overall system structure, and divides the system into several modes according to the function Block. Secondly, the two parts of the system control function and the signal processing function are respectively realized. The system control part is mainly to complete the automatic calibration function and the acquisition function of the ADC, allocate the specified storage space for the data, and complete the serial communication protocol writing, so that the system can be combined with the upper computer and the signal processing part mainly completes the preparation of the FFT fast Fourier algorithm, Line optimization. RFT algorithm is proposed for real signal, and the FFT efficiency is obtained. and the design of the frequency spectrum refinement Zoom FFT is completed, so that the system is improved, and finally, sending out an actual waveform testing system by a signal generator, The results show that the data error of the ADC in the system is satisfied with the real-time and the accuracy of the spectrum analysis.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TN911.7;TP368.1
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