Design Of Waveform Analysis Software Of Digital Storage Oscilloscope

The rapid development of modern electronic technology has made digital storage oscilloscopes as general-purpose electronic measuring instruments widely used in industrial production.In addition to key indicators such as sampling rate,storage depth,rise time,and real-time analog bandwidth,users also increasingly demand more of oscilloscope’s processing capabilities of signal waveforms.Integrating various testing instruments is and a wealth of waveform analysis tools has become the trend of modern digital oscilloscopes development.Spectrum analysis based on Fourier transform and digital filter design and operation are signal processing tools widely used in electronic engineering applications,but the former usually has many performance limitations in existing oscilloscopes such as slow speed and inflexible spectrum analysis range,while the latter rarely appears in the analysis tools of general oscilloscopes.Therefore,based on the waveform math operation function of the digital oscilloscope platform,this article deeply researches the related techniques to improve the efficiency of spectrum analysis and the design and implementation detail of digital filter software function.The details are as follows:1.Research on spectrum analysis techniques.In order to solve the problem of inflexible spectrum analysis range of existing functions,the spectrum analysis and spectrum interpolation methods that can improve the spectrum resolution and show the spectrum details is researched,including the spectrum analysis based on digital down conversion,chirp-z transform and non-uniform Fourier transform.2.The software implementation of accelerated fast Fourier transform based on the SIMD instruction set.A major bottleneck of the performance of spectrum analysis is that the software implementation of the fast Fourier transform is not efficient,and therefore this thesis researches in detail the vectorization of the fast Fourier transform computation based on modern processors SIMD instruction set.The simple implementation of simple Fast Fourier transform algorithms including Cooley-Tukey and split-radix algorithm is introduced.And the vectorization of fast Fourier transform is studied based on the conjugate pair algorithm.The results show that the vectorized fast Fourier transform can greatly improve the calculation throughput,thereby improving the speed of spectrum analysis.3.Research on digital filter design algorithms and software design and implementation.The various design methods of FIR and IIR digital filters are introduced,including frequency sampling,least square error and Chebyshev optimal filter design and other FIR filter design methods and classic analog filter(Butterworth,Chebyshev,etc.)design and analog-digital domain transformation method.Secondly,the design of digital filter software is analyzed,and the preliminary implementation and verification is carried out on the oscilloscope software platform.