Design And Implementation Of Virtual Spectrum Analyzer Based On Improved CORDIC Algorithm

With the rapid development of 5G and Internet of things,all kinds of wireless devices are widely used,and on-site debugging and maintenance is becoming more and more common.The traditional spectrum analyzer is limited by the volume,price and use conditions,which can not meet the current demand,and the handheld spectrum analyzer is limited by the volume,cost and other factors,which can not expand the function.In order to solve these problems,some researchers have designed portable spectrum analyzer for special needs,which to a certain extent solves the partial needs of om-site debugging and maintenance,but there are still some shortcomings,such as poor versatility and low cost performance.Therefore,this thesis designed and implemented a virtual spectrum analyzer based on the improved CORDIC algorithm.Firstly,on the basis of consulting a large number of relevant research literature,the research status and significance at home and abroad are summarized.The upper computer software and instrument hardware of the virtual spectrum analyzer are studied and implemented.The overall scheme of the virtual spectrum analyzer designed in this thesis is given.According to the analysis of the upper computer software requirements of the virtual spectrum analyzer,the upper computer software flow chart is given,The upper computer program of the virtual spectrum analyzer is designed in MATLAB,the interface screenshot of the upper computer and the hardware architecture diagram of the virtual spectrum analyzer is given,the hardware circuit of the virtual spectrum analyzer is designed and debugged,and the control logic of the hardware module and the test results of the module function are given.Then,in order to improve the computing speed in the case of limited resources,an improved CORDIC algorithm based on half search strategy is proposed.The algorithm flow chart and detailed steps are given.Compared with the comparison algorithm,the improved algorithm reduces the number of searches for the preset rotation angle meter when it achieves the same computing accuracy,the spectrum analysis module of CORDIC algorithm based on half search strategy is implemented on FPGA chip and applied to spectrum analysis in panoramic scanning mode.Secondly,according to the needs of spectrum analysis of multiple close spaced frequency points,a strategy of selecting window function adaptively according to the frequency point spacing is given to achieve the measurement balance of frequency accuracy and power accuracy.The bispectral interpolation method based on this strategy to correct the frequency accuracy and power accuracy of multiple frequency points is simulated and verified on MATLAB.Finally,the software and hardware of the virtual spectrum analyzer based on the improved CORDIC algorithm are tested,and the reasons for the error of the relevant indicators are analyzed.The virtual spectrum analyzer can be combined with efficient and flexible upper computer software to complete various test and measurement applications.The user controls the action of hardware module through the upper computer software.Because the display screen and operation panel of the spectrum analyzer are removed,not only the cost of the system is reduced,but also the volume is small and easy to carry,The function expansibility of the system becomes more powerful by using the form of virtual instrument,and users can expand according to their own needs.