Design Of Low Frequency Spectrum Analyzer Based On Zynq-7000 SoC

The spectrum analyzer plays an important role in the detection of the working state of the equipment and troubleshooting,and its applications have been used in industrial manufacturing,engineering equipment,national defense construction and other fields.The vast majority of spectrum analyzers on the market are complicated,costly,and have a measurable frequency range above 100 kHz,but there are few spectrum analyzers for frequencies below 10kHz;and low-frequency spectrum analyzers require on-site measurements to troubleshoot vibration It should be convenient and high-performance.The Zynq-7000 SoC chip integrates FPGA and ARM,making it easy to implement the entire function from the hardware and software.Therefore,in response to the needs of mechanical vibration signal analysis and fault diagnosis,a low-frequency spectrum analyzer based on Zynq-7000 SoC was studied,with a measurable range of 5Hz-5kHz.The design of the entire low-frequency spectrum analyzer uses the AD7606 of ADI as the acquisition front end of the low-frequency signal,and uses the SDK as the software platform to design the system driver software.The paper first introduces the research significance of low-frequency spectrum analyzer and the current situation at home and abroad,introduces the heterogeneous characteristics of Zynq-7000 SoC chip,analyzes the factors that affect the accuracy in spectrum processing,and proposes the hardware and software based on Zynq-7000 SoC Collaborative design schemes and methods to improve accuracy.The principle of FFT(Fast Fourier Transformation)algorithm is explained in detail in terms of spectrum analysis method.Piezoelectric acceleration sensor and AD conversion chip are selected according to the signal to be measured,and the signal conditioning circuit is designed;The AXI4 bus protocol proposes a core IP core AXI DMA IP and interconnected IP for hardware and software co-design.The spectrum leakage problem to be solved in spectrum processing proposes an overlapping frame technique,and uses the FFT IP core to complete spectrum measurement.And elaborated the software design method and the concrete realization way of Ethernet transmission in detail.The results show that within the frequency measurement range of 5Hz-5kHz,the frequency rate resolution reaches the order of nanohertz.The Zynq FFT IP test results are basically consistent with Matlab simulation,which is convenient for extracting signal characteristics.It also shows that software and hardware co-design can make full use of the parallel processing characteristics of FPGA and the flexibility of ARM implementation,and provide an optimized design idea for practical applications.