Design Of Signal Acquisition System Based On Ethernet Interface

With the continuous and rapid development of the electronic information industry,signal acquisition technology has become an important technology that can affect the development of this field.Signal acquisition systems require sensors,analog-to-digital converters,and other devices to acquire and convert signals.High-speed,high-precision,real-time data acquisition has a wide range of applications in areas such as driverless,medical equipment,unmanned factories,and defense industries.With the maturity of communication technologies and the continuous expansion of Internet applications,the need for long-distance,high-precision,and high-speed data acquisition has been continuously raised.Under the premise of meeting the accuracy and speed of the system requirements and other basic functions of data acquisition,rapid,long-distance transmission of data acquisition has become a new trend of development.The current data acquisition system is also developing in the direction of long distances,multiple endpoints,and high precision.The high-precision,high-speed data acquisition system studied and designed in this paper is based on the STM32F407 control chip and Ethernet interface.The entire system can be divided into two parts,namely the analog part based on the analog-to-digital converter and the digital part based on the STM32F407 control chip.The access of the analog part of the multi-channel signals is multiplexed,which enables the acquisition of multiple analog signals and A/D conversion on the basis of using less resources.The processing control core of the system adopts STM32F407 chip to realize the logic control and timing control of the analog part,and send and receive data according to the IEEE 802.3 standard through the Ethernet peripheral.In order to improve the reliability and stability of the system,a digital isolator is added for isolation when the analog part communicates with the digital part.Based on systematic analysis of key technologies such as multiplexing,analog-to-digital conversion,and Ethernet communications,the overall design of the signal acquisition system is designed,which determines the overall architecture of the system.In the framework of the system,the layout of the modules is completed combined with the characteristics of the modules,which solves the hardware device layout,module configuration,as well as hardware issues such as clocks and power supplies.The thesis is designed based on the basic requirements of the signal acquisition system and can accomplish high-precision,high-speed and multi-purpose signal acquisition.After completing the hardware design and software design of the system,multi-channel analog signals were collected and the converted digital signals were processed.Finally,the contents of this study are summarized,the deficiencies of the system are pointed out,and improvement schemes are proposed.