Distributed Multi-Protocol Wireless Data Acquisition Module Hardware Design

Data acquisition is the main means of obtaining information,but with the development of electronic information technology and the increase in test diversity,the current single acquisition system can no longer meet the needs of certain large-scale test scenarios.Moreover,traditional distributed data acquisition systems have problems with wired cable wiring of acquisition terminals,interoperability and control of multiple acquisition terminals,and adaptability of distributed test systems to different test scenarios.Therefore,distributed wireless data acquisition systems that use multiple wireless communication protocols for data interaction are gradually gaining importance.Based on the above problems,this thesis designs a distributed multi-protocol wireless data acquisition module.The module is equipped with data acquisition,multiprotocol wireless communication and wireless triggering functions by combining a single data acquisition board with a variety of wireless communication boards with different wireless communication methods.The main research elements of the thesis are:1.Design the general framework of the distributed multi-protocol wireless data acquisition module,divide the module into three parts: data acquisition,wireless communication and power supply,respectively for and elaborate the scheme design of each component.2.Design the hardware circuit and logic of the data acquisition board.The hardware is based on the architecture of Analog-Digital Convert(ADC)+ Field-Programmable Gate Array(FPGA)+ mass memory to achieve dual-channel analogue signal acquisition,storage and data transmission.In terms of digital logic,the dual-threshold digital edge trigger technology is used to implement the channel edge trigger function to avoid the impact of burr on the trigger function.The large-capacity data cache logic is also designed to realise the module’s deep storage function.3.Design the hardware circuit and logic of the wireless communication board.For the hardware,a Beidou timing module and an RF transceiver module are used to form separate timing trigger and random trigger channels.Based on the embedded module +wireless communication module(including Wi-Fi,Bluetooth,Zigbee,Lo Ra,Halow,LTE)architecture,to achieve data interaction with the upper layer facilities of the acquisition system.The digital logic is based on the second pulses output from the Bei Dou timing module and the workflow of the RF transceiver module to generate timing trigger signals and random trigger signals.4.Elaborate the test methods for functional indicators in distributed multi-protocol wireless data acquisition modules and complete the testing of indicators for distributed multi-protocol wireless data acquisition modules.Through the study of the above,the hardware system design of the distributed multiprotocol wireless data acquisition module was completed.Finally,through experimental verification,the multi-protocol wireless transmission function with a coverage area of50m×100m,real-time sampling rate of 250 MSPS,storage depth of 512 Mpts,timing trigger delay less than 2μs and random trigger delay less than 2ms were achieved,providing hardware support for the distributed multi-protocol wireless data acquisition system.