Modern Electronic Technique

In view of the excessive size and insufficient collection accuracy of the traditional data acquisition systems, this paper designs a multi⁃channel data acquisition system based on the FPGA+ARM architecture. The system is tailored to meet the precise measurement requirements for parameters such as pressure and temperature in the field of aerospace. It comprises a power supply module, a channel switching module, a data acquisition module, and a data transmission module. Among them, the data acquisition module utilizes the SOM⁃TLT3F as its core controller, and integrates a signal conditioning circuit, a 24⁃bit analog⁃to⁃digital conversion chip AD4630, and eight multiplexing chips ADG1607 to enable synchronous acquisition of data of 64 channels. The FPGA (field⁃programmable gate array) achieves SPI communication with the ARM by interrupt control, and the processed data is transmitted to the upper computer via the UDP protocol. Experiments demonstrate that the system combines the characteristics of high collection accuracy with miniaturization, enabling stable operation in harsh environments such as high temperature and high pressure. The multi⁃channel switching design ensures efficient acquisition of multiple data streams, with a sampling relative accuracy not more than 0.23%. Featuring miniaturization and high collection accuracy, the proposed system provides a viable solution for precision testing in the field of aerospace.