Research On Distributed Multi-channel Data Acquisition And Recovery System For Rockets

Nowadays,the design and development of launch vehicles in the national defense field is being further strengthened,and the requirements for its launch success rate and reliability are also getting higher and higher.The state data of rocket structure changes during rocket flight is an important basis for evaluating its rocket structure performance.Aiming at the problems of data acquisition,high-speed transmission and large data storage of the structural state monitoring sensor data of the first,second and third stages of the rocket during flight,this paper designs a multi-channel recovery measurement system used on the rocket.In terms of system hardware design,the modular design is adopted,the STM32H753 chip of ARM Cortex-M series is selected as the main controller,and the 16-bit high-speed ADC acquisition chip AD7606 is used in the acquisition unit module to ensure the efficiency and accuracy of the system.The control chip ADG1206 improves the stable transmission performance of the system and ensures the effective transmission of 128-channel sensor data;the use of NAND Flash chips in the storage unit module ensures the storage reliability of the system.In terms of system software design,the acquisition unit module uses the main controller to drive the AD7606 to collect data,and adopts the DMA transmission scheme to improve the system transmission speed;the storage unit module is based on the embedded real-time operating system RTX5 environment,and uses eMMC to collect data.The data is stored,and the file system is used to simulate the implementation of USB firmware,and the stored data is obtained and analyzed in the Qt software interface of the host computer.The remote communication module of the system adopts the Beidou short message method.The main controller sends the GPS data to the ground receiver through the Beidou short message,and the rocket flight position information can be obtained in real time in the host computer,thereby realizing long-distance communication.In terms of system testing,the temperature test and vibration test are carried out to verify the stability of the system in different environments by simulating the environmental state of the rocket flight.Then,the analog voltage signal is input to the system to simulate the sensor data of the rocket flight,and the collection is carried out.And storage experiments,calculation and analysis of the acquisition accuracy,stability and storage performance of the system,to verify the reliability and correctness of the system;Finally,a short message communication experiment is carried out to ensure that the host computer can monitor the rocket flight position in real time.