Artillery Muzzle Velocity Measurement Technology Based On CPCI Bus

Today,intelligent information technologies are widely used in various aspects of society,especially in the military field,and sophisticated requirements are placed on intelligent information technologies.In order to achieve effective combat of artillery shells,the artillery has established an intelligent control system,and the speed of the projectile is the most important one of the feedback information of the control [1].Although many artillery are standard artillery and the muzzle velocity remains stable,muzzle velocity of the artillery can be affected by changes in the thermal expansion and contraction of the gun barrel due to ambient temperature and barrel temperature,frictional changes due to humidity,and gunpowder residue.The effects of various factors such as changes in the coefficient of friction of the pipe fluctuate.The fluctuations caused by these factors cannot be ruled out.In order to make the artillery adjustment less affected by these factors and meet the needs of modern warfare,the real-time acquisition of muzzle velocity data of the artillery is particularly important.In the measurement,taking into account the large amount of data measured in the original speed,if the direct transmission without processing will lead to a long transmission time,the system can best expand other issues such as a variety of data transmission,this article conducted a series of theoretical analysis And system design.The system uses Doppler radar to measure the muzzle velocity of a standard gun.Through Doppler signal amplification,filtering,downconversion,low-pass filtering,and AD acquisition,real-time fast Fourier transform and center frequency detection methods are used to obtain the Doppler data.Le shift frequency,using Doppler effect velocity and frequency shift relationship to determine the artillery projectile at the muzzle velocity.The system measures three sets of data during each launch,and the three sets of data undergo error correction to obtain the final speed data.The speed data is transmitted to the CAN interface function card via the CAN bus.The data is filtered by the interface function card and sent to the main control computer via the CPCI control unit and sent to the CPCI bus.In addition to the design of the Doppler signal data acquisition card,the system has also designed an interface function card to receive data transmitted from multiple CAN nodes to achieve system data diversity.The system also uses Windriver to write and install user-level CPCI device drivers,and writes a multi-task data processing test program based on the pipeline communication mechanism to verify system functions.In addition,combined with the problems in engineering practice,the interrupt handling function was optimized and improved.The test results show that the accuracy of the system speed measurement meets the actual requirements,the overall data processing and transmission time is less than the preset time,there is enough time to feedback to the control unit to make the appropriate adjustments,realtime performance is higher.And the system has high scalability and can connect multiple information acquisition devices,which can withstand high-speed data transmission and processing.