Research On Surface Impact Localization Technology For Intelligent Armor

Since World War I,armored units have always played an important role on the battlefield.With the development trend of intelligence and informatization in modern warfare,armored units have further improved their demand for intelligence and battlefield survivability.Armored units have limited means of observing the outside of themselves,especially armored units with heavy firepower such as tanks and self-propelled artillery.Compared with light firepower units,armored units with heavy firepower have poor battlefield mobility.They don’t have enough self-checking methods and own health information when they go deep into the infantry group or fall into an encounter,often rely on manual extravehicular operations to judge the health of the outer armor,which is dangerous;and its internal space is too small to place large-scale measuring equipment.At present,there is no miniaturized,low-cost,and built-in armor surface impact positioning technology,which can enable the personnel in the cabin to judge the state of the outer armor to a certain extent without exposing soft targets.Starting from the design idea of armor embedded,combined with the actual battlefield needs,this paper proposes a surface impact positioning technology for intelligent armor.Use a special embedded structure to arrange the strain gauges inside the armor plate,design the strain array arrangement based on the HDOPvalue,rely on the high-performance STM32H743 MCU to design a highly integrated small system,through channel time difference compensation,signal delay The estimation and positioning algorithm completes the battlefield mission of locating the impact on the armor surface,and improves the intelligence level and battlefield survivability of armored units.This paper analyzes the domestic and foreign research status of strain sensing and surface positioning technology requirements,expounds the advantages and disadvantages of different schemes,and determines the sensing scheme of strain array.Combined with the requirements of signal synchronization accuracy,economy and miniaturization,the design The overall scheme of the positioning technology,explaining the key problems to be solved and the solutions.From the perspective of engineering demand and economy,the embedded structure is used to paste the strain gauges,the structural mechanics model is analyzed,and the arrangement of the array sensor is determined by comparing the HDOP value.Facing the requirements of miniaturization,high integration,multi-channel and high time synchronization,a small integrated strain signal acquisition circuit system is designed in this paper.Aiming at key issues such as strain sensing and multi-channel synchronous acquisition,a detailed solution is proposed,and the feasibility of the solution is verified through experiments.The system has the advantages of high integration,high computing power,miniaturization,and simple circuit,which provides a hardware foundation for surface impact positioning.In order to realize the sampling time difference compensation of single ADC and multiple channels,this paper proposes two methods of time difference calibration.According to the interpolation compensation requirements,this paper designs a linear interpolation compensation method and a cubic spline interpolation compensation method,and elaborates on the principles and implementation of the two algorithms process,choose to use the cubic spline interpolation compensation method after comparative analysis.It is verified by experiments that the time synchronization accuracy of channel 1 and channel 5 after compensation can reach97% for the 40 KHz sine wave signal five-channel sampling.According to the seismic source positioning requirements,the generalized cross-correlation time delay estimation algorithm and TDOA positioning algorithm were studied,and the time delay estimation accuracy was verified to be about 98%,and the armor surface positioning error was less than 1cm,which verified the engineering application ability of the positioning system and the positioning accuracy of algorithm.