Research On The Positionable Wireless Missile-borne Storage Test System Based On Aperture Coupling

During the research and development of cannonballs,missiles,etc,a large number of tests are required to verify that related properties meet the design criteria.Although the storage test technology applying to projectile has matured at present,it’s difficult to search landing points after testing.Recycling and reading the collected data is inefficient.As to this problem,integrating positioning technology and wireless communication technology into traditional storage test technology is the most common solution right now.The problem that wireless signal is shielded by the metal projectile is solved by using ejection method.However,the following deficiencies still exist.The ejection device that has nothing to do with the projectile test is required.And the ejection causes that the ballistic test is incomplete.According to the actual project needs,a scheme is proposed about storage test system on projectile which can achieve the function of locating and communicating wirelessly based on coupling through the slit.It provides a new way of solving the above problems.The electrostatic shielding effect of the equipotential body is analyzed.The coupling characteristics of electromagnetic waves in the closed metal cavity with slit has been studied based on the principle of Babe.The metal cylindrical projectile model and slit model are built with CST.Finite element simulation is carried out on the basis of control variable method.The effect of the length,width and depth of the slit,gap filling medium,antenna installation location,etc on the coupling through the slit is determined within the GPS and 4G signal frequency band.Then the mechanical structure of the slit in the projectile used in experiments and storage test device are designed based on Solidworks.The performance of MAX-MSQ is enhanced from the hardware and software that is a multi-mode positioning module.The hardware optimization mainly lies in anti-static protection and anti-interference research on antenna access.Software mainly lies in the use of closed-loop control method to optimize the startup performance of positioning module and the use of idle interrupt method to optimize reception performance of NMEA-0183 protocol data frame.Based on 4G digital transmission module,data is transmitted through cloud server.The communication distance and reliability of the current storage test system are greatly improved.In addition,the storage efficiency is optimized by using a ping-pong buffer.The low power consumption design and anti-overload study of the system are carried out.The PC soft-ware is developed based on QT.A map tool with rectifying function is developed based on JS.Through the experiment of each module and the experiment of the whole storage test device applying to projectile,the performance and index of the storage test device designed in this project are evaluated.The experimental results show that the static positioning error is less than 3 meters when the device is not buried in sandy soil and the static positioning error is less than 20 meters when the device is buried in sand.The anti-overload performance meets 10000g.And it can realize remote wireless data recovery.