自消除激光破片测速仪误触发的算法

针对现有采用内触发方式的 JGM －P400激光破片测速仪在战斗部野外静爆试验中存在误触发现象，在对静爆试验中破片过靶信号为正向脉冲信号进行理论分析和建模仿真基础上，提出了基于过靶信号脉冲宽度的自消除系统误内触发算法。通过设置合适的过靶信号脉冲宽度阈值 TS ，给出内触发有效与否的判决表达式，并做算法的 FPGA实现。测试结果表明：设置阈值 TS为100μs时，该算法能有效判别系统内触发是否有效，并自动消除误触发现象，保证了激光破片测速仪测得的数据正确、可靠。

An Algorithm Designed for Automatically Eliminating the False Trigger of Laser Fragments Velocimeter

In response to the existing false trigger phenomena of laser fragments velocimeter JGM-P400 through internal trigger mode and based on the theory and simulation analysis of the signal as the frag-ments flying across the laser screen in the warhead static explosive experiment,an algorithm is put for-ward which could automatically eliminate system false trigger based on signal pulse width. Through set-ting the appropriate threshold of the signal pulse width TS,a conclusion is reached whether the internal trigger is judged valid or not by offering an expressive formula and conducting the FPGA implementa-tion of the algorithm. Test results show that this algorithm can not only judge but also eliminate the sys-tem false trigger automatically when the TS is 100 μs,which guarantees the correctness and reliability of the data measured by the velocimeter.