脉冲激光探测方位角磁电检测技术

针对常规弹药脉冲激光周向探测系统无法精确获取目标方位信息的问题,设计了基于磁电检测的单光束激光引信全向方位角探测方案.对磁电检测系统进行建模,建立圆柱形永磁体转动磁场模型,推导出磁阻传感器所测位置磁场的解析式,验证所测磁场为一正弦磁场信号.依据此正弦信号,设计了上升沿阈值周期检测算法,并运用FPGA与TDC-GP21对激光回波出现时间与电机转速信号周期进行高准确度时间间隔测量实现方位角的解算.依据方案设计原理样机并编写上位机程序,进行方位角探测实验.实验结果表明:磁电检测系统采用多重屏蔽方法,能有效抑制电磁干扰;并能实时监测电机转速,实现方位角解算,方位角解算误差在±2°以内.满足激光引信方位角测量的高准确度、抗干扰能力强等要求.

Pulsed Laser Detection Azimuth Magneto-electric Detection Technology

Pulse laser fuze of conventional ammunition cannot accurately obtain the azimuth information of target.Therefore, the circumferential azimuth detection scheme of single beam laser fuze was designed based on magnetic-electric detection.The magnetic-electric detection system was modeled;a cylindrical permanent magnet rotating magnetic field model was established.The analytic expression of magnetic position which is measured by magneto resistive sensor was deduced.According to the analytical expression of the magnetic signal, rising along the cycle threshold detection method was put forward.The high precision azimuth resolution was achieved by using the method of combining FPGA with TDC-GP21 to measure high precision time, which is the time of laser echo signal appearance and the period of motor speed signal.According to the scheme, prototype was designed, and the program of the host computer was finished.The experiment of azimuth angle detection was carried out.The experimental results show that, the magnetic-electric detection system uses multiple shield method which can effectively suppress electromagnetic interference.Meanwhile, this system can achieve real time monitoring of the motor speed and range angle solver.Azimuth solution calculation error is in plus or minus 2°.The magnetic-electric detection system can meet the requirement of high precision and anti-interference ability of the azimuth angle measurement of laser fuze.