一种基于电磁感应原理的角位移参数测量方法

针对目前常规弹药弹体研究领域角位移参数大动态和高精度的测量需求,提出了一种基于电磁感应原理的角位移参数测量方法,并设计了相应的角位移传感器.采用感应线圈获取弹体大转速动态范围内切割地磁场的信息,通过边沿检测和脉冲计数相结合的自适应闭环频率跟踪测量算法测量弹体旋转过程中的实时角位移参数信息,并采用周期清零的方式,消除累积误差.半实物和实物仿真试验结果表明:该角位移传感器不仅能够测量大动态范围内的角位移,拓宽测量范围从600°/s~36000°/s,而且完全消除了测量过程中的累积误差.测量误差小于0.220%,累加误差最大只有0.2°/s,实现了对弹药弹体角位移参数的实时、高精度测量,在姿态测量和地磁导航等应用领域具有一定的工程应用价值.

A measurement method for angular displacement parameter based on the electromagnetic induction principle

Aiming at the measurement requirements with an extremely high dynamic range and high precision for angular displacement parameter in the research field of conventional ammunition and projectile at present,this paper brings up a method for measuring angular displacement parameter based on the electromagnetic induction principle,and designs a corresponding angular displacement sensor as well.Induction coil is employed to acquire the information of projectile moving across geomagnetic field within a large dynamic range of rotational speed.Self-adaptive closed-loop frequency tracking measurement algorithm,which combines edge detection with pulse counting,is presented to measure the real-time information of angular displacement parameter in the process of the rotation of projectile.Accumulative error is eliminated by using the way of periodically pulse clear.The experimental results of semi-physical simulation and physical simulation demonstrate that the designed sensor not only can measure angular displacement within an extremely high dynamic range,broaden measurement range from 600 °/s to 36 000 °/s,but also can completely eliminate accumulative error during the measurement.The measurement error is less than 0.220% with the maximum accumulative error of lower than 0.2 °/s.Thereby realizing real-time measurement with high precision for angular displacement parameter of ammunition and projectile.The proposed method has definite value to engineering application in the fields of attitude determination and geomagnetic navigation,etc.