CPT原子磁力仪转向差及其标定补偿

Heading Error Calibration and Compensation of CPT Atomic Magnetometer

CPT原子磁力仪具有无方向盲区,并且在磁感应强度方向变化时可连续测量无需模式切换的特点,特别适合搭载在卫星、直升机等平台进行拖曳式探测。但是CPT原子磁力仪存在转向差问题,且探头剩磁干扰会影响转向差的补偿精度,进而影响其使用性能。本文针对CPT原子磁力仪转向差问题,分析了转向差机理,建立了探头剩磁补偿模型并进行了补偿,使用粒子群算法估计了剩磁参数,并使用剩磁补偿后的转向差离散点进行三次样条插值得到转向差曲线。试验结果表明:算法估计的探头剩磁在旋转面的投影分量大小为0.344 nT,方向与探头轴线垂直。在剩磁补偿前后,转向差补偿后的残差标准差由0.288 nT减小到0.132 nT,标准差减小了54%,有效提高了CPT原子磁力仪的使用性能。

The CPT atomic magnetometer exhibits characteristics such as dead-zone-free operation,and continuous measurement capability without the need for mode switching when the magnetic field direction changes.This makes it particularly suitable for applications on satellites,helicopters,and other platforms.However,the CPT atomic magnetometer is prone to heading errors,and sensor remanence can adversely affect the accuracy of heading error compensation.This paper analyzes the heading error mechanism of the CPT atomic magnetometer and establishes a sensor remanence compensation model.Particle Swarm Optimization(PSO)is employed to estimate the remanence parameters,and the heading error curve is derived using cubic spline interpolation.Experimental results demonstrate that the algorithm estimates the projected component of sensor remanence on the rotating surface to be 0.344 nT,perpendicular to the sensor axis.After compensating for remanence,the standard deviation of residual error following heading error compensation decreases from 0.288 nT to 0.132 nT,marking a 54%reduction.This method effectively enhances the application performance of the CPT atomic magnetometer.