基于交变信号源的磁定位技术研究

Research on magnetic positioning technology based on alternating signal source

针对磁偶极子定位系统中静态磁信号源产生的静态磁场容易受到背景磁场和环境噪声的干扰的问题,提出了以交变磁场作为磁信号源进行梯度张量定位,研究了其稳定性。以正弦交变磁场信号为发射源,并利用锁相放大器实现对交流信号的解调,通过单点定位算法完成定位。实验结果表明:当噪声的信噪比逐渐减小时,静态磁源的绝对定位误差明显增大,而交变磁源定位系统受环境噪声的影响较小,具有较强的稳定性。

Aiming at the problem that the static magnetic field generated by the static magnetic signal source in the magnetic dipole positioning system is easily disturbed by the background magnetic field and environmental noise,an alternating magnetic field is proposed as a magnetic signal source for gradient tensor positioning,and its stability is studied.A sinusoidal alternating magnetic field signal is used as the emission source,and a lock-in amplifier is used to demodulate the AC signal,and the positioning is completed by a single-point positioning algorithm.The experimental results show that when the signal-to-noise ratio of the noise gradually decreases,the absolute positioning error of the static magnetic source increases significantly,while the alternating magnetic source positioning system is less affected by environmental noise and has strong stability.