摘要
接收信号的频率偏差是影响六自由度电磁定位系统精度的主要原因之一,分析表明采用函数拟合法提取信号将会使频偏的影响放大将近两个数量级。针对这一问题提出基于全相位校正的信号提取方法,该方法采用双窗ap FFT时移相位差法抑制频偏,提高接收信号的幅值提取精度;利用信号的正交性、周期性,简化求解过程,便于方法硬件实现。将函数拟合法与所提方法进行MATLAB仿真实验比较,结果表明,所提方法在10 d B^50 d B的噪声环境下可有效降低幅值提取误差,将六自由度电磁定位系统的距离误差降低至0.03 cm以内、角度误差降低至0.2°以内。
The frequency deviation of received signal is one of the main reasons that affect the accuracy of 6-DOF （ six degree of freedom ） electromagnetic positioning system, The results of function fitting method show that the effect is amplified two orders in magnitude approximately. A novel signal extraction method based on all-phase correction is proposed to reduce effect from trequency deviation and improve positioning precision. Simplified algorithm by adopting the orthogonality and periodicity of emission signal, and convenient for hardware implementa- tion. The simulation results illustrate that the proposed method reduce amplitude deviation of received signal compared with function fitting method, under a noise environment with power 10 dB ~ 50 dB. And the simulation results demonstrate the system location error decrease to 0.03 cm, and orientation error decrease to 0.2°.
出处
《传感技术学报》
CAS
CSCD
北大核心
2017年第5期715-720,共6页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金委员会项目(61171137)
关键词
电磁定位
频偏
全相位校正
幅值提取
electromagnetic positioning
frequency deviation
all-phase correction
amplitude extraction
