数字正交基模磁通门传感器电路

Circuit of digital orthogonal fundamental mode fluxgate sensor

正交基模磁通门相比传统平行激磁二次谐波磁通门具有宽频带、低噪声、小体积的优势。为满足地磁导航、电磁跟踪等领域的应用要求,进一步增大响应带宽,建立了数字正交基模磁通门传感器仿真模型,搭建了由高速ADC、FPGA、高精度DAC组成的硬件电路,采用了磁通门信号数字处理的方案,开发了相关FPGA程序,验证了数字解调方案的正确性和可行性。经测试,数字正交基模磁通门传感器带宽达到15 kHz,具有明显优势,同时在正交补偿、增益校准等智能化方面展现了良好的前景。

The orthogonal fundamental mode fluxgate has the advantages of wide frequency band,low noise and small volume compared with the traditional parallel excitation second harmonic fluxgate.In order to meet the application requirements in geomagnetic navigation,electromagnetic tracking and other fields,and further increase the response bandwidth,a digital quadrature fundamental mode fluxgate sensor simulation model was established,and a hardware circuit composed of high-speed ADC,FPGA and high-precision DAC was built.The related FPGA program was developed,the correctness and feasibility of the digital demodulation scheme were verified.After testing,the digital quadrature fundamental mode fluxgate sensor has a bandwidth of 15 kHz,which has obvious advantages,and shows a good prospect in the intelligentization of orthogonal compensation and gain calibration.