摘要目的 根据多交变磁场源电磁定位理论,设计用于电子胶囊磁感定位的数字信号处理电路,以减小电子胶囊的体积与功耗.方法 基于STM32单片机,使用快速数字滤波、峰值检测、频率检测等软件算法替代模拟滤波、峰值检测、比较电路等模拟硬件电路.结果 实验结果表明,数字信号处理系统的峰值检测和频率检测平均相对误差分别为1.51％和0.28％,可编程放大器的理论放大倍数与实际放大倍数线性关系基本一致,其平均比例差值为4.51 dB.结论 设计的数字信号处理系统可以替代部分模拟硬件电路,为减少电子胶囊的体积和功耗提供了基础.

abstractsObjective To develop a digital signal processing method for magnetic positioning of electronic capsules according to the theory of multiple alternating magnetic field source electromagnetic positioning, so as to reduce the volume and power consumption of electronic capsules. Method Based on STM32 MCU, software algorithms such as fast digital filtering, peak detection and frequency detection were designed to replace the corresponding analog hardware circuits such as analog filtering, peak detection and comparison circuits. Results The experimental results showed that the average relative error of the peak detection and frequency detection of the digital signal processing system were 1.51％ and 0.28％ , respectively. The linear relationships of theoretical amplification factor and actual amplification factor of the programmable amplifier were basically consistent, and the average ratio difference was 4.51 dB. Conclusions The proposed digital signal processing system can replace some analog hardware circuits, providing a basis for reducing the size and power consumption of electronic capsules.