基于阶梯波参考信号的改进型正交锁定放大
发布时间：2019-08-08 17:50
【摘要】：对以阶梯波作为参考信号的正交锁定放大的探测精度进行了建模分析,基于硬件简单原则给出了以阶梯波作为参考信号的正交锁定放大信号检测方法的实现策略。综合考虑参考波形的失真度与采样率之间的关系,对比分析了基于面积等效法和特定谐波消去法的阶梯波合成方法。根据阶梯波参考信号对采集电路相位精度的要求及待检测信号的周期性,提出了匹配采样技术。实测结果表明:采用现场可编程门阵列(Field programmable gate array,FPGA)实现所提出的正交锁定放大,方法简单、硬件要求低、可用于识别不同异常体。改进后方法的误差为0.7%~7%,与以方波为参考信号的正交锁定放大相比,提高了探测精度。
[Abstract]:The detection accuracy of orthogonal locking amplification with ladder wave as reference signal is modeled and analyzed. Based on the principle of hardware simplicity, the implementation strategy of orthogonal locking amplification signal detection method with ladder wave as reference signal is given. Considering the relationship between distortion and sampling rate of reference waveform, the stepped wave synthesis method based on area equivalent method and specific harmonic elimination method is compared and analyzed. According to the requirement of the step wave reference signal for the phase accuracy of the acquisition circuit and the periodicity of the signal to be detected, a matching sampling technique is proposed. The measured results show that the proposed orthogonal locking amplification is realized by using field programmable gate array (Field programmable gate array,FPGA). The method is simple and the hardware requirements are low, and it can be used to identify different abnormal bodies. The error of the improved method is 0.7% 鈮，
本文编号：2524509
[Abstract]:The detection accuracy of orthogonal locking amplification with ladder wave as reference signal is modeled and analyzed. Based on the principle of hardware simplicity, the implementation strategy of orthogonal locking amplification signal detection method with ladder wave as reference signal is given. Considering the relationship between distortion and sampling rate of reference waveform, the stepped wave synthesis method based on area equivalent method and specific harmonic elimination method is compared and analyzed. According to the requirement of the step wave reference signal for the phase accuracy of the acquisition circuit and the periodicity of the signal to be detected, a matching sampling technique is proposed. The measured results show that the proposed orthogonal locking amplification is realized by using field programmable gate array (Field programmable gate array,FPGA). The method is simple and the hardware requirements are low, and it can be used to identify different abnormal bodies. The error of the improved method is 0.7% 鈮，
本文编号：2524509
本文链接：https://www.wllwen.com/kejilunwen/yiqiyibiao/2524509.html
