The Study of FID Signal Detection Technology of Proton Magnetometer Based on Prony Method

摘要

In order to improve the accuracy and stability of the frequency measurement of proton magnetometer free decay signal (FID signal), many methods had been taken. However, many of them may be much better if they had considered the signal detection in a dynamic measurement and strong noisy environment. So the Prony method is proposed in this paper. It focuses on discussing the basic principle and describing the matrix mathematical model of FID, theoretical study, then the FID signal of proton magnetometer is processed based on the Prony method. Finally, the measurement of frequency and numerical example are done shown the proposed method effective and feasible. The accuracy of measurement results can be achieved up to the one thousandths. Therefore, good results could be achieved by the study of the Prony method to measure the frequency of FID signal.