Frequency estimation method for free induction decay signal of proton magnetometer based on IpDFT
A technology of inductive attenuation and frequency estimation, applied in frequency measurement devices, instruments, scientific instruments, etc., can solve the problems of inability to estimate the signal frequency in a short time, limited frequency measurement time, fast attenuation of FID signals, etc. Complexity, small amount of calculation, and the effect of improving accuracy
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[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0030] The invention provides a method for estimating the frequency of the free induction attenuation signal of a proton magnetometer based on IpDFT. The method takes both positive and negative sequences in the signal spectrum into account for calculation, improves the estimation accuracy of the algorithm, and can perform calculations in a very short time. The estimated signal frequency still has high estimation accuracy in the environment of low signal-to-noise ratio.
[0031] As an embodiment of the present invention, the present invention provides the frequency estimation method of the proton magnetometer free induction attenuation signal based on IpDFT, and specific implementation is as follows;
[0032] The discrete-time expression of the FID signal generated by the proton magnetometer is
[0033]
[0034]It can be seen from the above f...
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