E.V. Karshakov, A.K. Volkovitsky
FSBSI “V.A. Trapeznikov Institute of Control Sciences of Russian Academy of Sciences”, Moscow, Russia;
karshakov@ipu.ru
Al’manac of Modern Metrology № 1 (41) 2025, pages 119–129
Abstract. Most known quantum magnetometers have a periodic signal at the output. By measuring its frequency, it is possible to estimate the value of the magnetic field induction. In many applications, such as aeromagnetic measurements, one needs to increase the sampling rate, but this also increases the measurement error. This work describes two algorithms for obtaining frequency measurements. One averages the periods over one sample, the other averages the frequency over the same time gate. It is shown that the frequency estimate can perform better than the period estimate. Depending on the characteristics of the equipment the application limits for the described algorithms are presented. The paper also describes how to use a satellite navigation system solution for a time reference to ensure frequency estimation accuracy.
Keywords: frequency measurement, Larmor precession, optically pumped magnetometer, proton-precession magnetometer.
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