Progress of the improved FHD proton magnetometer

The FHD vector proton magnetometers based on proton precession observation model have been introduced into the Geomagnetic Network of China (GNC) since the digital reconstruction of geomagnetic observatories. Up to now, these instruments have been practiced for many years and good observation results have been achieved. However, some new problems appeared during the observation. To solve these problems and achieve higher quality observation data for meeting the higher observation standards, the FHD vector proton magnetometer has been upgraded and improved. This paper mainly introduces the problems existing in the FHD vector proton magnetometer observation of GNC, discusses the corresponding solutions, and presents the experimental results of the improved FHD proton magnetometer.