The optically pumped cesium magnetometer is a quantum magnetometer based on the Zeeman effect. The frequency of the output Larmor signal is proportional to the magnetic field intensity. Therefore, improving the measurement accuracy of the Larmor frequency can make the magnetic field measurement more accurate. However, the Larmor signal is easily coupled with various randomly distributed noises, which will generate an unavoidable trigger error. To address the above problem, we propose a multi-gate and equal-precision fusion method. In this method, the trigger error is averaged into the count of each small gate through the multi-gate structure to improve the frequency measurement accuracy and the continuous sampling performance. We implemented this method on the FPGA and conducted indoor and outdoor experiments. The experimental results show that this method not only improves the measurement accuracy by three times of the traditional method, but also enhances the stability and noise suppression ability of the system, and can provide technical and instrumental support for magnetic field measurement projects.

光泵铯磁力计是一种基于塞曼效应的量子磁力计。输出拉莫尔信号的频率与磁场强度成正比。因此，提高拉莫尔频率的测量精度可以使磁场测量更加准确。然而，Larmor 信号容易与各种随机分布的噪声耦合，从而产生不可避免的触发误差。为了解决上述问题，我们提出了一种多门等精度融合方法。该方法通过多门结构将触发误差平均化到每个小门的计数中，以提高频率测量精度和连续采样性能。我们在 FPGA 上实现了这种方法并进行了室内和室外实验。