Cesium optical pump horizontal gradiometer output frequency signal measuring circuit

The invention relates to a cesium optical pump horizontal gradiometer output frequency signal measuring circuit. The circuit comprises a signal conditioning module and a frequency measurement module, after original signals output by two cesium optical pump magnetometers are processed by the signal conditioning module, external frequency signals to be measured are input into an FPGA; and an external constant-temperature crystal oscillator square wave signal triggered by voltage is input into the FPGA as a frequency measurement reference signal. The rising edge of the standard signal is used as an enabling mark of counting of synchronous starting of the three signals, the three signals are counted synchronously within the specified frequency measurement gate time, and the number of the rising edge is recorded. An external constant-temperature crystal oscillator is used as a frequency measurement reference signal, so that the drift and irregular jitter of a pulse signal generated by the FPGA onboard crystal osci