A New Model for Remote Calibration of Voltage Source Based on GPS Common-View Method

A remote calibration system of dc voltage source based on global positioning system (GPS) common-view method is proposed in this article. The system realizes remote calibration by installing the standard in the laboratory instead of the calibrated site and solves the problem of additional errors introduced by the standard at the calibrated site. By researching the relationship between voltage, frequency, and time, a new model for remote calibration of voltage source based on the GPS common-view method is built. The model reflects the mathematical relationship between calibration results and parameters measured by the calibration system. The accuracy of the model is a prerequisite to ensure the reasonableness of the calibration results of the entire calibration system. Based on the model, the voltage value of the standard side and the calibrated side can be compared remotely by measuring the time deviation between the pulse signal converted from voltage and the GPS synchronous clock signal. The voltage difference between the two sides is obtained and the remote calibration of dc voltage sources is implemented. By experiments, the voltage difference derived by the remote calibration model and measured by the traditional calibration method can be obtained when the calibration point is 0–1 V. The discrepancy between the results of the two methods is within
$7.4244\times 10^{-5}$
V. The verification results of the two methods for the same dc voltage source are consistent in the evaluation of the accuracy level. It verifies the efficiency of the proposed system and the accuracy of the calibration model.