High-Accuracy Method for Delay Calibration of UTC(NTSC) Replicating Device

The high accuracy time delay calibration of UTC(NTSC) replicating device is essentially a method to calibrate the delay of the device. Segmented calibration is used for the delay of the UTC(NTSC) replicating device. It combines relative calibration and absolute calibration, and a method of relative calibration for the delay of the device based on UTC (NTSC). Absolute calibration refers to demarcate the time delay of the antenna cable. Relative calibration refers to demarcate the time delay of the signal transmission delay and the receiver delay within the device based on UTC (NTSC). Specifically, UTC (NTSC) is used as the reference signal, and the time measurement equipment is used to measure the time bias between the PPS reproduced by UTC(NTSC) replicating device and UTC (NTSC), and the clock bias is calculated between the UTC(NTSC) replicating device and the reference equipment in the same time period. Thus, the relative delay of the UTC(NTSC) replicating device can be obtained, that is the time bias deducting the clock bias by collecting for 24-hour. By calibrating the device delay method, the timing accuracy of the UTC(NTSC) replicating device can be accurate to 0.2 ns.