Analysis of uncertainty in time traceability links using GPS common view and optical fiber techniques

In a test field of satellite navigation system, two different time traceability links were built base on the GPS common-view (GPS CV) and optical fibers time transfer techniques. Both techniques are utilized to compare the test field time (TFT) with UTC(NTSC). A time traceability link must be calibrated and detection to assure the system time traceability accuracy and stability. In many cases, calibration campaigns have been very infrequent due to the expense and lack of suitable equipment. The paper is devoted to study the uncertainty of the test field's both traceability links which are under real environmental conditions and without influencing of the normal operation of the time traceability inks. Our results show that the uncertainty of GPS common-view traceability link results is estimated as 3ns and optical fiber link(57km) is better than 0.2ns. The results can be used for the traceability links inter calibrated, abnormal detection and studying the two techniques fusion time traceability method.