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| Study on the Differential Calibration Techniques for the Internal Time Delays of the GPS Receivers for Time and Frequency Transfer |
| LIANG Kun,ZHANG Ai-min,GAO Xiao-xun |
| National Institute of Metrology, Beijing 100013, China |
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Abstract On the basis of BIPM differential calibration method, the modified calibration method that can be used to calibrate the receiver internal delay independently has been implemented. The calibration of one such receiver was carried out, a self-developed time transfer receiver, based on a Javad E_GGD GPS module, by the improved differential calibration method with respect to another time transfer receiver that had previously been calibrated, and a total calibration uncertainty of less than 6 nanosecond level can be acquired. The results of the differential calibration agree well with the ones of the absolute calibration formerly within 1ns.
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2012, Vol. 33 
