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The algorithm of smoothing pseudo-range with carrier phase and its application to the dual ranging and time synchronization (DRTS) system are introduced. The calculation and analyses of the measured data show that the application of the algorithm of smoothing pseudo-range with carrier phase to the DRTS can improve the ranging accuracy of DRTS. The processing methods for the pseudo-code mistakes and carrier phase leaps which occurred during the measurements and also given in this paper, and the simulation and analyses show that these methods can reduce the error caused by the pseudo-code mistakes and carrier phase leaps. Introduction The realization of Aerospace integration, together with the high accuracy time synchronization measurement and control platform, needs DRTS system to provide high accuracy time synchronization service for them. DRTS system can obtain respective relative pseudo range by signal transmitter and receiver, which mounted on two ranging terminals, performing pseudo code measurement and carrier phase measurement. In this ranging method, since the transmitting path and the receiving path of ranging signal are substantially the same but in the opposite direction, thus this ranging mode can eliminate the error caused by the difference between transmitting paths as much as possible, thus precise ranging and time synchronization between these two ranging terminals can be achieved [1-4] . However, the pseudo range measurements obtained through pseudo code ranging contains a considerable amount of measurement noise, which lowers the accuracy of ranging; and although the pseudo range measurements obtained through carrier phase ranging has relatively high measurement accuracy, it also has integer ambiguity and cycle slip of phase. Therefore, the accuracy of DRTS system can be greatly improved if using the high accuracy carrier phase ranging measurements to smooth the pseudo code ranging measurements. The Principle of Carrier Phase Smoothing Carrier phase smoothing is a high accuracy ranging method which combines the respective advantages of pseudo code ranging and carrier phase ranging. The ranging equations of pseudo code ranging and carrier phase ranging can be expressed as follows:

Application of Algorithm of Smoothing Pseudo-range with Carrier Phase to DRTS System