摘要
Two methods for smoothing pseudorange observable by Carrier and Doppler are discussed. Then the procedure based on the RINEX observation files is tested using the Ashtech Z-XII3T geodetic receivers driven by a stable external frequency at UNSO. This paper proposes to adapt this procedure for the links between geodetic receivers, in order to take advantage of the P codes available on L 1 and L 2. This new procedure uses the 30-second RINEX observations files, the standard of the International GPS Service (IGS), and processes the ionosphere-free combination of the codes P 1 and P 2; the satellite positions are deduced from the IGS rapid orbits, available after two days.
Two methods for smoothing pseudorange observable by Carrier and Doppler arediscussed. Then the procedure based on the RINEX observation files is tested using the AshtechZ-XII3T geodetic receivers driven by a stable external frequency at UNSO. This paper proposes toadapt this procedure for the links between geodetic receivers, in order to take advantage of the Pcodes available on L_1 and L_2. This new procedure uses the 30-second RINEX observations files, thestandard of the International GPS Service (IGS), and processes the ionosphere-free combination ofthe codes P_1 and P_2; the satellite positions are deduced from the IGS rapid orbits, availableafter two days.
基金
Funded by the Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, China( No.02 09 0.5) and the National Natural ScienceFoundation of China (No.40174005).
