Satellite common-view comparison of two types of unequal precision data

Abstract

The pseudorange and carrier phase are two basic measurements of the GNSS receiver, both of them are different and complementary, The accuracy of pseudorange from a few meters to a few decimeters, which are frequently used in the low precision of the common-view comparison, it has the advantages of high speed and simple data processing. The carrier phase observation value actually represents the phase difference between the reference signals generated by the receiver. It is a carrier signal with Doppler shift and its accuracy is up to millimeter, It is often used in the high-accuracy of common-view comparison. But it exists the ambiguity uncertain problem, greatly increasing the difficulty of data processing. In this paper, two kinds of precision measurement methods are presented. one is direct using pseudorange observation value to common-view comparison, and the other is using the carrier phase value to smooth the pseudo-range observation value. After relevant experiments analysis, using the original pseudorange measurements, the standard deviation of the difference is 1.0 m, and the standard deviation of the difference is 0.46 m after the carrier phase to smooth the pseudo-range observation value, and the result comparison is improved obviously. Finally, in the experiment of short baseline, using original pseudorange the standard deviation of the common-view comparison is 1.90 ns and using the carrier phase smoothing pseudorange is 1.18 ns, It is show that the uncertainty of carrier phase smoothing pseudorange measurement is better than that of pseudorange method.