使用抛物面定向天线分析北斗三号星上伪距和 载波测距偏差.

Objectives: For global navigation satellite system (GNSS), the ranging performance of observation would influence the system service capability.Methods: Parabolic antenna with large⁃diameter could greatly reduce the impact of the ground equipment and the environment on signal acquisition. Based on data from parabolic antenna, observation characteristics and ranging performance of BeiDou⁃3 global satellite navigation system (BDS⁃3) are analyzed.Results: The results show that, regarding the pseudorange deviation on BeiDou⁃3 satellite, no systematic deviation of the same magnitude, compared with BeiDou⁃2, is found on the signal of B1I, B3I, B1C, B2a, and B2b. There are fluctuations on some signals. However, the correlation with elevation angle is not strong, and the average magnitude of all satellite fluctuations is 0.1 m. This paper analyzes the multipath variation and noise level of carrier observation for BeiDou⁃3 satellite of each signal using triple⁃frequency combinations. The fluctuations of carrier phase triple combination are of the millimeter level, and those fluctuations do not closely correlate with the elevation or time. The root mean square of the triple⁃frequency carrier combination from parabolic antenna is mostly less than 0.6 mm.Conclusions: The results indicate that no systematic bias occurs in code and phase observation of BDS⁃3, and the system has a good ranging performance. [ABSTRACT FROM AUTHOR]