GNSS大气掩星电离层修正方法研究

Research on Ionosphere Calibration Methods in GNSS Atmospheric Radio Occultation

对四种主要的电离层修正方法的修正效果进行了对比分析,理论及模拟分析结果表明:由于对伪距的测量精度较低,简单的单频电离层修正法误差较大,一般只对单频接收机或者载波L2的观测数据缺失或质量较差时应用;在双频电离层修正方法中,相位线性组合法由于没有考虑电离层色散引起的电波路径差别,修正效果不如另外几种双频修正方法,多在地面导航中进行高仰角观测时应用。弯曲角线性组合法的修正效果最好,优于其他电离层修正方法。

In this paper, the calibration principles of ionosphere calibration methods are described in detailed, and the effects of these methods are analyzed by using simulating method. The results are as follows： the calibration error of single frequency ionosphere cali- bration method is large because the precision of pseudo range is bad. This method is worked when the receiver has only one frequency or there was not L2 data. In the methods of double frequency calibration methods, A combination of L1 and L2 phase method is worst because it is not considerable of the difference of two radio waves~ propagating paths. A linear combi- nation of L1 and L2 bending angle is the best method of all the ionosphere calibration meth- ods.