GPS双频观测值差分码偏差估计及精度分析

Differential Code Bias Estimation and Accuracy Analysis Based on Dual-Frequency GPS Observations

接收机仪器偏差中的码偏差是影响电离层中电子总含量求解精度的重要因素,若忽略仪器的码偏差对电离层的影响,将会给电子含量的求解带来9～30TECU偏差,因此对接收机码偏差的精确求解至关重要.本文基于6个欧洲站6天的GPS双频观测数据,在最小二乘的基础下,联合4阶球谐函数模型估算接收机中的差分码偏差,将求解的结果与CODE分析中心电离层产品所给出的结果进行对比分析,并对接收机差分码偏差估算的结果进行精度的评定,结果表明:文中估算方法所得的结果与CODE分析中心中电离层产品给出的结果基本一致,且估算的精度较高,因此,该方法对差分码偏差的提取具有一定的有效性.

The code bias in the receiver instrument deviation is an important factor affecting the accuracy of the total electron content in the ionosphere.If the effect of the code bias of the instrument on the ionosphere is ignored,the 9～30 TECU deviation can be brought to the solution of the electron content,so the exact solution of the machine code deviation is crucial.This paper uses 6-day GPS dual-frequency observation data and joints spherical harmonic model to estimate the differential code bias in the receiver on the basis of least squares.The results are compared and analyzed with the solution given by the CODE analysis center ionosphere product,at the same time,this paper also evaluats the accuracy of receiver differential code bias estimation.The results show that the results obtained by the estimation method in the paper are basically consistent with the results given by the ionosphere products in the CODE analysis center,and the estimated accuracy is quite high,therefore,this method has certain validity for the extraction of differential code bias.