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??RINEX HO???????GPS?????λ?????е???(?????????)????????????????????GPS???????е??????????(ΔI_H)^p,q_i,g??????????(ΔI_H)^p,q_i,g????γ?????????????????????????????????????????????????????￡???Bernese 5.0???????????????????????????????δ???и????????????????????л????????????????????????????????Δb_H???????????Δb_H???????С????????????????????Δ??b??H??????????????????????????????????????????ε??С??Δb_H?????????

Higher-Order Ionospheric Effects on the GPS Double Difference Observation and Baseline Vectors

Ionospheric 2nd-order and 3rd-order items of GPS observation are calculated by RINEX HO software. On this basis, higher-order ionospheric delay  (ΔI_H)^p,q_i,g of the GPS double difference observation is determined. The relationship between (ΔI_H)^p,q_i,g and geomagnetic latitude, baseline length, baseline direction and the sun''s activity level are studied. Then, under the assumption that other conditions are the same, the Bernese 5.0 software are applied to the baseline solution for the observed values, both under and not under the higher-order ionospheric delay correction. Higher-order ionospheric effects on baseline vectors Δb_H are calculated. The results show that the value of Δb_H is very small and can be ignored in the general case. Δb_H has no exact relationship with the factors such as baseline length, solar activity level and so on, but with the decrease of the time, Δb_H will increase.