BDS作为我国自主研制的新一代卫星导航定位系统,率先播发了三个频率载波信号.随着BDS的逐渐成熟,利用三频观测值线性组合消除电离层二阶项延迟成为研究热点.该文讨论了伪距观测误差对电离层三频一阶项和三频二阶项的影响,得出伪距误差对三频二阶修正的影响远大于三频一阶修正的影响,在进行电离层误差修正时,如不能有效地提高伪距码的精度,应采用三频一阶改正或双频改正.%BDS as a new generation of satellite navigation and positioning system,which is independently developed by China, It broadcasts the three frequency carrier signals first. With the gradual maturity of BDS,using the linear combination of triple frequency observations to eliminate the delay of two order iono-sphere becomes a research hotspot. This paper discusses the effect to the triple frequency of one order and two order of ionospheric by pseudo range observation error. It obtains that the effect by the pseudo range er-ror to the correction of two order with triple-frequency is bigger than to the one order with triple-frequency. When the ionospheric error is corrected, if the accuracy of pseudo range code can not be improved effec-tively, the one orde with triple frequency correction or the dual frequency correction will be adopted.
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