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Evaluation of the Effect of Higher-Order Ionospheric Delay on GPS Precise Point Positioning Time Transfer
Remote Sensing ( IF 5 ) Pub Date : 2020-07-02 , DOI: 10.3390/rs12132129
Haiyan Yang , Xuhai Yang , Zhe Zhang , Baoqi Sun , Weijin Qin

In high-precision GPS precise point positioning (PPP) time transfer, errors caused by the effect of ionosphere delay have to be corrected. Usually the ionosphere-free combinations of the pseudo code and the carrier phase is used in GPS PPP data processing, and it effectively eliminates the effect of the first-order ionospheric delay. This study quantitatively analyzes the errors caused by higher-order ionospheric (Ion2+) delays in precise PPP time transfer. Data of two 7-day test periods, including low and moderate ionospheric conditions, from 20 stations located in middle- and low-latitude, were analyzed. The difference in clock solution with and without the Ion2+ correction, including the receiver clock solution and time-link clock solution, was deeply analyzed and discussed. The difference sequence shows a constant bias plus some variations with a diurnal variation. For the difference of the receiver clock solutions, the mean standard deviation of the variations is 3.92 ps in low-latitude, which is much larger than that of 2.59 ps in mid-latitude due to the influence of the larger ionospheric electron density on the low-latitude. The maximum constant bias reached more than 15 ps and was negative at most stations in the northern hemisphere, while it was positive at most stations located in the southern hemisphere. The difference in the time-link solutions correlates not only with time and region, but also with the length of the time-links. The largest difference in the long time-link SYDN-PTBB, BJNM-SYDN, AMC2-SYDN, etc., reaches more than 25 ps, while that of the short time-link IENG-PTBB, BRUX-PTBB, etc., is less than 3.5 ps. Therefore, the Ion2+ correction is necessary for high-precision PPP time transfer over long time-links, especially time-links made by one station located in the northern hemisphere and another located in the south hemisphere; however, it could be ignored for short time-links.

中文翻译:

高阶电离层延迟对GPS精确点定位时间传递的影响评估

在高精度GPS精确点定位(PPP)时间传输中,必须纠正由于电离层延迟的影响而引起的误差。通常在GPS PPP数据处理中使用伪代码和载波相位的无电离层组合,它可以有效消除一阶电离层延迟的影响。这项研究定量分析了精确PPP时间传输中由高阶电离层(Ion2 +)延迟引起的误差。分析了来自中纬度和低纬度的20个站点的两个7天测试期的数据,包括低和中度电离层条件。深入分析和讨论了带和不带Ion2 +校正的时钟解决方案的差异,包括接收器时钟解决方案和时间链路时钟解决方案。差异序列显示出恒定的偏差加上一些日变化。对于接收器时钟解决方案的差异,由于较大的电离层电子密度对低纬度的影响,低纬度变化的平均标准偏差为3.92 ps,比中纬度为2.59 ps大得多。 -纬度。最大恒定偏差达到15 ps以上,在北半球的大多数观测站为负,而在南半球的大多数观测站为正。时间链接解决方案中的差异不仅与时间和区域相关,而且与时间链接的长度相关。长时链路SYDN-PTBB,BJNM-SYDN,AMC2-SYDN等的最大差异超过25 ps,而短时链路IENG-PTBB,BRUX-PTBB等的差异最大,小于3.5 ps。因此,Ion2 +校正对于长时间链接上的高精度PPP时间传输是必要的,特别是北半球一个站和南半球另一个站进行的时间链接;但是,对于短时间链接,可以忽略它。
更新日期:2020-07-02
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