二阶电离层延迟对GPS PPP时间传递的影响

doi:10.19665/j.issn1001-2400.2021.04.007

Abstract

Abstract:

In view of the practical problem that the second-order ionospheric delay error (Ion2) is not corrected in Precise Point Positioning (PPP) time transfer,the PPP observation equation with the Ion2 is derived.The PPP clocks and time transfer with and without the Ion2 correction are compared and analyzed using two test periods.Based on the measured data,analysis shows that the influence of the Ion2 on the PPP clocks at a low-latitude are more significant than that of mid-latitude and polar regions.The difference series of PPP clock solutions shows fixed deviation plus some diurnal variations,and the sign of fixed deviation is opposite in the northern and southern hemispheres.The maximum influence of the Ion2 on the long time-links transfer can be up to more than 26ps,but for the short time-links,it can be ignored.Therefore the Ion2 correction is necessary for sub-nanosecond PPP time transfer over long time-links,especially when the time-links are made by the stations located in low-latitude regions.

Key words: global positioning system, precise point positioning, second-order ionospheric delay, clocks, time transfer

CLC Number:

P127.1

DING Shuo,YANG Haiyan,YANG Xuhai,ZHANG Zhe,ZHAO Kunjuan. Influence of the second-order ionospheric delay on GPS PPP time transfer[J].Journal of Xidian University, 2021, 48(4): 50-56.

Figures/Tables 8

References 25

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测站名称	纬度	经度	接收机	天线
NYAL	78.93 N	11.87 E	TRIMBLE NETRS	AOAD/M_B
PTBB	52.30 N	10.46 E	ASHTECH Z-XII3T	ASH700936E
IENG	45.02 N	7.64 E	ASHTECH Z-XII3T	ASH701945C_M
AMC2	38.80 N	104.52 W	ASHTECH Z-XII3T	AOAD/M_T
KAT1	14.38 S	132.15 E	SEPT POLARX5	LEIAR25.R3
OHI3	63.32 S	57.90 W	LEICA GR25	LEIAR25.R4

测站	第71~79天		第171~179天
测站	固定偏差	标准差	固定偏差	标准差
AMC2	-6.43	4.22	-6.29	3.36
IENG	-5.33	3.49	-4.86	2.47
NYAL	-5.51	2.22	-5.84	2.24
PTBB	-4.49	3.43	-5.76	2.73
KAT1	14.50	6.25	4.81	3.10
OHI3	3.51	2.41	1.34	1.49

测站	第71~79天		第171~179天		基线长度/km
测站	固定偏差/ps	标准差/ps	固定偏差/ps	标准差/ps	基线长度/km
AMC2-PTBB	-1.94	8.27	-0.56	4.34	7 589.56
IENG-PTBB	-0.85	2.38	0.90	2.32	835.17
KAT1-PTBB	18.79	7.73	10.57	3.81	6 157.70
NYAL-PTBB	-1.02	3.08	-0.08	2.70	2 943.20
OHI3-PTBB	8.00	4.37	7.12	2.81	12 295.22

Influence of the second-order ionospheric delay on GPS PPP time transfer

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