一种改进的混合差分实时GPS卫星钟差估计算法及其实现
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摘要
提出一种改进的混合差分算法,实现实时GPS卫星钟差估计。算法实现过程主要采用4个解算步骤,最终生成播发至用户的实时钟差产品。利用全球分布的68个测站实时数据流进行GPS卫星实时钟差解算,并对2018-01-14～01-19的实时GPS卫星钟差产品采用2种方法进行检核:1)与IGS快速钟差产品比较;2)运用实时动态PPP结果检核。结果显示,基于改进的混合差分算法,利用实时数据流实现的GPS实时卫星钟差产品具备STD为0.15 ns、RMS为0.63 ns的精度,可提供实时cm级定位服务。
As the service capabilities of the GPS system has improved steadily, and with the increasing demand for real-time positioning service, real-time satellite clock products are gaining more attention by experts and scholars in relevant fields. In this paper, we implement real-time GPS satellite clock offset estimation based on a modified mixed-differenced algorithm. The realization of this method consists of four steps, which can generate final real-time satellite clock offset products for users. The real-time clock product of GPS satellites is solved using real-time stream data from 68 globally distributed stations. For the generated real-time GPS satellite clock products from Jan 14 to Jan 19, 2018, two ways are used to evaluate the products: first, comparing with the IGS rapid clock offset products; and second, applying the products in real-time kinematic PPP. We verify that the real-time clock product based on the modified mixed-differenced algorithm can reach accuracy of about STD 0.15 ns, RMS 0.63 ns. It can provide real-time centimeter-level positioning service.
As the service capabilities of the GPS system has improved steadily, and with the increasing demand for real-time positioning service, real-time satellite clock products are gaining more attention by experts and scholars in relevant fields. In this paper, we implement real-time GPS satellite clock offset estimation based on a modified mixed-differenced algorithm. The realization of this method consists of four steps, which can generate final real-time satellite clock offset products for users. The real-time clock product of GPS satellites is solved using real-time stream data from 68 globally distributed stations. For the generated real-time GPS satellite clock products from Jan 14 to Jan 19, 2018, two ways are used to evaluate the products: first, comparing with the IGS rapid clock offset products; and second, applying the products in real-time kinematic PPP. We verify that the real-time clock product based on the modified mixed-differenced algorithm can reach accuracy of about STD 0.15 ns, RMS 0.63 ns. It can provide real-time centimeter-level positioning service.
引文
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[5] Li X X, Dick G, Lu C X, et al. Multi-GNSS Meteorology: Real-Time Retrieving of Atmospheric Water Vapor from Beidou, Galileo, GLONASS, and GPS Observations[J]. IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(12): 6 385-6 393
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[9] Zhang X H, Li X X, Guo F. Satellite Clock Estimation at 1 Hz for Realtime Kinematic PPP Applications[J]. GPS Solutions, 2011, 15(4): 315-324
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[11] Zhang Q, Moore P, Hanley J, et al. Auto-BAHN: Software for Near Real-Time GPS Orbit and Clock Computations[J]. Advances in Space Research, 2007, 39(10): 1 531-1 538
[12] Gong X P, Gu S F, Lou Y D, et al. An Efficient Solution of Real-Time Data Processing for Multi-GNSS Network[J]. Journal of Geodesy, 2018,92(7):797-809
[13] 陈良, 胡志刚, 耿长江, 等. GNSS 增强系统中精密实时钟差高频估计及应用研究[J]. 测绘学报, 2016, 45(增2): 12-21(Chen Liang,Hu Zhigang,Geng Changjiang, et al.Study on a High-Frequence Multi-GNSS Real-Time Precise Clock Estimation Algorithm and Application in GNSS Augment System[J].Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 12-21)
[14] Kazmierski K, So?nica K, Hadas T. Quality Assessment of Multi-GNSS Orbits and Clocks for Real-Time Precise Point Positioning[J]. GPS Solutions, 2018, 22(1):11
[15] Wang Z Y, Li Z S, Wang L, et al. Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers[J]. ISPRS International Journal of Geo-Information, 2018, 7(3): 85
[16] Agrotis L, Sanz P A, Dow J, et al. ESOC’s RETINA System and the Generation of the IGS RT Combination[C]. IGS Workshop,Newcastle Upon Tyne, 2010
[2] Caissy M, Agrotis L, Weber G, et al. The International GNSS Real-Time Service[J]. GPS World, 2012,23(6):52-58
[3] Dai Z Q, Zhao Q L, Lü Y F, et al. The Wide- and Local-Area Combined GNSS Real-Time Precise Positioning Service System and Products[C]. China Satellite Navigation Conference,Shanghai,2017
[4] Li X X, Ge M R, Dai X L, et al. Accuracy and Reliability of Multi-GNSS Real-Time Precise Positioning: GPS, GLONASS, Beidou, and Galileo[J]. Journal of Geodesy, 2015, 89(6): 607-635
[5] Li X X, Dick G, Lu C X, et al. Multi-GNSS Meteorology: Real-Time Retrieving of Atmospheric Water Vapor from Beidou, Galileo, GLONASS, and GPS Observations[J]. IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(12): 6 385-6 393
[6] Teferle N, Ding W W, Abraha K E, et al. Multi-GNSS Benefits to Real-Time and Long-Term Monitoring Applications[C]. IAG/CPGPS International Conference on GNSS+, Shanghai, 2016
[7] Ge M R, Chen J P Dou?a J, et al. A Computationally Efficient Approach for Estimating High-Rate Satellite Clock Corrections in Realtime[J]. GPS Solutions, 2012, 16(1): 9-17
[8] Hauschild A, Montenbruck O. Kalman-Filter-Based GPS Clock Estimation for Near Real-Time Positioning[J]. GPS Solutions, 2009, 13(3): 173-182
[9] Zhang X H, Li X X, Guo F. Satellite Clock Estimation at 1 Hz for Realtime Kinematic PPP Applications[J]. GPS Solutions, 2011, 15(4): 315-324
[10] Laurichesse D, Cerri L, Berthias J P, et al. Real Time Precise GPS Constellation and Clocks Estimation by Means of a Kalman Filter[C]. ION GNSS,Nashville, 2013
[11] Zhang Q, Moore P, Hanley J, et al. Auto-BAHN: Software for Near Real-Time GPS Orbit and Clock Computations[J]. Advances in Space Research, 2007, 39(10): 1 531-1 538
[12] Gong X P, Gu S F, Lou Y D, et al. An Efficient Solution of Real-Time Data Processing for Multi-GNSS Network[J]. Journal of Geodesy, 2018,92(7):797-809
[13] 陈良, 胡志刚, 耿长江, 等. GNSS 增强系统中精密实时钟差高频估计及应用研究[J]. 测绘学报, 2016, 45(增2): 12-21(Chen Liang,Hu Zhigang,Geng Changjiang, et al.Study on a High-Frequence Multi-GNSS Real-Time Precise Clock Estimation Algorithm and Application in GNSS Augment System[J].Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 12-21)
[14] Kazmierski K, So?nica K, Hadas T. Quality Assessment of Multi-GNSS Orbits and Clocks for Real-Time Precise Point Positioning[J]. GPS Solutions, 2018, 22(1):11
[15] Wang Z Y, Li Z S, Wang L, et al. Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers[J]. ISPRS International Journal of Geo-Information, 2018, 7(3): 85
[16] Agrotis L, Sanz P A, Dow J, et al. ESOC’s RETINA System and the Generation of the IGS RT Combination[C]. IGS Workshop,Newcastle Upon Tyne, 2010