Abstract
The Low earth orbiter (LEO) based navigation signal transmitters have advantages in fast-changing geometry and low free space signal loss, which can be served as a complementary or extension of current MEO/GEO based GNSS. Broadcasting navigation signals from LEO can significantly reduce the convergence time for the long baseline RTK\precise point positioning (PPP) and improve the signal strength. Hence LEO based navigation is considered as one of the key technology of next-generation positioning, navigation and timing (PNT) systems. This study assessed the pseudorange and carrier phase measurements observed from Luojia-1A satellite with the geometry-free combination method and the zero-baseline method. The assessment results indicate that the pseudorange precision variation subject to elevation angle is caused by both signal strength variation and multipath effect. The pseudorange measurement precision reaches 0.7 m and 0.8 m respectively for the dual frequency pseudorange measurements and the carrier phase precision is 2.8 mm and 2.6 mm respectively. Based on the data collected from Luojia-1A satellite, the challenges of LEO navigation augmentation data processing were addressed. The most distinguishing features of LEO navigation signals are their large signal strength variation, large Doppler variation and large acceleration variation. All these features have adversary effect on LEO signal processing and data processing, which has not been revealed. These challenges still need to be seriously investigated to further improve the performance of the LEO based navigation augmentation system.
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References
Borre K, Akos DM, Bertelsen N, Rinder P, Jensen SH (2007) A Software-Defined GPS and Galileo Receiver A Single-Frequency Approach. Birkhauser, Boston
Chen X, Allison T, Cao W, Ferguson K, Grunigh S, Gomez V, Kipka A, Kohler J, Laundau H, Leandro R, Lu G, Stolz R, Talbot N (2011) Trimble RTX, an Innovative New Approach for Network RTK. ION GNSS+2011, Portland, OR, pp 2214–2219
Dixon K (2006) StarFire™: A Global SBAS for Sub-Decimeter Precise Point Positioning. ION GNSS 2006, Fort Worth, Texas, pp 2286–2296
Ge H, Li B, Ge M, Zang N, Nie L, Shen Y, Schuh H (2018) Initial assessment of precise point positioning with LEO enhanced global navigation satellite systems (LeGNSS). Remote Sens 10:984
Guo S, Zhang D (2016) Analysis and comparison of satellite based augmentation system ‘Atlas’ and CORS network. Geospatial Inf 14:1–4
Leandro R, Landau H, Nitschke M, Glocker M, Seeger S, Chen X, Deking A, Bentahar M, Zhang F, Ferguson K (2011) RTX positioning: the next generation of cm-accurate real-time GNSS positioning. ION GNSS+2011, Portland, OR, p 1002-7
Li B, Ge H, Ge M, Nie L, Shen Y, Schuh H (2018a) LEO enhanced global navigation satellite system (LeGNSS) for real-time precise positioning services. Adv Space Res 63:73–93
Li X, Ma F, Li X, Lv H, Bian L, Jiang Z, Zhang X (2018b) LEO constellation-augmented multi-GNSS for rapid PPP convergence. J Geodesy
Meng Y, Bian L, Wang Y, Yan T, Lei W, He M, Li X (2018) Global navigation augmentation system based on Hongyan satellite constellation. Space Int 10
Reid TGR, Neish AM, Walter TF, Enge PK (2016) Leveraging commercial broadband LEO constellations for navigation. ION GNSS+2016, Portland, Oregon, pp 2300–2314
Wang L, Chen R, Li D, Yu B, Wu C (2018a) Quality Assessment of the LEO Navigation Augmentation Signals from Luojia-1A Satellite. Geomatics and Information science of Wuhan University
Wang L, Chen R, Li D, Zhang G, Shen X, Yu B, Wu C, Xie S, Zhang P, Li M, Pan Y (2018b) Initial assessment of the LEO based navigation signal augmentation system from Luojia-1A satellite. Sensors 18:3919
Wang L, Feng Y, Wang C (2013) Real-time assessment of GNSS observation noise with single receivers. J Glob Positioning Syst 12:73–82
Wang L, Yan X, Zhang Q, Huang G, Qin Z (2017) Discussion on technology of BDS Satellite orbit determination enhanced by LEO satellite. J Navig Positioning 5:51–57
Yang C (2018) Development plan for comprehensive positioning, navigation, timing system of Chinese Beidou navigation system. China Sci Technol Ind 2018:32–35
Zeng T, Sui L, Jia X, Ji G, Zhang Q (2017) Results and analysis of BDS precise orbit determination with the enhancement of Fengyun-3C. Acta Geodaetica Et Cartographic Sinica 46:824–833
Zhao Q, Wang C, Guo J, Yang G, Liao M, Ma H, Liu J (2017) Enhanced orbit determination for BeiDou satellites with FengYun-3C onboard GNSS data. GPS Solut 21:1–12
Acknowledgments
This research is support by the National Natural Science Foundation of China (NSFC 41704002, 91638203), China Postdoc Science Foundation (2017M620337) and the Fundamental Research Funds for the Central Universities.
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Wang, L., Chen, R., Xu, B., Zhang, X., Li, T., Wu, C. (2019). The Challenges of LEO Based Navigation Augmentation System – Lessons Learned from Luojia-1A Satellite. In: Sun, J., Yang, C., Yang, Y. (eds) China Satellite Navigation Conference (CSNC) 2019 Proceedings. CSNC 2019. Lecture Notes in Electrical Engineering, vol 563. Springer, Singapore. https://doi.org/10.1007/978-981-13-7759-4_27
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DOI: https://doi.org/10.1007/978-981-13-7759-4_27
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