Abstract
In the signal structure design of new global navigation satellite system (GNSS), the ideas of secondary/tiered code was introduced. However, due to the inherent vulnerability of satellite navigation signal, frequency interference (RFI) has become a potential threat. The continuous wave interference (CWI) has become one of the most serious interference types for the characteristics of power concentration, multiple types and wide distribution of the interference source. The impact assessment of CWI on the performance of navigation signals has become a hot spot of research. However, the existing assessment method lacks the quantitative evaluation for the effect of the secondary code on signal performance in the presence of CWI. To solve the above problems, the impact of tiered codes with different length on signal power spectrum was analyzed firstly, and then influence of tiered codes on tracking performance by discrete spectrum carrier-to-noise ratio was analyzed. The experimental results show that the traditional analysis model based on continuous spectrum is no longer suitable for navigation signal performance analysis under the condition of CWI; the smaller the line distance is, the two times the code period is doubled and the line spacing is 0.1 times that of the original; and when coherent integration time doubles and the tracking performance deteriorates 2–3 dB; and when length of tiered code increase, the tracking performance can improve 2–3 dB; and short coherent integration time and long tiered code should be used in receiver design. A compromise needs to be made between these two parameters to ensure the tracking performance under CWI and the robustness of receivers. The proposed method can provide effective theoretical guidance for the development of the new GNSS signal receiver.
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Acknowledgements
This work was supported by National Key Research and Development Plan of China (Grant No. 2016YFB0502402).
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Yang, J., Ye, H., Chen, X., Hui, S. (2018). Tracking Performance Assessment of Tiered Code Effect on GNSS Signal in the Presence of CWI. In: Sun, J., Yang, C., Guo, S. (eds) China Satellite Navigation Conference (CSNC) 2018 Proceedings. CSNC 2018. Lecture Notes in Electrical Engineering, vol 499. Springer, Singapore. https://doi.org/10.1007/978-981-13-0029-5_13
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DOI: https://doi.org/10.1007/978-981-13-0029-5_13
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