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A High-Sensitivity Acquisition Algorithm for BeiDou Signals with NH Code

  • Rongbing Li (a1), Zhifeng Han (a1) (a2), Jianye Liu (a1) and Yi Wang (a1)

BeiDou signals are modulated with a Neumann-Hofman (NH) code of 1 kbps. The frequent bit transitions lead to a sensitivity attenuation of classic acquisition algorithms. In order to increase acquisition sensitivity for weak BeiDou signals, a novel algorithm based on modified zero-padding and differential correlation is proposed. First, a zero-padding method is used to weaken the effect of NH code. Second, the differential coherent delay time is modified to 20 ms to remove the influence of data bit transitions. The integration time is extended to 10 ms to increase acquisition sensitivity. Finally, Monte Carlo simulations and real data tests are conducted to analyse the performance of the proposed algorithm. Simulated results show that the proposed acquisition algorithm outperforms traditional algorithms under a Carrier-to-Noise ratio (C/N0s) of 20~38 dB-Hz. The sensitivity of the proposed algorithm is about 10dB higher than traditional 6 ms repeated search algorithms. Real data test results show that the proposed algorithm outperforms the traditional method with weak signals. This algorithm can remove the effect of NH code and effectively increase the acquisition sensitivity. The proposed algorithm is suitable for acquisition of weak BeiDou signals.

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Bhuiyan, M. Z. H., Söderholm, S., Thombre, S., Ruotsalainen, L. and Kuusniemi, H. (2014). Overcoming the challenges of BeiDou receiver implementation. Sensors, 14(11), 2208222098.
Borio, D., O'Driscoll, C. and Lachapelle, G. (2009). Coherent, noncoherent, and differentially coherent combining techniques for acquisition of new composite GNSS signals. IEEE Transactions on Aerospace and Electronic Systems, 45, 12271239.
Borio, D. (2011). M-sequence and secondary code constraints for GNSS signal acquisition. IEEE Transactions on Aerospace & Electronic Systems, 47(2), 928945.
China Satellite Navigation Office. (2016). BeiDou Navigation Satellite System Signal in Space Interface Control Document Open Service Signal (Version 2.1). Available online:
European GNSS (Galileo) Open Service Signal. (2015). Space Interface Control Document, OS SIS ICD, Iss.1.2, European Union.
Han, Z., Liu, J., Li, R., Zeng, Q. and Wang, Y. (2017). A Modified Differential Coherent Bit Synchronization Algorithm for BeiDou Weak Signals with Large Frequency Deviation. Sensors, 17(7), 15681585.
Hegarty, C., Tran, M. and Van Dierendonck, A.J. (2003). Acquisition Algorithms for the GPS L5 Signal. ION GNSS 2003, Institute of Navigation, Portland, OR, USA, September 9–12, 165177.
Hegarty, C. (2006). Optimal and Near-Optimal Detectors for Acquisition of the GPS L5 Signal. Proceedings of the U.S. Institute of Navigation NTM, Jan, 717725.
Kaplan, E and Hegarty, C. (2005). Understanding GPS: Principles and Application 2nd edn. Artech House Inc, Boston
Musumeci, L., Dovis, F., Silva, J. S., Silva, P. F. D. and Lopes, H. D. (2016). Design of a high sensitivity gnss receiver for lunar missions. Advances in Space Research, 57(11), 22852313.
Teunissen, P. and Montenbruck, O. Eds. (2017). Springer Handbook of Global Navigation Satellite Systems. Springer.
Tsui, J. B. Y. (2005). Fundamentals of Global Positioning System Receivers: A Software Approach. 2nd edn. Wiley, New York.
Van Dierendonck, A. J. (2000). The new l5 civil GPS signal. Gps World.11(9):64.
Wang, X., Ji, X. and Feng, S. (2014) A scheme for weak GPS signal acquisition aided by SINS information. GPS Solutions, 18(2), 243252.
Wang, X., Ji, X., Feng, S. and Calmettes, V. (2015). A high-sensitivity GPS receiver carrier-tracking loop design for high-dynamic applications. GPS Solutions 19(2), 225236.
Xie, F., Sun, R., Kang, G., Qian, W., Zhao, J. and Zhang, L. (2017). A jamming tolerant BeiDou combined B1/B2 vector tracking algorithm for ultra-tightly coupled GNSS/INS systems. Aerospace Science and Technology, 70, 265276.
Xie, P. and Petovello, M.G. (2015). Improved Correlator Peak Selection for GNSS Receivers in Urban Canyons. The Journal of Navigation, 68(05), 869886.
Yang, C. (2003). FFT-Based Fast Direct Acquisition of New Civil GPS Signals. U.S. PTO Disclosure Document No. 539, 039, September 2003.
Yang, C., Hegarty, C. and Tran, M. (2004) Acquisition of the GPS L5 signal using coherent combining of I5 and Q5. ION GNSS 2004, Institute of Navigation, Long Beach, CA, USA, September 21–24, 21842195.
Yu, W., Zheng, B., Watson, R. and Lachapelle, G. (2007) Differential combining for acquiring weak GPS signals. Signal Processing, 87(5), 824840.
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The Journal of Navigation
  • ISSN: 0373-4633
  • EISSN: 1469-7785
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