Efficient Weak Signals Acquisition Strategy for GNSS Receivers

Weijun LU; Yanbin ZHANG; Dengyun LEI; Dunshan YU

doi:10.1587/transcom.2015EBP3114

Efficient Weak Signals Acquisition Strategy for GNSS Receivers

Weijun LU, Yanbin ZHANG, Dengyun LEI, Dunshan YU

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The key factors in overcoming for weak global navigation satellite systems (GNSS) signal acquisition are sensitivity and dwell time. In the conventional MAX/TC criteria, a preset threshold value is used to determine whether the signal exists. Thus the threshold is calculated carefully to balance the sensitivity and the dwell time. Affected by various environment noise and interference, the acquisition circuit will enter verifying mode frequently to eliminate false alarms, which will extend the mean acquisition time (MAT). Based on the periodicity of spread spectrum code in GNSS, this paper presents an improved double-dwell scheme that uses no threshold in detecting weak GNSS signals. By adopting this method, the acquisition performance of weak signal is significantly improved. Theoretical analysis and numerical simulation are presented detailed. Compared with the conventional MAX/TC criteria, the proposed method achieves improved performance in terms of detection probability and false alarm rate. Furthermore, the MAT decreases 15s when C/N₀ is above 20dB-Hz. This can enhance the receiver sensitivity and shorten the time to first fix (TTFF).

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.1 pp.288-295

Publication Date: 2016/01/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2015EBP3114

Type of Manuscript: PAPER

Category: Navigation, Guidance and Control Systems

Authors

Weijun LU
  Beijing University of Posts and Telecommunications
Yanbin ZHANG
  Peking University
Dengyun LEI
  Peking University
Dunshan YU
  Peking University

Keyword

GNSS, acquisition, double-dwell, false alarm rate, mean acquisition time

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Weijun LU, Yanbin ZHANG, Dengyun LEI, Dunshan YU, "Efficient Weak Signals Acquisition Strategy for GNSS Receivers" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 1, pp. 288-295, January 2016, doi: 10.1587/transcom.2015EBP3114.
Abstract: The key factors in overcoming for weak global navigation satellite systems (GNSS) signal acquisition are sensitivity and dwell time. In the conventional MAX/TC criteria, a preset threshold value is used to determine whether the signal exists. Thus the threshold is calculated carefully to balance the sensitivity and the dwell time. Affected by various environment noise and interference, the acquisition circuit will enter verifying mode frequently to eliminate false alarms, which will extend the mean acquisition time (MAT). Based on the periodicity of spread spectrum code in GNSS, this paper presents an improved double-dwell scheme that uses no threshold in detecting weak GNSS signals. By adopting this method, the acquisition performance of weak signal is significantly improved. Theoretical analysis and numerical simulation are presented detailed. Compared with the conventional MAX/TC criteria, the proposed method achieves improved performance in terms of detection probability and false alarm rate. Furthermore, the MAT decreases 15s when C/N₀ is above 20dB-Hz. This can enhance the receiver sensitivity and shorten the time to first fix (TTFF).
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2015EBP3114/_p

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@ARTICLE{e99-b_1_288,
author={Weijun LU, Yanbin ZHANG, Dengyun LEI, Dunshan YU, },
journal={IEICE TRANSACTIONS on Communications},
title={Efficient Weak Signals Acquisition Strategy for GNSS Receivers},
year={2016},
volume={E99-B},
number={1},
pages={288-295},
abstract={The key factors in overcoming for weak global navigation satellite systems (GNSS) signal acquisition are sensitivity and dwell time. In the conventional MAX/TC criteria, a preset threshold value is used to determine whether the signal exists. Thus the threshold is calculated carefully to balance the sensitivity and the dwell time. Affected by various environment noise and interference, the acquisition circuit will enter verifying mode frequently to eliminate false alarms, which will extend the mean acquisition time (MAT). Based on the periodicity of spread spectrum code in GNSS, this paper presents an improved double-dwell scheme that uses no threshold in detecting weak GNSS signals. By adopting this method, the acquisition performance of weak signal is significantly improved. Theoretical analysis and numerical simulation are presented detailed. Compared with the conventional MAX/TC criteria, the proposed method achieves improved performance in terms of detection probability and false alarm rate. Furthermore, the MAT decreases 15s when C/N₀ is above 20dB-Hz. This can enhance the receiver sensitivity and shorten the time to first fix (TTFF).},
keywords={},
doi={10.1587/transcom.2015EBP3114},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - Efficient Weak Signals Acquisition Strategy for GNSS Receivers
T2 - IEICE TRANSACTIONS on Communications
SP - 288
EP - 295
AU - Weijun LU
AU - Yanbin ZHANG
AU - Dengyun LEI
AU - Dunshan YU
PY - 2016
DO - 10.1587/transcom.2015EBP3114
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2016
AB - The key factors in overcoming for weak global navigation satellite systems (GNSS) signal acquisition are sensitivity and dwell time. In the conventional MAX/TC criteria, a preset threshold value is used to determine whether the signal exists. Thus the threshold is calculated carefully to balance the sensitivity and the dwell time. Affected by various environment noise and interference, the acquisition circuit will enter verifying mode frequently to eliminate false alarms, which will extend the mean acquisition time (MAT). Based on the periodicity of spread spectrum code in GNSS, this paper presents an improved double-dwell scheme that uses no threshold in detecting weak GNSS signals. By adopting this method, the acquisition performance of weak signal is significantly improved. Theoretical analysis and numerical simulation are presented detailed. Compared with the conventional MAX/TC criteria, the proposed method achieves improved performance in terms of detection probability and false alarm rate. Furthermore, the MAT decreases 15s when C/N₀ is above 20dB-Hz. This can enhance the receiver sensitivity and shorten the time to first fix (TTFF).
ER -