A GPS Bit Synchronization Method Based on Frequency Compensation

Xinning LIU; Yuxiang NIU; Jun YANG; Peng CAO

doi:10.1587/transcom.E98.B.746

A GPS Bit Synchronization Method Based on Frequency Compensation

Xinning LIU, Yuxiang NIU, Jun YANG, Peng CAO

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TTFF (Time-To-First-Fix) is an important indicator of GPS receiver performance, and must be reduced as much as possible. Bit synchronization is the pre-condition of positioning, which affects TTFF. The frequency error leads to power loss, which makes it difficult to find the bit edge. The conventional bit synchronization methods only work well when there is no or very small frequency error. The bit synchronization process is generally carried out after the pull-in stage, where the carrier loop is already stable. In this paper, a new bit synchronization method based on frequency compensation is proposed. Through compensating the frequency error, the new method reduces the signal power loss caused by the accumulation of coherent integration. The performances of the new method in different frequency error scenarios are compared. The parameters in the proposed method are analyzed and optimized to reduce the computational complexity. Simulation results show that the new method has good performance when the frequency error is less than 25Hz. Test results show that the new method can tolerate dynamic frequency errors, and it is possible to move the bit synchronization to the pull-in process to reduce the TTFF.

Publication: IEICE TRANSACTIONS on Communications Vol.E98-B No.4 pp.746-753

Publication Date: 2015/04/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E98.B.746

Type of Manuscript: PAPER

Category: Navigation, Guidance and Control Systems

Authors

Xinning LIU
  Southeast University
Yuxiang NIU
  Southeast University
Jun YANG
  Southeast University
Peng CAO
  Southeast University

Keyword

GPS, bit synchronization, coherent accumulation, frequency compensation

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Xinning LIU, Yuxiang NIU, Jun YANG, Peng CAO, "A GPS Bit Synchronization Method Based on Frequency Compensation" in IEICE TRANSACTIONS on Communications, vol. E98-B, no. 4, pp. 746-753, April 2015, doi: 10.1587/transcom.E98.B.746.
Abstract: TTFF (Time-To-First-Fix) is an important indicator of GPS receiver performance, and must be reduced as much as possible. Bit synchronization is the pre-condition of positioning, which affects TTFF. The frequency error leads to power loss, which makes it difficult to find the bit edge. The conventional bit synchronization methods only work well when there is no or very small frequency error. The bit synchronization process is generally carried out after the pull-in stage, where the carrier loop is already stable. In this paper, a new bit synchronization method based on frequency compensation is proposed. Through compensating the frequency error, the new method reduces the signal power loss caused by the accumulation of coherent integration. The performances of the new method in different frequency error scenarios are compared. The parameters in the proposed method are analyzed and optimized to reduce the computational complexity. Simulation results show that the new method has good performance when the frequency error is less than 25Hz. Test results show that the new method can tolerate dynamic frequency errors, and it is possible to move the bit synchronization to the pull-in process to reduce the TTFF.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E98.B.746/_p

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@ARTICLE{e98-b_4_746,
author={Xinning LIU, Yuxiang NIU, Jun YANG, Peng CAO, },
journal={IEICE TRANSACTIONS on Communications},
title={A GPS Bit Synchronization Method Based on Frequency Compensation},
year={2015},
volume={E98-B},
number={4},
pages={746-753},
abstract={TTFF (Time-To-First-Fix) is an important indicator of GPS receiver performance, and must be reduced as much as possible. Bit synchronization is the pre-condition of positioning, which affects TTFF. The frequency error leads to power loss, which makes it difficult to find the bit edge. The conventional bit synchronization methods only work well when there is no or very small frequency error. The bit synchronization process is generally carried out after the pull-in stage, where the carrier loop is already stable. In this paper, a new bit synchronization method based on frequency compensation is proposed. Through compensating the frequency error, the new method reduces the signal power loss caused by the accumulation of coherent integration. The performances of the new method in different frequency error scenarios are compared. The parameters in the proposed method are analyzed and optimized to reduce the computational complexity. Simulation results show that the new method has good performance when the frequency error is less than 25Hz. Test results show that the new method can tolerate dynamic frequency errors, and it is possible to move the bit synchronization to the pull-in process to reduce the TTFF.},
keywords={},
doi={10.1587/transcom.E98.B.746},
ISSN={1745-1345},
month={April},}

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TY - JOUR
TI - A GPS Bit Synchronization Method Based on Frequency Compensation
T2 - IEICE TRANSACTIONS on Communications
SP - 746
EP - 753
AU - Xinning LIU
AU - Yuxiang NIU
AU - Jun YANG
AU - Peng CAO
PY - 2015
DO - 10.1587/transcom.E98.B.746
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E98-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2015
AB - TTFF (Time-To-First-Fix) is an important indicator of GPS receiver performance, and must be reduced as much as possible. Bit synchronization is the pre-condition of positioning, which affects TTFF. The frequency error leads to power loss, which makes it difficult to find the bit edge. The conventional bit synchronization methods only work well when there is no or very small frequency error. The bit synchronization process is generally carried out after the pull-in stage, where the carrier loop is already stable. In this paper, a new bit synchronization method based on frequency compensation is proposed. Through compensating the frequency error, the new method reduces the signal power loss caused by the accumulation of coherent integration. The performances of the new method in different frequency error scenarios are compared. The parameters in the proposed method are analyzed and optimized to reduce the computational complexity. Simulation results show that the new method has good performance when the frequency error is less than 25Hz. Test results show that the new method can tolerate dynamic frequency errors, and it is possible to move the bit synchronization to the pull-in process to reduce the TTFF.
ER -