A Novel Method To Extend Coherent Integration for Weak GPS Signal Acquisition

In order to enhance the sensitivity of Global Positioning System receivers, increasing the coherent integration time in the acquisition process is necessary. This letter analyzes the limitation to coherent integration in acquisition algorithms due to the bit sign transition of navigation data and proposes a novel time parallel acquisition algorithm with transition detection (denoted as TPATD) to overcome the bit sign transition limitation. Fast Fourier transform operation is applied to the proposed TPATD algorithm to search the code delay in parallel. Meanwhile, the algorithm extends the coherent integration time to one entire navigation data bit duration. Simulation results demonstrate the effectiveness of the proposed algorithm. The receiver operating characteristic curves show that the TPATD algorithm outperforms the existing acquisition techniques.

[1]  Wei Guo,et al.  Efficient Differential Coherent Accumulation Algorithm for Weak GPS Signal Bit Synchronization , 2013, IEEE Communications Letters.

[2]  Olivier Julien,et al.  Optimal GNSS acquisition parameters when considering bit transitions , 2014, 2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014.

[3]  M. Psiaki.  Block Acquisition of Weak GPS Signals in a Software Receiver , 2001 .

[4]  S. Turunen.  Acquisition of satellite navigation signals using dynamically chosen measurements , 2010 .

[5]  Letizia Lo Presti,et al.  Mean acquisition time of GNSS peer-to-peer networks , 2012, 2012 International Conference on Localization and GNSS.

[6]  Letizia Lo Presti,et al.  GNSS Signal Acquisition in the Presence of Sign Transition , 2009, IEEE Journal of Selected Topics in Signal Processing.

[7]  Li Weibi.  Bit-flipping prediction acquisition algorithm of weak GPS signal , 2013 .

[8]  Karthik Ramasubramanian,et al.  Spur Mitigation in High-Sensitivity GNSS Receivers , 2014, IEEE Transactions on Circuits and Systems II: Express Briefs.

[9]  Wei Zhang,et al.  Bit-flipping prediction acquisition algorithm of weak GPS signal: Bit-flipping prediction acquisition algorithm of weak GPS signal , 2013 .

[10]  Xiangning Fan,et al.  GNSS signal acquisition in weak signal condition , 2014, 2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP).

[11]  D. Borio,et al.  Noncoherent Integrations for GNSS Detection: Analysis and Comparisons , 2009, IEEE Transactions on Aerospace and Electronic Systems.