GNSS signal acquisition in weak signal condition

Zhu, Can; Fan, X.

doi:10.1109/csndsp.2014.6923999

Cited by 4 publications

(2 citation statements)

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“…Therefore the circular correlation between r 2N (n) and l 2N (n) achieves a envelop peak at the correct code delay dwell when a bit sign transition occurs [7]. In order to increase the calculation speed, the circular correlation is evaluated by FFT operation.…”

Section: A Transition Acquisitionmentioning

confidence: 99%

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

Zhu

Fan

2015

IEEE Commun. Lett.

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In order to enhance the sensitivity of Global Positioning System (GPS) receivers, increasing the coherent integration time in acquisition process is necessary. This letter analyses 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 (FFT) 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 (ROC) curves show that TPATD algorithm outperforms the existing acquisition techniques.

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Section: A Transition Acquisitionmentioning

confidence: 99%

“…Ref. [7] gives a solution to data bit transition problem but it deals with Galileo E1 pilot signal for one primary code interval. Moreover, in order to acquire the satellites in weak signal environments, half bit acquisition algorithm is often used in GPS L1 C/A signal acquisition [8].…”

Section: Introductionmentioning

confidence: 99%