A New GNSS Synchronization Scheme

Kim, Sanghun; Chong, Dahae; Yoon, Seokho

doi:10.1109/vetecs.2009.5073312

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Side-Peak Cancellation Technique (SPCT) [16,17]. The essence of SPCT is to remove the side-peaks of BOC auto-correlation function since they are the origin of the false lock tracking points.…”

Section: Ambiguous Problem For Boc Signalsmentioning

confidence: 99%

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Unambiguous Synchronization Scheme for GNSS BOC(n,n) Signals

Qi¹,

Chen²,

Geng³

2014

JNW

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Galileo and Modernized GPS have included in their signal structures a new signal modulation: the Binary Offset Carrier (BOC), which multiplies a spreading code with a square wave sub-carrier. It creates a split spectrum with two main lobes shifted from the center frequency by sub-carrier. This modulated signal induces better tracking in white noise and better inherent multipath mitigation compared to the spreading code alone. However, it also makes acquisition more challenging and tracking potentially ambiguous due to its multiple peak autocorrelation function. This paper, instead of trying to find a generic solution, focuses on a specific BOC signal: the BOC(n,n). A novel tracking technique dedicated to BOC(n,n) signals has been developed by using a synthesized local cross correlation function between received BOC signal and local PRN. It completely removes the side-peak threating. Simulation results show that the combined tracking loops can eliminate false lock points. It also reduces the standard tracking deviation error and slightly degrade its probability of detection compared with the standard tracking algorithm.

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Section: Ambiguous Problem For Boc Signalsmentioning

confidence: 99%

“…In order to compared with another method proposed in [16] by Korea, its combined correlation function was also drawn in Fig. 3.…”

Section: Proposed Correlation Functionmentioning

confidence: 99%

Unambiguous Synchronization Scheme for GNSS BOC(n,n) Signals

Qi¹,

Chen²,

Geng³

2014

JNW

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“…In Sharp Reconstruction (RS) [9] algorithm, the relation result is folded by fractal reconstruction to eliminate ambiguity, but the acquisition accuracy is declined caused by its wide main lobe. In Sub-Correlation Function (SCF) [10] algorithm, multiple kinds of local BOC signals are correlated with the received BOC signal, and a correlation function without side peaks is obtained, but it adopts the combination of multiplication so that the calculation is large. Typical frequency domain algorithms are as follows: BPSK-like [11]- [13] method is similar to the way of processing binary phase shift key (BPSK) signal, which treats BOC signal as the sum of two BPSK signals with different carrier frequencies, but it loses the advantage of high precision.…”

Section: Introductionmentioning

confidence: 99%

A Novel Acquisition Algorithm Based on PMF-apFFT for BOC Modulated Signals

Pan

Zhang

et al. 2019

IEEE Access

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Large Doppler shifts are inherent to high-speed relative motion between receiver and satellite and are likely to cause major problems during the code phase acquisition due to the introduced frequency ambiguity. In order to solve the problem of acquisition for the binary offset carrier (BOC) modulated the signal with large Doppler shift, a novel acquisition algorithm based on partial matched filter-all phase fast Fourier transform (PMF-apFFT) is proposed in this paper. In this method, all phase processing was adopted to weaken the effect of spectrum leakage after partial correlation, and two dimensional parallel searching for Doppler frequency on different code phases was completed by the maximum value after the cumulative average exceeding the threshold. The theoretical analysis and simulation results show that the correct code phase search and high precision estimation of Doppler frequency can be completed by the proposed algorithm at the same time. Compared with the traditional PMF-FFT acquisition algorithm, the proposed algorithm has stronger anti-noise performance and a better detection probability, and it is suitable for the complex communication environment of strong noise and large Doppler shift.INDEX TERMS Partial matched filter-all phase fast Fourier transform (PMF-apFFT), binary offset carrier (BOC) signal, acquisition, large Doppler shift.

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A novel acquisition algorithm based on two-dimensional delay estimation for BOC signals

Pan

Zhang

et al. 2019

Physical Communication

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A New GNSS Synchronization Scheme

Cited by 6 publications

References 5 publications

Unambiguous Synchronization Scheme for GNSS BOC(n,n) Signals

Unambiguous Synchronization Scheme for GNSS BOC(n,n) Signals

A Novel Acquisition Algorithm Based on PMF-apFFT for BOC Modulated Signals

A novel acquisition algorithm based on two-dimensional delay estimation for BOC signals

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