Resource-efficient acquisition architecture for BOC-modulated signals

Lei, Dengyun; Lu, Weijun; Yu, Dunshan

doi:10.1587/elex.11.20140358

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Step 5: According to the formula (15), the final algorithm operation is performed to obtain a correlation function without a sub-peak, that is, the detection value V.…”

Section: The Acquisition Structure Diagrammentioning

confidence: 99%

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Unambiguous Acquisition/Tracking Technique Based on Sub-Correlation Functions for GNSS Sine-BOC Signals

Fang

Gan

et al. 2020

Sensors

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The autocorrelation function (ACF) of the Binary Offset Carrier modulation (BOC) signal for Global Navigation Satellite System (GNSS) has multiple peaks, ambiguity is easily generated during the synchronization of the baseband signal. Some methods have been proposed to remove the ambiguity, but the performance is not suitable for high-order BOC signals or does not maintain narrow correlation characteristics. This paper proposes a sub-function reconstruction synchronization algorithm to solve this problem, of which the key is to design a new local auxiliary code: the local Pseudo-Random Noise (PRN) code is divided into several new codes with different delays. The auxiliary code performs a coherent integration operation with the received signal. Then, a correlation function without any positive side peaks is obtained by multiplying the two correlation results to make the acquisition/tracking completely unambiguous. The paper gives a design scheme of navigation signal acquisition/tracking and deduces the theoretical analysis of detection performance. The phase discrimination function is provided. The performance of the method is analyzed from both theoretical and simulation aspects. Compared with the Binary phase shift keying-like (BPSK-LIKE) method, Subcarrier Phase Cancellation (SCPC) method and the Autocorrelation Side-Peak Cancellation Technique (ASPeCT) method, the proposed method has the best detection probability for the acquisition, which is 0.5 dB-Hz better than ASPeCT. For tracking, the proposed method performs best in terms of phase-detection curve, anti-multipath performance, and anti-noise performance. For high-order BOC signals, the SRSA technique successfully removes the false lock points, and there is only one multipath error envelope, and the code tracking error is almost the same as the ASPeCT method.

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“…Step 5: According to the formula (15), the final algorithm operation is performed to obtain a correlation function without a sub-peak, that is, the detection value V.…”

Section: The Acquisition Structure Diagrammentioning

confidence: 99%

“…Using the first and the M-th sub-PRN codes as two local auxiliary codes in the tracking loop. Without considering multipath and interference, the BOC IF signal received by a GNSS receiver from a satellite can be expressed as [15]:…”

Section: Discriminator Function and Tracking Loop Structurementioning

confidence: 99%

Unambiguous Acquisition/Tracking Technique Based on Sub-Correlation Functions for GNSS Sine-BOC Signals

Fang

Gan

et al. 2020

Sensors

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“…Since the integration in the first step isolates the code phase and subcarrier phase correlation, time division technology can be adopted to decrease hardware cost [7]. At the same CPU frequency, the hardware reuse ratio of proposed scheme to direct implementation is L (L >1).…”

Section: Proposed Schemementioning

confidence: 99%

An Efficient Acquisition Architecture for BOC-modulated Signal

Lei¹,

Yu³

2015

Proceedings of the 2015 International Industrial Informatics and Computer Engineering Conference

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Due to large search space and multiple peaks of autocorrelation function, fast acquisition of BOC-modulated GNSS signal is a time and resource consuming task. In this paper, a novel hardware architecture for BOC-modulated signal acquisition is proposed. The proposed architecture adopts sub carrier phase cancellation method to remove multiple peaks. By rearranging the correlation order and adopting time division technology, the proposed architecture reduces the hardware cost. Compared with the traditional structures, experimental results show that the number of adders is reduced by 75%.

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“…Currently, the solutions to tackle the ambiguity problem have been highly focused on by many researchers, and some interesting approaches can be summed up in the following three categories: single sideband algorithm [ 10 , 11 ], ambiguity avoidance detection method [ 12 , 13 ] and side-peaks cancellation (SC) [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. (1) The BPSK-like [ 10 ] and modified sideband (MSB) [ 11 ] technique are two representative single-sideband algorithms, both of which use band-pass filters to deal BOC signals to obtain two side lobes.…”

Section: Introductionmentioning

confidence: 99%

“…General removing ambiguity via side peak suppression (GRASS) technology [ 19 ] is a generalized ambiguity-free capture algorithm proposed for sine-BOC signals, but at the expense of the narrow correlation characteristics of BOC signals. On this basis, [ 20 , 21 ] improved the method, respectively, but the common shortcoming of these two methods is that the edge peak elimination is not thorough enough, and that used in [ 21 ] is only suitable for cosine-BOC signals of an even modulation order.…”

Section: Introductionmentioning

confidence: 99%

An Unambiguous Synchronization Scheme for GNSS BOC Signals Based on Reconstructed Correlation Function

Sun

Song

et al. 2021

Sensors

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Binary offset carrier (BOC) modulation is a new modulation method that has been gradually applied to the Global Satellite Navigation System (GNSS) in recent years. However, due to the multi-peaks in its auto-correlation function (ACF), it will incur a false lock and generate synchronization ambiguous potentially. In this paper, an unambiguous synchronization method based on a reconstructed correlation function is proposed to solve the ambiguity problem. First, through the shape code vector constructed in this paper, the general cross-correlation function (CCF) expression of the BOC modulated signal will be obtained. Based on the features of the signal correlation function, it is decomposed into a matrix form of trigonometric functions. Then, it generates two local signal waves using a specific method, then the proposed method is implemented to obtain a no-side-peak correlation function by reconstructing the cross-correlation between the received signal and the two local signals. Simulations showed that it fully eliminates the side-peak threat and significantly removes the ambiguity during the synchronization of the BOC signals. This paper also gives the improved structure of acquisition and tracking. The detailed theoretical deduction of detection probability and code tracking error is demonstrated, and the corresponding phase discrimination function is given. In terms of de-blurring ability and detection probability performance, the proposed method outperformed other conventional approaches. The tracking performance was superior to the comparison methods and the phase discrimination curve only had a zero-crossing, which successfully removed the false lock points. In addition, in multipath mitigation, it outperformed the ACF of the BOC signal, and performs as well as the autocorrelation side-peak cancellation technique (ASPeCT) for BOC(kn,n) signals.

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Resource-efficient acquisition architecture for BOC-modulated signals

Cited by 5 publications

References 4 publications

Unambiguous Acquisition/Tracking Technique Based on Sub-Correlation Functions for GNSS Sine-BOC Signals

Unambiguous Acquisition/Tracking Technique Based on Sub-Correlation Functions for GNSS Sine-BOC Signals

An Efficient Acquisition Architecture for BOC-modulated Signal

An Unambiguous Synchronization Scheme for GNSS BOC Signals Based on Reconstructed Correlation Function

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