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

Fang, Hao; Yu, Baoguo; Gan, Xingli; Jia, Ruicai; Zhang, Heng; Lu, Haojie; Wang, Boyuan

doi:10.3390/s20020485

Cited by 15 publications

(15 citation statements)

References 25 publications

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“…These non-negligible sidelobe peaks can cause false detection and false locks in the low signal-to-noise ratio (SNR) [ 42 ]. The implementation complexity of algorithms proposed to avoid the false detection and lock problem depends on the shape of the autocorrelation function of the desired signal [ 46 , 47 , 48 , 49 ]. The higher the sidelobe peaks, the more complex algorithms are required.…”

Section: Navigation Signal Design Considerationsmentioning

confidence: 99%

A Comprehensive Evaluation of Possible RNSS Signals in the S-Band for the KPS

Han

Lee

You

et al. 2022

Sensors

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Recently, the Korean government has announced a plan to develop a satellite-based navigation system called the Korean Positioning System (KPS). When designing a new Radio Navigation Satellite Service (RNSS) signal, the use of the S-band has emerged as an alternative to avoiding signal congestion in the L-bands, and South Korea is considering using the S-band with the L-bands. Therefore, this study proposed possible S-band signal candidates and evaluated their performance, such as the radio frequency (RF) compatibility, spectral efficiency, ranging performance, and receiver complexity. Several figures-of-merit (FoMs) were introduced for quantitative performance evaluation for each candidate. Each FoM was calculated using an analytical equation by considering the signal design parameters, such as the center frequency, modulation scheme, and chip rate. The results showed that the outstanding candidate signal was different depending on the signal performance of interest and the reception environments. Therefore, we discuss and summarize the signal performance analysis results considering the whole FoMs together. Under the assumptions given in this paper, the binary phase shift keying (BPSK)(1), sine-phased binary offset carrier (BOCs)(5,2), and BPSK signals were superior for the spectral efficiency, ranging performance, and receiver complexity, respectively.

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Section: Navigation Signal Design Considerationsmentioning

confidence: 99%

A Comprehensive Evaluation of Possible RNSS Signals in the S-Band for the KPS

Han

Lee

You

et al. 2022

Sensors

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“…where P i is expressed as Equation (16). Based on Equations (13)- (16), the value of the P can be computed via Monte Carlo simulation, and the result is shown as Figure 3.…”

Section: Acquisition Decisionmentioning

confidence: 99%

“…Since the sine-BOC (1,1) (sBOC(1,1)) modulation is widely used for new civil GNSS signals such as GPS L1C, Galileo E1, and BDS-3 B1C, unambiguous acquisition of sBOC(1,1) signals becomes a challenging issue for an MCC GNSS acquisition scheme. Many methods were proposed in the past decades [15][16][17]: BPSK-like [18], SCPC [19], ASPeCT [20], GRASS [21], PUDLL [22], SRSA [16], and SEA [17]. On the one hand, these methods all require extra specific system designs or reconstructed auxiliary signals, which increase the complexity of the acquisition scheme.…”

Section: Introductionmentioning

confidence: 99%

An innovative FPGA‐based low‐complexity and multi‐constellations compatible GNSS acquisition scheme

Qiu

Wang

et al. 2021

IET Radar Sonar & Navi

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There is a strong demand for the multi-constellations compatible Global Navigation Satellite System (GNSS) acquisition scheme, since it is able to acquire signals from different constellations to increase availability of satellites. However, the presence of multiple modulation modes and diverse Pseudo-Random-Noise (PRN) code lengths makes the design challenging. Moreover, existing schemes consume a lot of hardware resources. Hence, we present an innovative Field Programmable Gate Array (FPGA)-based lowcomplexity and multi-constellation compatible GNSS acquisition scheme to provide a solution for the above-mentioned challenges. This scheme is based on the proposed Improved Serial-Parallel Matched Filter structure that not only requires less hardware resources than conventional structures but also performs all operations in a pipeline to simplify the implementation in FPGA. Additionally, the maximum likelihood criterion is used to obtain decision statistics, which ensures the compatibility between BPSK and sBOC (1,1) signals. Furthermore, a three-step method to acquire signals with a long PRN code is proposed. This also guarantees the compatibility among signals with different PRN code lengths. Finally, a new aided acquisition method to accelerate the acquisition process of signals with a long PRN code is proposed. Experimental results show this scheme is capable of acquiring multi-constellations civil GNSS signals, and therefore it has high practical value. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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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%

“…The pseudo-correlation function (PCF) technology mentioned in [ 16 ] eliminates the edge peaks of the correlation function by constructing two sets of spreading code sequence waveforms that are mirror images of each other, and then combining them non-linearly. The method in [ 17 , 18 ] is only dedicated to Sine-BOC signals. 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.…”

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

Cited by 15 publications

References 25 publications

A Comprehensive Evaluation of Possible RNSS Signals in the S-Band for the KPS

A Comprehensive Evaluation of Possible RNSS Signals in the S-Band for the KPS

An innovative FPGA‐based low‐complexity and multi‐constellations compatible GNSS acquisition scheme

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

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