Consistent BCS modulated signals for GNSS applications

Flissi, Mustapha; Rouabah, Khaled; Attia, Salim; Chikouche, Djamel; Devers, Thierry

doi:10.1049/iet-spr.2016.0200

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…BOC s / c ( m , n ) signals CFs depend, in particular, on the subcarrier parameters such as M and

T_{s c}

, as given by the following expression [8–31]:…”

Section: Bocs /C (M N) Modulationsmentioning

confidence: 99%

“…Several methods have been proposed in the literature to overcome this problem. The most popular are those built on the basis of the CFs of BOC s / c signals [5–8] such as the autocorrelation function side‐peak cancellation technique (ASPCT) [5]. ASPCT method is based on the combination of two CFs and it is limited to BOC s ( n , n ) modulated signals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient technique for DLL S ‐curve side zero‐crossings cancellation in global positioning system/Galileo receiver

Rouabah

Atia

Flissi

et al. 2019

IET signal process.

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In this study, the authors propose a new method that eliminates ambiguity in global navigation satellite system (GNSS) code acquisition and tracking significantly. It is based on the use of a specified locally generated (SLG) pseudo‐random noise code that can be correlated with any received binary offset carrier sine‐ or cosine‐modulated signal. As a result, the correlation function (CF) together with its discriminator function (DF) at the delay locked loop (DLL) output, determined within a tracking region of (−1, 1) chips, are unambiguous and narrow, providing thus better positioning accuracy. On the other hand, the SLG‐based methods CF and DF are such as those of high‐resolution correlator and Strobe correlator, initially proposed for multipath mitigation in classical binary phase shift keying‐modulated code. In addition, their proposed SLG‐based scheme is valid for any value of the early–late chip spacing in the DLL‐DF. The computer simulation results show that the proposed scheme is unambiguous for DLL code‐tracking operation and has superior performance in the estimation of the delay of line of sight signal in GNSS applications.

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“…BOC s / c ( m , n ) signals CFs depend, in particular, on the subcarrier parameters such as M and

T_{s c}

, as given by the following expression [8–31]:…”

Section: Bocs /C (M N) Modulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient technique for DLL S ‐curve side zero‐crossings cancellation in global positioning system/Galileo receiver

Rouabah

Atia

Flissi

et al. 2019

IET signal process.

Self Cite

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show abstract

“…In Global Navigation Satellite System (GNSS) applications, the subcarrier introduced in binary offset carrier (BOC) modulations and used as a part of the signal code permits to use efficiently the allocated frequency bands and to improve, at the same time, the acquisition and tracking performances in presence of noise, multipath (MP), and narrowband interferences . However, these modulations are limited by the ambiguity problem in the acquisition and tracking processes caused by the presence of multiple zero‐crossing points in the discriminator function (DF) at the output of the delay‐locked loop (DLL) especially in unfavorable environment .…”

Section: Introductionmentioning

confidence: 99%

Unambiguous method for DLL BOC signals tracking

Feneniche

Rouabah

Flissi

et al. 2020

Int J Communication

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In this paper, we propose an efficient method for eliminating ambiguity in the acquisition and tracking processes of binary offset carrier (BOC)-modulated signals. Our contribution is realized in two stages. The first one is based on the use, at the receiver end, of optimized locally generated subcarrier sequences to get a completely unambiguous composite correlation function (CF). This first stage is used to initialize and control the second stage of the proposed method designed on the basis of a maximum likelihood algorithm (MLA) to mitigate, specifically, multipath (MP) effect. In fact, the idea is to combine, in this second stage, the received signal (affected by noise and MP) with a set of locally generated ideal BOC(m,n)-modulated signals, which are delayed and weighted by the MLA-estimated parameters of delays, amplitudes, and phases of all the MP signals, to obtain an unambiguous CF with better performance. The simulation results, based on MATLAB tool, have demonstrated that the proposed method effectively eliminates the ambiguity problem. Besides, a comparative study with several methods has shown that the proposed method grants better performance than the most popular techniques. K E Y W O R D S

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“…BOC-AW and OBOC-AW waveforms present better resistance to noise, jamming and interferences, compared to the traditional BOC and BCS ones for the same receiving band [8]. Newly, consistent BCS modulation sequences are proposed in [9] providing high performance in terms of code tracking efficiency, and interference and MP mitigation.…”

Section: Introductionmentioning

confidence: 99%