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Spectral transformation-based technique for reducing effect of limited pre-correlation bandwidth in the GNSS receiver filter in presence of noise and multipath

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Journal of Systems Engineering and Electronics 2020年第2期31卷 252-265页

作者： TITOUNI Salem ROUABAH Khaled atia salim FLISSI Mustapha MEZAACHE Salaheddine BOUHLEL Mohamed salim Electronics and Advanced Telecommunications Laboratory of Electronics Department University of Mohamed El Bachir El IbrahimiBordj Bou Arreridj 34031Algeria Sciences of Electronics Technologies of Information and Telecommunications Research UnitHigher Institute of Biotechnology of SfaxSfax 3038Tunisia

This paper proposes an efficient scheme to reduce the pre-correlation bandwidth effect in the global navigation satellite system(GNSS)receiver filtering *** is mainly based on the application of a spectral transformation to the satellite-emitted signal that effectively reduces its *** the receiver's end,this operation causes the spreading of noise over a much wider band than that used by the radio frequency ***,the resulting auto-correlation function in the acquisition process acquires properties that enhance considerably the performance of the receiver in the presence of the multipath and noise disturbing *** simulation results demonstrate that the proposed method is a plausible solution for both multipath and noise problems in the GNSS applications for any limited value of the pre-correlation bandwidth in the receiver filter.

关键词： precorrelation bandwidth spectral transformation multipath noise

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GNSS Multipath Reduction Using GPS and DGPS in the Real Case

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Positioning 2017年第4期8卷 47-56页

作者： Salem Titouni Khaled Rouabah salim atia Mustapha Flissi Oussama Khababa Electronics Department ETA Laboratory University of Mohamed El-Bachir El-Ibrahimi Bordj Bou Arreridj Algeria Engineering Office & Technical Studies Bordj Bou Arreridj Algeria

In Global Navigation Satellite System (GNSS) like Global Positioning System (GPS) and future Galileo, space signal reception in urban environment seems to be one of most significant. The urban environment is characterized by the presence of an excessive number of obstacles that produce Multiple Path (MP) in positioning the receiver. Consequently, it is of primary importance to characterize and ameliorate the performances of GNSS receiver for this type of application. In this paper, a method to mitigate MP in GNSS applications was proposed. Its principle is based on the addition, to the geographic map of a city or a neighborhood, of a supplementary information that consists of the correction of error caused by the MPs. The latter one was carried out by the comparison of the measurements, realized by Differential GPS (DGPS) and GPS, between two different sites with the same form. The first one was characterized by the presence of the MPs and the second one was completely clear of any type of obstacle. As a consequence, the measurements comparison has allowed us to deduce the GNSS MPs errors. This information can subsequently be used to make the corrections of the errors caused by MPs and it can be generalized by a measurement company to any entire city in order to identify errors in any neighborhood.

关键词： GNSS GPS DGPS Multipath

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Mathematical Model of Non-Coherent-DLL Discriminator Output and Multipath Envelope Error for BOC (α, β) Modulated Signals

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Positioning 2013年第1期4卷 65-79页

作者： Khaled Rouabah Chebir Saifeddine salim atia Mustapha Flissi Djamel Chikouche Electronics Department LMSE Laboratory University of Mohamed El-Bachir El-Ibrahimi Bordj Bou Arréridj Algeria Electronis Department LIS Laboratory University of M’sila M’sila Algeria

In this paper we propose the derivation of the expressions for the non-coherent Delay Locked Loop (DLL) Discriminator Curve (DC) in the absence and presence of Multipath (MP). Also derived, are the expressions of MP tracking errors in non-coherent configuration. The proposed models are valid for all Binary Offset Carrier (BOC) modulated signals in Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS) and Future Galileo. The non-coherent configuration is used whenever the phase of the received signal cannot be estimated and thus cannot be demodulated. Therefore, the signal must be treated in a transposed band by the non-coherent DLL. The computer implementations show that the proposed models coincide with the numerical ones.

关键词： BOC Modulation GNSS PRN Code Multipath Discriminator Envelope Error

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