Positioning, 2017, 8, 47-56 http://www.scirp.org/journal/pos ISSN Online: 2150-8526 ISSN Print: 2150-850X DOI: 10.4236/pos.2017.84004 Oct. 13, 2017 47 Positioning GNSS Multipath Reduction Using GPS and DGPS in the Real Case Salem Titouni 1 , Khaled Rouabah 1 , Salim Atia 1 , Mustapha Flissi 1 , Oussama Khababa 2 1 Electronics Department, ETA Laboratory, University of Mohamed El-Bachir El-Ibrahimi, Bordj Bou Arreridj, Algeria 2 Engineering Office & Technical Studies, Bordj Bou Arreridj, Algeria Abstract 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 cha- racterize 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 cha- racterized 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 subse- quently 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. Keywords GNSS, GPS, DGPS, Multipath 1. Introduction The first stage realized in a GNSS receiver consists of visible satellites acquisi- tion, as well as a coarse estimate of signal in space (SIS) parameters correspond- ing to each satellite of the constellation [1]. This operation is accomplished by a How to cite this paper: Titouni, S., Roua- bah, K., Atia, S., Flissi, M. and Khababa, O. (2017) GNSS Multipath Reduction Using GPS and DGPS in the Real Case. Position- ing, 8, 47-56. https://doi.org/10.4236/pos.2017.84004 Received: August 17, 2017 Accepted: October 10, 2017 Published: October 13, 2017 Copyright © 2017 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access