PROBLEM OF THE USE OF DUAL-FREQUENCY GNSS RECEIVERS IN BENIN

Abstract

Despite several approaches, Benin has always had difficulties in securing land. Among the causes of this insecurity are technical reasons, which are either related to the working methods or to the tools used. To overcome these difficulties, a good number of surveyors nowadays are increasingly equipped with the latest generation tools that are dual-frequency GPS / GNSS receivers for an efficient execution of works. Indeed, according to the standards and the technical and administrative requirements, all these works should be in a single system, the National Geodetic Network which is that of the permanent stations. The objective is to evaluate not only the statistics of effective use of GPS / GNSS bi-frequency receivers in surveying and mapping work in Benin but also to study the observation modes used by the users of the GPS / GNSS receivers. The present study has allowed us to show the limits of the attachment methods commonly used by users of these GPS / GNSS receivers, and then to propose a procedure manual for the one hand the execution of the topographic survey works in RTK mode with pivot free of charge and, on the other hand, to ensure a better connection of the topographical work carried out to the system of the network of permanent stations.