Análise comparativa de dados tomados a partir do Sistema de Posicionamento Global (GPS) utilizando a correção diferencial

Abstract

The needs of modern society coupled with the accelerated growth of electronic technology have led to the development of various positioning systems. The application of GPS - Global Positioning System, is seen in several fields of action such as topography, agronomy, forest survey among others. However, some variables govern the accuracy of the GPS system, such as the time spent on the measurements, the type of receiver and the relative position of the satellites. Thus, from the differential correction technique, it is possible to achieve a precision of centimeters in the measurements. The objective of this work is to establish the contact with the GPS device, its practical application and use techniques, thus making an analysis about the differential correction in the Global Positioning System (GPS) from fixed stations of IBGE, Santiago & Cintra and INCRA. The present work was developed in Sítio Nova Esperança, located in the municipality of Feira de Santana, State of Bahia, whose geographic coordinates are 12o 18'42 '' south latitud and 38o56'48''W longitud and average altitud of 215m. With the GPS device, data were collected by area, by points and by line, and the analysis of the corrections obtained was performed. The INCRA and IBGE stations presented close results while Santiago & Cintra presented different results. In addition, a difference was observed between field data and GPS data. Thus, it is concluded that the use of the differential correction leads to a better standardization of the data, promoting the correction of deviations.