Implementación de un sistema de recepción satelital para el riego automatizado de uso agrícola basado sobre SDR.

Abstract

An estimate of water needs in crops was developed, based on the information obtained by the meteorological satellite of the National Oceanic and Atmospheric Administration (NOAA). The project was executed in the Tunshi experimental station belonging to the Escuela Superior Politécnica de Chimborazo, which did not have an irrigation system assisted by satellite images, therefore one is proposed; this, through the analysis and decoding of the signal in image format acquired from meteorological satellites for its later storage and publication, thus establish the wáter needs of the plantation for the implementation of the automated irrigation sistema controlled from Android applications. To improve the satellite tracking time, an automatic positioning control system was designed for the Double Cross antenna, based on the acquisition of satellite coverage information and predictions, for which a control of the azimuth angles is established and elevation controlled with Arduino using a digital compass. Step-by-step motors and a design of 3d printed gears were implemented for the real-time location of the satellite antenna. An increase of 44.44% in the satellite reception time was established when implementing the positioning system. The results indicated that, when using the corn crop as reference, it was generated a percentage variation from 5 to 10% between the estimated and the observed value, therefore the APT images of the NOAA 18 are valid for the evapotranspiration analysis, but at the Regional level. It is recommended for future work to use satellites with higher spatial resolution.