Teste de um receptor em UHF para coleta de dados de sensores por satélite

Abstract

This master’s thesis presents a test plan, the automation system for carrying out the experiments and the results obtained from the Environmental Data Collector (EDC), UHF receiver for collecting data from satellite sensors. The parameters tested were: bandwidth, linearity, spurious, noise figure and performance of the decoding the received signals. The EDC will act in the space segment of the Brazilian Environmental Data Collection System (SBCDA), a system for message forwarding through satellite.. For over twenty years, the SBCDA has provided data for various researches and environment monitoring activities. However, the SBDCA needs an update to its space segment. The Institute National Space Research Institute is developing a constellation of nanosatellites from the CubeSat standard to replace the current SBCDA satellites. The EDC will be the payload of these new SBCDA nanosatellites. To validate the EDC, a test plan was prepared which aims to assess whether the prototype built is in accordance with the desired specifications. To carry out the tests, a bench equipped with a computer, equipped with a testing software, signal generator, a voltage source and a Arduino. A spectral analysis, from the digitized signal, was used for testing the RF-Front-End and the Frame Error Rate was used to validate the capacity of the EDC to decode incoming messages. The EDC prototype was approved with based on the results obtained, however, some corrections were suggested.