Banca de DEFESA: HUGO RAFAEL GONÇALVES CAVALCANTE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : HUGO RAFAEL GONÇALVES CAVALCANTE
DATA : 16/02/2018
HORA: 09:30
LOCAL: Auditório do NPITI
TÍTULO:

Acquisition of frequency in low-orbit satellite by maximum correntropy criterion.

PALAVRAS-CHAVES:

Doppler effect, Impulsive noise, maximum correntropy criterion

PÁGINAS: 80
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
RESUMO:

Low-earth orbit (LEO) satellites move at very high speeds and can circumscribe the planet several times in a single day. These high dynamics environments induce considerable Doppler shift and Doppler rate values in spatial communications signals, which is known as dynamic Doppler shift. Establishing communication with these systems is a multi-task process and, due to the dynamic Doppler shift, a critical task is the fine acquisition of the carrier frequency. Several studies have investigated frequency estimation techniques of satellite signals, considering communication environments characterized by additive white Gaussian noise (AWGN). However, the effects of impulsive noise should also be considered in a more accurate characterization of the LEO satellite communication scenario. This work introduces a new method of frequency acquisition for low-orbit satellites based on similarity calculus by maximum correntropy criterion. Due to some of its properties, correntropy is very efficient in the processing of non-Gaussian signals, especially in impulsive noise environments. It was investigated the robustness of the technique proposed in this work on a communication environment characterized by impulsive noise, and compare its performance with that obtained by a classical approach, based on the correlation coefficient. The carrier frequency acquisition method for LEO satellites proposed in this work can be used in the development of a decoder for signals from the Brazilian Environmental Data Collection System (SBCDA) and Franco-American Envi-ronmental Data Collection System (ARGOS).

MEMBROS DA BANCA:
Presidente - 1543191 - LUIZ FELIPE DE QUEIROZ SILVEIRA
Interno - 1673543 - SAMUEL XAVIER DE SOUZA
Externo à Instituição - ALUISIO IGOR REGO FONTES - IFRN
Externo à Instituição - JOSE MARCELO LIMA DUARTE - INPE