1. Instituto Nacional de Pesquisas Espaciais; São José dos Campos, São Paulo Brazil
2. Center for Atmospheric and Space Sciences; Utah State University; Logan Utah USA
3. Electrical and Computer Engineering Department; Duke University; Durham North Carolina USA
4. Department of Electrical and Computer Engineering; Digipen Institute of Technology; Redmond Washington USA
5. Southern Regional Space Research Center, CRS, INPE-MCT; Santa Maria, Rio Grande do Sul Brazil