@InProceedings{MagalhãesPFMMOAJ:2009:SeMoSi,
               author = "Magalh{\~a}es, Nadja S. and Pires, Ricardo and Frajuca, Carlos 
                         and Melo, Rafael F. and Marinho J{\'u}nior, Rubens M. and 
                         Oliveria, Fernanda G. and Aguiar, Odylio Denys and Johson, Warren 
                         W.",
          affiliation = "UNIFESP and IFSP and IFSP and IFSP and ITA and ITA and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and LSU",
                title = "Searching for Monochromatic Signals in Gravitational Wave 
                         Detection",
                 year = "2009",
         organization = "Encontro Nacional de F{\'{\i}}sica de Part{\'{\i}}culas e 
                         Campos, 30.",
             abstract = "This work focus on the detection of continuous gravitational wave 
                         signals. A new data analysis is proposed based on a method 
                         tailored for the detection of monochromatic signals in the middle 
                         of strong, white noise. Known in the literature as the Welch 
                         method, it basically makes power spectrum estimates using averaged 
                         modified periodograms. The averaging procedure reduces white 
                         noise, which is random, while evidencing monochromatic signals. 
                         Therefore, by using this method it is possible to obtain a power 
                         spectrum for the data which preserves peaks due to monochromatic 
                         signals. Then an analysis is performed on persistent peaks, 
                         searching for frequency drifts that might present a pattern 
                         similar to the one due to Doppler shifts. In gravitational wave 
                         detection two kinds of Doppler shifts are expected, with annual 
                         and daily periods. For the chosen data set of the ALLEGRO 
                         gravitational wave detector it was found that none of the 
                         strongest, persistent peaks investigated presented a frequency 
                         drift with a Doppler shift pattern, thus excluding them as 
                         gravitational wave signal candidates. The method proved useful 
                         even for very noisy data, by minimizing the noise to levels much 
                         inferior to the monochromatic signal ones and allowing the Doppler 
                         shift analysis. It can be used with interferometric detectors as 
                         well.",
  conference-location = "Passa Quatro, MG",
      conference-year = "14-18 set.",
        urlaccessdate = "28 abr. 2024"
}